Chevy / GMC Truck: Crank No Start No Communication With FPCM

[@hammerhead6537]

I think it is obvious the vehicle industry is dead set on eliminating the independent shops and the DIYer. But thank God for unselfish people like you and the many others that dedicate their time to teach people like me. They are over complicating everything according to their agenda, it is a plan. GREED. Thanks a million for your time and effort.

[@12volttech5]

The first 21 mins of this U0109 crank no start diagnostics is on point, After that Eric overworked himself. I believe the easier way to check if the fuel pump is the issue would have been to jump the pins for the fuel pump to power and ground on the same harness, Without plugging the harness back into the FPCM. If the fuse pops the problem is either the fuel pump or a short in the wires going to the pump, If the fuse does not pop then the problem is a internal short in the FPCM. Great job with the videos keep them coming.

[@Krillekris]

So sweet of your wife to tell that she has a good life with you Eric O. It warmed my heart :-)

[@Thumper79]

I have to say that if I lived in New York state, and I needed a good mechanic you would be the first person I'd come to. That's how much you impressed me with your videos.

[@baxrok2.]

Wow, watching you diagnose things is just awesome. It's not just the diagnosis, but the fact that you do it quickly, and confirm it 100%. Amazing. Thanks for educating and informing us. Most of all though, thanks for sharing this!

[@mechantics]

If I ran a shop, the "waiting room" would have a television streaming South Main Auto nonstop; first off, it'd help give the customer some impartial insight regarding the extent of a given repair. That, and when I was under the car watching the same video, they'd be less likely to notice🤫

[@mauricioalfonso8521]

you probably dont give a damn but does someone know a trick to get back into an instagram account..? I was stupid lost the account password. I appreciate any help you can give me!

[@chrisbronson5860]

@Mauricio Alfonso Instablaster :)

[@mauricioalfonso8521]

@Chris Bronson thanks for your reply. I found the site through google and im waiting for the hacking stuff atm. Takes a while so I will reply here later when my account password hopefully is recovered.

[@mauricioalfonso8521]

@Chris Bronson it did the trick and I now got access to my account again. Im so happy:D Thank you so much you saved my account !

[@mindtouchone]

When I retired I has 2 ASE Master certificates and every certifications Ford offered, and more and I'm saying this man is GOOD, or as a friend says "good at it!" Anybody in his area needs to take their problems to him. As to prices, people need to understand that it takes a lot to operate a business like his. The money for tools alone is high and a good scanner alone can cost 10k, or more plus there' are more and more tools needed including special tools that may be needed to work on a certain brand of vehicle. On top of that the overhead in NY is astronomical. A good tech like this man is worth top dollar.

[@PaulHigginbothamSr]

You better believe he is good. Even car companies send their non-functs to him. He is so good I wish he lived near me. Why? Because he is honest. I am sure he has failures but not sure I have seen that come up. His car probably runs like crap that is the way it works

[@toddmcclary2820]

The shop rental alone will keep you up at night not to mention heat electricity etc.

[@Leonarco333]

Especially knowing he is honest and up front about it. It’s sad to say that that is getting more rare.

[@JamesSmith-xs7sr]

Knewa dude that has 6 of those same "doublecerts"! Tip of the cap sir.

[@tomoakhill8825]

The thing I like best about these videos is the comment made by Mrs O. at 39:50 "I do have it good, 'cos I married you". Those of us in happy marriages, really enjoy seeing other couples who also love each other. I notice the negative comments from those who have never experienced a marriage like this one. People actually do feel this way about each other.

[@LayZeeDawg]

Thanks for this Mr. O, every video you put up of burned up modules and electronicals makes me want to forget buying anything newer than 25 years old. Control modules, reprogramming, how about relays and fuse boxes? Sounds like just more reasons for the manufacturer to make more money with proprietary stuff by locking us into dealership repairs.

[@shorelinearmorllc477]

With great technology comes great responsibility

[@QuantumMind88]

You are a perfect combination between Eric The Car Guy and Scanner Danner. Very informative and fun to watch! Thank you for your excellent videos, they are very informative!

[@kellismith4329]

You gotta have rainman ray in there too, these guys are all solid technicians

[@Shay-it5mt]

I love it. Scanner Danner is the bomb and Eric the car guy also

[@JamesSmith-xs7sr]

He's the best..He worked on race cars, for 18 years!

[@forget-me-notlawncare9821]

Another informative video. As the owner of an 05 Silverado, I appreciate this one personally. Thanks for all the detail in troubleshooting that you provide for us all, as well as the needed reprogramming of the new control module.

[@38911bytefree]

Love how sealed the module was conseidering its location ... glad they dont make aircrafts

[@u.smarshallscommando5924]

👍

[@paulyboy1951]

I watch Pine Hollow auto diagnostics. It's amazing how you guys can track these problems down. It takes diagnostic equipment that most mechanics don't know how to use. You teach us a lot.

[@ethanpoole3443]

I don’t know if you are still following these comments or whether this was already explained somewhere in the 564 comments, but circuit breakers are not ideal substitutes for fuses, as you discovered, because thermal circuit breakers typically take much longer to trip than a fuse, especially in more marginal overloads (for example, drawing 30-50A on a 20A circuit) - even longer still in dead shorts if they do not also include a magnetic trip element. It takes time to heat the bimetallic spring in a thermal circuit breaker, much longer than it takes to melt the thin wire or metal strip in a sacrificial fuse. This extra time to clear the circuit means that wiring and circuit board traces, etc., can get very hot before the breaker trips even though their operating load ratings are identical...and sometimes they will wind up failing before the breaker can finally do its job. That is part of the reason, costs aside, why fuses are used extensively in vehicles since the wiring harnesses are usually of rather light gauge and not really suited to handling extended overloads without overheating. Ideally, instead of using resettable thermal circuit breakers your kit manufacturer ought to redesign to use resettable *electronic* circuit breakers that better mimic the time versus load characteristics of the fuse you are substituting it for as it would then afford the same degree of protection.

[@vincentgotter4669]

Have been watching pretty regularly, but the old stuff is always really good. I think both Eric and Mrs O are lucky.

[@tylerparker3024]

This is by far the best KZbin channel out there. Total quality no b.s. and extremely informative. Glad I found your channel for sure

[@lewiscornine7122]

As a retired mechanic of 45 years i worked on construction equipment and municipal equipment in N.J i would of loved to work with you you are a smart Son of a gun but i really think Misses O is your mentor!😁

[@wroomwroom2678]

One of the best shows on KZbin

[@DA-zi6eq]

Wroom Wroom HANDS DOWN!!!

[@toddster772008]

No disrespect to Eric the car guy, but I enjoy your stuff way more. I'm a new subscriber I haven't watch a lot of your videos but I really like the way you pay close attention to detail. Wrench on buddy👍up.

[@milfordcivic6755]

ETCG seems to have gotten away from the day to day grind of being a mechanic. No disrespect, but payola product review, product placement and Fairmont build vids aren't all that interesting anymore to me.

[@BloodStainedTear]

Ima fan I concur and I've pointed this out before ETCG is way to commercialized now it's all about that Fairmont and the sponsors

[@justinp8946]

toddster772008 I wish Eric made more " fixing it forward" vids

[@kevinwoodcock7578]

I personally don't think ETCG is half the mechanic Dr. O is. He's trying to make a living off of youtube and all the power to him for that. Eric spins wrenches for his money and we are all lucky that he has decided to take us along for the ride. Thanks Dr.O.

[@amer1337]

ETCG is a mechanic, but Dr. O is a tech.

[@robert1975031]

I can say that it's a smell you'll never forget. I have gotten quite a few electronic items, that "Quit working" once I take a whiff of it, and smell that.. the diagnosis is pretty easy.

[@kellismith4329]

Great spot for a fuel control module, thanks gm - I had the same issue with my spare several years ago I needed it out, spent quite awhile messing with it but luckily got it down. I decided that with that setup you don’t really have a spare anyway that you could access on the side of the road so it has lived in my garage ever since - it is a giant rust magnet under there

[@donerickson1954]

I Find myself wanting to move back to wisconsin more as I get older. Then I watch your videos and i'm all, nah i'm good. I hate rust.

[@TitanFallDeath666420]

Dr O fixes another Chevy patient and it will live another 10 years after this operation! GG Dr O.

[@adventureoflinkmk2]

One can only hope. It's no Toyota after all...

[@JamesAgans]

I can visualize a meeting in the GM boardroom: " Sir, we are getting a lot of complaints from dealers that they are not getting enough parts vannon work to sell the parts we are making in China" Ok, son, heres what we do: We design a truck with a fuel pump driver module with a connector with tiny pins that is prone to corrosion, mount it to an aluminum plate, attach it to a steel component, and locate it behind the rear wheel where salt spray will hit it" Wow, what a great Idea, now I see why you are the Boss" Oh, and while you are at it, make the spare tire so its lowering bracket rusts to the point where the driver cannot access the spare if they have a flat tire, that will help out my towing company. " Wow, you're a genius"!

[@furhawk]

Hey Eric you got it going on dude!! If my wife ever looked at me and said "I do have it good, cuz I married you" - - my mind would explode!! 😂 You got it good Mr. O!

[@frap6790]

Eric, you're a virtual mechanic-ing Dynamo! Thanks for all the videos, really enjoy them.

[@porkchop4604]

Eric your hard to find. I've told my 2 years of service mechanic nephew to watch and learn from you. Your the best!

[@AP9311]

wow, talking about same thing, Ivan did the same thing. he put silicone on the back of the module to seal it from moisture and road film etc. he applied sealant on the connections to further seal the connections to the module.

[@paul-gn1wq]

@ Eric O. and Josh Benny Hello, Im needing to do something like this for the blind zone alert modules on vehicle. How did this work out? Did he put silicone directly on the board? I've seen some apply nail polish to seal would this maybe work sir this type of application? What kind of sealant would be used on the connections to seal? Just a novice trying to keep vehicle on the road. I appreciate any and all help...Thank you.

[@jerryblood9554]

I was watching a video of a guy working on a module underneath a vehicle from Sacramento CA with 180000 miles. Couldn't believe it. No rust whatsoever. Looked like it came off the showroom floor. We in northern Illinois have the same problem as you. My 01 Ranger is dissolving as I type. Thanks for the great video again.

[@mrmotofy]

Ha I just picked up an 08 with 300k diesel. It lived in KY. That is so amazingly clean under there. But that's why I went south to get one.

[@baddriversofnorthtexas6850]

Let's all pitch in together and get south main auto a 4K camera and their own internet fiber connection. Not just for weekly videos... But also as a live streaming shop-cam

[@robertcale6725]

my mechanic days are over and am so glad i can't even make a smart house switch work to turn on a light but glad some people have patience for this

[@fielding68]

I was absolutely glued to your video. You'd make a great Sherlock Holmes. Well done and thank you.

[@HorsepoweredRims]

U moved up to my top videos to watch. Your diag skills are beyond anything i ever learned at lincoln tech or in the field.

[@moparmania86]

Eric please do a video explaining pcm up dates and software programming of newer vehicles. I have no idea what is involved with all that. What happens if you do not do software updates? Do you have to do them for the car to run right...??? Please please do a video. You are a very good mechanic and I know you know your stuff with this new technology, and old! You are the best of both worlds. So please help an old school guy like myself to understand these things. I am a mechanic myself but have never gotten involved with these high tech things and I find myself more and more falling behind!

[@joshuaodowd9107]

If I watched anyone else do this I'd be so lost but you do such a good job of explaining it so we can understand it and I've never really had any clue with electrical diagnosis

[@jamesterrill1938]

Good video, your community is lucky to have you to do this kind of work.

[@asuto120]

I think it was at first a belief that fpcm was the cause of the short circuit .. As long as the car switch is in the off mode .. the fpcm cannot feed the fuel pump without the car switch being turned on..Thank you and everything you offer to your subscribers on the channel

[@ericstevenson7696]

14:41 "Fuse is still blown" I hate when they stay blown 😂 Love you Eric. And I love the content. I'm laying in bed on this freezing cold day looking at older videos before I found your channel.

[@MrBugzzie]

A thanks for the live diagnosis ,recently dealing with No Comm on few items with my Duramax and have probably read all 7 manuals ,watching you helps confirm The Hands on items as well as GM's format ,it's slowly getting smaller and feeling more confident with putting methods of diagnosing into practice vs looking for the quick and easy spotting a open wire LOL. The comm lines were a handful ,yet benefits are meant to streamline, ..... I think Thanks Again Roman

[@mr.h4714]

lol the fuse is "still" blown.......I hate it when they don't unblow

[@paulkirkland1535]

Hello Eric;I went through the same thing with my Dodge neon just before Christmas. A fault of the PCM necessitated a replacement because the car wouldn't pass the emission test. I had to pay a mobile guy to program the PCM once I got it replaced. Yes the newer vehicles can be a real pain to work on so I see where you're coming from. Anyway keep up the good work and thanks for your informative video.

[@EricFortuneJr.]

7:06 That’s the perfect location for any electrical module. Salt, moisture..

[@mindtouchone]

I love work, I can sit and watch people work all day long. Great info videos.

[@tcpnetworks]

Proof that conformal coating a circuit board does not make it impervious to failure.

[@gordonrollenhagen6750]

Conformal coating causes more failures than protection, the module and its components expand and shrink with changes in temperature of the board and its components, while the coating resistance to this heat and cooling causes the components soldered leads to break loose from the board. Fuel pumps failures are usually caused by gasoline with alcohol, which attacks the conformal coating on the module and the varnish/coating on the motor windings and armature.

[@brucewalkden2634]

Just a note to thank you for taking the time to share your knowledge. I have found your videos extremely helpful.

[@pookatim]

Astonishing that they put that module where they did considering people use these trucks to tow and launch boats in salt water!

[@eddiemartinez265]

The same thing came to my mind boat ramps.

[@chrisbentleywalkingandrambling]

You say you're no electrician but you certainly are. Great explanation, thanks for the upload.

[@jerryspitler7021]

I really appreciate you bro, i'm just a shade tree mechanic at best but i really like the way you make your videos, some of the best!

[@franksgarageandcustoms8321]

Think i watched this a while back. Gave me confidencd to go into one and diagose it. The torroid coil failed. I bypassed it. No noise/feedback it ran fine. The jumper to test it and make it run was a great help.

[@mikeodonnell3492]

Great job. I like your diagnosis procedures. As another auto professional, I would be interested in the time you charged for the entire job.

[@donaldpainter956]

Not downing you at all Mr o but I would have cut that cable and got that tire out of my way first thing and unplugged the fuel pump then tested I try to isolate things if I can but you are still the man thanks for the videos I'm a 30 year technician myself and still learn everyday and you are a good teacher always know never assume that's how I was taught 30 years ago

[@guayaco-dm3vu]

One of many of your videos that I love..Very educational Eric always teaching us something.. Like the amp clamp trick to see where the short may be coming from,need to write that down.

[@l.m.b1279]

We did it. We got our 2009 Silverado running thanks so much for your great video. This took longer because of the cold weather and trying to use windows 10 first. You may have mentioned or some other great KZbin guy said use WINDOWS 7. I hope this helps other readers. We used Firefox had to get Java downloaded and purchased the Bosch tool paid the $40.00 subscription bought the fpcm and it’s finally running. Good luck everybody because trucks are made to break. Haha 😂

[@jasonwilson8235]

Wow I just had the same prob in my 2014 Silverado. Found the green crusty at the connector. Truck still started and drove but limited me to 10 mph. The cleaned the connection and put die electric grease and worked fine since.

[@haroldb8642]

I watched Ivan do one and he put a bead of silicone around the edge of the new one to help keep water out. Great video.

[@gpaine]

Gotta love saltwater + electronics + metal. Nothing like upstate NY. Good job on GM for putting over-complicated electronics in a heavy abuse location on a vehicle meant for abuse situations. There's gotta be one GM engineer who's somewhere in the corporate world going, "I told you fools that location was a terrible idea! Remember that meeting we had in conference room 302 back in 2008?? I told you fools. I told you." Our world needs more people to take a step back and think simply and logically occasionally.

[@saxdogg69]

...and after listening to that engineer bitch and moan, he walked to the accounting office and said..."man we're selling fuel pump modules like hot Cakes! I told you! dumbass engineers..."

[@leebarnes655]

You might be misunderstanding the situation though. It's the newer better GM retirement benefits package. Instead of boos, that guy has been promoted and they'll be putting all the brains in as many boxes as they can dream up and all of them will be just an inch or two short on enough sealant to actually work. The plan is clearly working well.

[@eddiemartinez265]

You know just thinking what about on the boat ramp wow that would kill it fast.

[@jottow680]

Greg Paine the TCM in a pt cruiser is put in the wheel well behind the front bumper. It may be silicone potted. But that didn't stop it from rotting out.

[@MrManuel1329]

GM is a parts company at this point lol

[@jamesgriffin4819]

Most informative diagnostic/repair performance I've ever seen! Thank you.

[@Autofixpals]

if you put two post Jack's to Hold the tire up quite often you can push that safety latch over and get the tire down with no issues 70% of the time. I am in New Jersey so I know how much of a pain in the butt those tires are to get down.. you have to use a long flat head screwdriver or a slim pry bar to push that latch over with a little bit of effort and persuasion

[@MattManProductions]

If the Mrs O from the past could see the future kitchen that she has now at the shop... WOO BOY WOULD SHE BE SO HAPPY!

[@thomasniner001]

Wonder how many GM truck owners will try to get their spare tire down this weekend?

[@SouthMainAuto]

Haha good luck :)

[@donaldfaulkner1435]

Thomas Niner I have been soaking my spare tire safety latch with Fluid Film. Maybe it will operate when I need it, maybe not.

[@donaldfaulkner1435]

It is a 2008

[@mecheng1993]

Me... Mine really is just a decoration. Doesn't even have air in it haha.

[@screamingbeagleproductions1876]

Mine is a 2002 and it actually comes down i don't think it has the safety latch or it is broken.

[@chungaleta1234]

Another great fix. These electronic modules are exactly what I try to stay away from by keeping my old truck. God knows what I'll do when it finally dies on me.

[@joetiller1031]

Great video Eric, GM's famous spare tire holder that's why I got mine in the bed had to cut it out.

[@Taz51590]

That remove and replace vs reprogramming got me one time too. Took me about 10 mins to figure out why it kept giving me dumb warnings. I got it whooped though. Good to see other techs that don’t guess are out there. Love your videos. Keep up the great diag work

[@harrycallahan3221]

Watching a video from your channel whilst you are watching a video from your channel. WOAH!! *Insert Bill and Ted Gif*

[@SouthMainAuto]

Besides you and I do people know who Bill and Ted are??

[@richardelliott3980]

Excellent!!!

[@theoldwizard998]

EXCELLENT !

[@jix177]

If you really know who Bill and Ted are, what number am I thinking of? :)

[@carlinlentz6849]

jix177 69 dude!!!!

[@kellylamb359]

This guy is a pretty sharp cookie, knows his stuff.

[@jamesh6229]

great! Now I'm going to go out and try to crank down the spare on my Xterra. I don't think it's been cranked down the 12 years I've owned it

[@d.j.9961]

Why does Chevrolet need a fuel pump driver module? What was so wrong with the older style, just a group of wires that ran to the fuel pump? power & ground for the pump, & the 2 wires for the fuel level/fuel gauge -using resistance to measure the fuel level? love your vids Mr, O! Sometimes I have to remind myself that there are more video's then just sma vids, That simply shows how many sma video's i watch! love your methodology in diagnosis & keeping it simple & fixing it right the 1st time!

[@adventureoflinkmk2]

Welcome to modern times, where as many stupid and unnecessary modules they can squeeze into at once are the order of the day... better sit back, strap on, and enjoy yer God damn stay, cuz it ain't getting any better...

[@arciefan]

Next up for engineers, a spare tire powered hoist to raise and lower the tire and also maintain proper air pressure for readiness at all times, complete with it's own control module of course. These should come on line soon after they unvail the blinker fluid control modules.

[@HighestRank]

arciefan veil*

[@todda.6291]

Thanks for the video! First time diagnosing one of these…had the exact issue..20 amp fuse would blow once FSCM was plugged back in..checked powers and grounds, checked fuel pump and draw all OK..Time to order a FSCM! Thanks for the great videos! Todd

[@reinhuberg3581]

Great video Eric.I learned a lot.One thing I would of done different .not necessarly better would be to power the gray wire with my power probe to see and hear the pump turn on.could also use my low amp clamp 0n the probe tip to check draw.looking forward to more of your videos.question I tried to find your video on ford f150 vacuum hubs to rewatch but i cant find it.?

[@wyattoneable]

I enjoyed that one. I gained some good points, I saw the dogs have no worries and I saw my sticker. Thanks, I'm in good company right next to Keith.

[@michaelstoliker971]

Why doesn't GM just mount the module in a bucket of salt water?

[@Adam-bw4lw]

more $ from the vehicles up keep

[@SouthMainAuto]

Lol or at least in place of the rear mud flap?

[@999thenewman]

Time for a fresh JEEP hat yet?

[@jeffreykreft5442]

Fords does the same thing, right on the frame behind rear left wheel well, nice place for modules. However, does make it easier to change. Would rather change these then dropping the tank and replacing the fuel pump, cheaper too.

[@saulns7159]

There should be a service where all this asshatery gets reengineered or removed, right after you buy a vehicle. Like this moving a computer "indoors", seems like common sense. Just drive straight from the dealer to shop. Call it de-obsolate or unplanned failhood service.

[@franksprecisionguesswork501]

Eric you had the perfect opportunity to pay homage the Spaceballs scene where they’re scanning through the VCR tape. It would’ve been hilarious to see you find yourself searching for a repair video and then looking back at the camera while you’re looking back at the camera. Ha!……….. maybe if you had more coffee.

[@gregmonaghan]

"I do have it good, 'cos I married you". Now that's nice!

[@joeysmama8701]

Greg Monaghan She just said that cause she was on camera😂😂

[@EddieLeal]

Smart too. 😉

[@onemoremisfit]

She's a keeper, aint she?

[@windage]

when he held up the PC board I expected AVE to proclaim; 'there's the shit stain where she let out the magic smoke from the angry pixies'..great vid ! Love the longer diag vids...thanks Eric!

[@ouch1011]

I got my back door absolutely annihilated by one of these once. Kept getting towed in with as a crank, no start with the same U0109 code. Every time when it got to the shop, it would fire up and run perfect. The truck would run and drive perfectly all day. Seems like the problem would only show up once every week or two, but when it did, it would leave the customer stranded. Always seemed to happen when they would drive it and park, wouldn't restart when they went back out to it. I load tested all the power/ground circuits, scoped the communication lines, even checked the sensor inputs for possible signs of shorting. After spending literally days trying to get it to act up, we discussed with the customer and decided to try a new FPCM. Put it in and programmed, drove it a few days with no issues. Gave it back to the customer, next week its getting towed back in crank no start, same code again, starts right up when it gets to us. The problem ended up being the contact for the 20A fuse on the BOTTOM of the fuse block was burnt. When we finally got it to fail at the shop, we were able to determine that there was a significant volt drop on the main power at the FPCM, but the fuse was fine. Traced it all the way back to the bottom of the fuse block. I have no idea why it would work fine for days and load test perfectly whenever it was at the shop, but man that diag sucked. I couldn't even be embarrassed that it took so long to diagnose it since it would work perfectly under load for several days at a time.

[@joeyds]

Unfortunately Same situation with me rn just out of the blue… gassed up drove a mile or 2 parked it for 8hrs it, started it to warm up walked heard it idle down and die hasn’t ran in weeks… That’s why I’m here studying everything he does but unfortunately I don’t have all this fancy equipment just a standard “scope on a rope” lol And a basic voltmeter so try diagnosing it without all his cool tools Everything’s a gamble I’m basically swapping parts and looking around wasting time any advice helps thanks in advance

[@sethleeseberg446]

Ivan did one the other day and added silicone to the back of the module. Another great video.

[@lyleallred904]

engineers should be a mechanic for a minimum of two years before designing vehicles !!!!

[@tedpaszko8274]

Yes

[@ccoats6]

I agree 100%

[@scflooring8658]

ABSOLUTELY!!!! I’ve always said that too!!

[@VTX00128]

@Robert Slackware Ha you're damn right Datsun/Nissan are engineering quality control i had three prior cars in my family from Nissan 1982 Datsun Sentra/1992 Nissan Sentra/2002 Infiniti I35 all with at least 250,000 to 500,000 Miles on the odometers' and now respectively 2016 Nissan Rogue and 2016 Nissan Murano the level of engineering and design their products is bar none. As a independent mechanic they are sometimes a pain in but to work on. It's rare that something major to go wrong (Knock on wood) well at least to me. He'll I'm trying to get a hold of a 1970-73 Zed as a project for. my self.

[@ozzykrahn806]

that will cost gm alot of money.

[@lorrinbarth1969]

Every mechanic has his favorite tools. Watching you struggle with the vice-grips I was thinking - little pipe wrench.

[@Ermal193]

Very good video Eric, Thank You. I would give you 12 thumbs up, to make up for the haters if i could!

[@nicholaslandolina]

Man when it comes to electrical and finess mechanics your are a beast... You are a real mechanic... Some of the people out here are hammer and chisel mechanics and not very good at their job

[@alanpennock3972]

Would it be possible to check the fuel pump by checking the resistance of the fuel pump first rather than blowing fuses?

[@adventureoflinkmk2]

Either that or directly wire the pump.. preferably with a fused wire

[@jeffcotton2120]

Nice use of the process of elimination method, you have a nice rapport in communication easement & profiguration routing technique in covering details.

[@caseknifes]

She is very good to you and I am sure when you are off camera you are a teddy bear.

[@rogerfossette2097]

Each time I watch a video you seem to be using a different scan tool.... Are you that up to date or I am just seeing things....Scanners or the one you learn on is a life savour...

[@OneAuto]

Another quality repair Eric!!!

[@Paul1958R]

Great video. I am not defending the poor construction (poor seal) or unprotected location of the FPCM but I do believe that the FPCM must be located very close (ie short wire lengths) to the FP and FPS to accurately monitor/meter FP supply voltage. That is why it is not mounted in the cab/cabin or part of the PCM. I think this is one of those jobs that 'he can do but we cant' - unless you have a $2K programming tool. Paul

[@cevans0974]

Do you have the ability to flash a new body control module in a 2005 chevy 1500?

[@SouthMainAuto]

Yes sir

[@cevans0974]

I live in Georgia and i knew these people around here was full of it. I was told only a Chevy dealer had the program to flash it..Thanx.

[@SouthMainAuto]

Anyone with a j2534 interface device can do it easy

[@adventureoflinkmk2]

@@SouthMainAuto wonder how much that J2534 interface and software and the scanner ran you...

[@PeterDavis-xq8ix]

thank you brother down here in Nassau Bahamas and this was super helpful for my Tahoe hybrid. that's so sweet man continue to love your wife like Jesus loved us man for here to say she has it good because she's married to you. Blessings man

[@mikeanonymous669]

Hey Eric! Dont mean to armchair quarterback on you bro but this is from an electronic tech to auto mechanic. Just trying to help save you some time. In this case I would have ohmed out the terminals of the FPCM at the module to ground terminal at FCPM (Not on the wiring harness) then ohmed out at the wiring harness (disconnected from FPCM) ground pin to feed to fuel pump. One of them would have been very near zero ohms and the one that did would be the offending part.

[@cmjbrodman]

The resistance on the fuel pump motor wires can be very near 0 ohms and still be good- any where from 0.2-5 ohms measured depending on the design of and how big the motor is in the fuel pump. Resting resistance and running resistance are going to be totally different.

[@bunberrier]

This /\ /\ /\ . Found out trying this on my Grand Am. Thank god there was no "controller module" for the stupid thing, just a motor and integrated float.

[@tazerface8638]

I was just yesterday messing around with the same issue. I looked at the spare tire and one what you know... no way that spare is going to just wind down. not in New York anyways. I'm originally from corning, nice to see locals on youtube. thanks for the vids.

[@mrexecutive1]

40:04 "Garbage in garbage out, that's all i know" lol love it.

[@chads8720]

I've also seen it throw resistance off on pins 6 and 14 which should be 60 ohms....beauty of diagnosing something once you may find a quicker way to test once you go throw your diagnostic. Awesome video

[@wymi]

Congrats on 65K subs !

[@SouthMainAuto]

Thanks!

[@markmalikowski4971]

WOW! I guess General Mayhem doesn't think that vital electronics deserve to be treated as such. Another excellent video!

[@theoldwizard998]

Returnless fuel was "invented" to prevent excessive fuel vapor pressure (more vapors than the charcoal canister can accommodate) when at extended idle in hot conditions (think traffic jam in Houston in August; roadway >100F). Traditional return fuel system simply add heat to the fuel every trip up to the engine and back. The fuel pump is PWMed, which BTW, actually cause it to run a bit hotter. Here is a cheap alternative design. Install a flow switch in the return line that switches between high and low return flow (with hysteresis). Switching cuts in a dropping resistor, This design is unproven.

[@bunberrier]

Thanks, was wondering the whole time why in the heck they wanted to vary the speed of the pump.

[@stevenkroot31]

The actual reason for the returnless system is to save power (electrical power). The fuel pump has to be sized to provide adequate fuel at the highest demand (I.e. wide open throttle and high engine speed and load). The issue is that at idle and low engine speeds and loads there is way to much fuel being pumped so they throw a pressure regulator and a return line in the system and voila always enough fuel and just the right pressure. Problem is the fuel pump always draws about the same amount of power from the electrical system, about 100 watts more or less. With the returnless system at low speeds and idle the power consumption is about 10-15 watts or about 80-90% savings in power. In these days of corporate average fuel economy (CAFE) that is a lot of energy saved in vehicles that don’t get very good gas mileage every little bit counts, making it worthwhile to put $30 or $40 worth of electronics and wires and sensors in the trucks. Not worth it for the cars which already were much more efficient, not enough bang for the buck. As far as heat is concerned if your not using as much power you won’t be dissipating as much heat. On a return system on a hot day the fuel picks up so much heat in the engine compartment the heat from the fuel pump it is just a drop in the bucket. Just throwing a dropping resistor in series with the pump doesn’t lower the overall system power consumption it just moves part of it from the pump to the resistor. Also to precisely control fuel flow the fuel rail needs very accurate pressure control a couple three resistor steps wouldn’t be nearly enough.

[@bobschmaltz4434]

. Couldn't scroll through all comments but have good comment. Wait to you get LIGHTNING strike like I did. Very low mileage Envoy with good insurance thankfully. It came into dealer with no com in ALL modules. Me being a little slow took the job and all hell broke loose between me, shop foreman and gm. Insurance Company would not cover repair until I found strike. After about and hour of searching with 2 of other techs I found a small but hot scorch mark on the right rear tire rim. Went to comb for data unplugged and tried to get comm from modules zip!. 6 modules later, up and running no codes present current or history. Patients is virtue but learned a lot from that mess. PS. insurance company paid 100 0/0. And documented the repair. Thanks Eric!

[@jeffjankiewicz5100]

Mrs. O pushing his buttons...lol😂. Ive worked on my vehicles since I was 16..61 now...I have learned alot from your vids. Thx. Now if I could just figure out why my 91 C1500 only blows cold air with a new rad and heater core.

[@pilarvelazquez7626]

awesome job. love your barins , you are a very smart man.. good job. awesome

[@eddiemartinez265]

Yes he is can remember guys at MIT that could not come near ERIC.

[@kyhomegarage3430]

Hi Eric I love the way you eliminate fuel pump as potential problem by measuring current on fuel pump circuit. Good work. Cheers.

[@michaelmanning97]

I start my day with cars and coffee on velocity,and South main auto

[@Iamadroid]

Must not work for a living

[@MrBlaser51]

You truly point out a method to the madness !!! Mr. Eric O....