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

Come along with Eric O. at the SMA shop as he has a look at this 2009 Chevrolet 1500 5.3 that was towed in as a crank no start. It has a code stored in it U0109 for "loss of communication with fuel pump control module." You can follow along with Eric O. as he brings you along and diagnosis the FPCM. We also get to use our J2534 Interface device and do some programming.
Chevy FPCM Vid : • Chevy Truck - P069E, P...
Wells CounterPoint Video Ep.7--Fuel Pump Driver Modules, DM100 & DM103: • Wells CounterPoint Ep....
Interested in stuff seen in the videos or the tools and toys Eric O. likes and uses? Check out the S.M.A. "A-Store" and help support the channel! : astore.amazon.com/httpswwwy083...
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THANKS!
--Eric O.
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Simply send and E-mail to [e-mail] including: your shipping address and e-mail address in the text, I in turn will send you a paypal invoice for $5 each USA or $6 each international. Let me know how many you want and as soon as the paypal invoice is paid I will ship them out ASAP! Thanks for your support of our channel!!
--Eric & Vanessa O.
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South Main Auto Repair
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PO Box 471
Avoca, NY 14809
Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair.

[@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.

[@jamesterrill1938]

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

[@frap6790]

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

[@brucewalkden2634]

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

[@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

[@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.

[@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

[@fielding68]

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

[@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.

[@Krillekris]

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

[@vincentgotter4669]

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

[@mindtouchone]

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

[@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.

[@38911bytefree]

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

[@u.smarshallscommando5924]

👍

[@kyhomegarage3430]

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

[@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!

[@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

[@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.

[@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

[@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.

[@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.

[@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!

[@INDENTUREDTRADER]

I do so enjoy the diagnostic/electrical troubleshooting videos. Fantastic stuff.

[@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!

[@OneAuto]

Another quality repair Eric!!!

[@saxdogg69]

I am a proud KZbin mechanic (despite the pro's jokes haha) and I'll give anything a shot except for the stuff requiring all the specialized programming log ins and scope equipment, etc. The channel has really progressed from the first few videos and you've really hit your stride. Keep on trucking, cuz I know how much work it is to do them.

[@wroomwroom2678]

One of the best shows on KZbin

[@DA-zi6eq]

Wroom Wroom HANDS DOWN!!!

[@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

[@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 !

[@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!

[@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.

[@jamesgriffin4819]

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

[@mrexecutive1]

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

[@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

[@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.

[@mikesomers7193]

What a great video Eric! I just picked up a 2008 silverado from a repo auction today, I replaced 6 or 7 different fuses that someone had removed for whatever reason. Anyway, your video help tremendously! This is the same thing that is wrong with the truck I purchased. I took some video and will post it with a credit for you! Thanks again, great video!

[@EricFortuneJr.]

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

[@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.

[@raymondricketts170]

Love your videos brother do a tremendous job breaking down technical details on an aspainable level.

[@DA-zi6eq]

It's a total pleasure to watch your diagnosis videos. Changing parts is cool too but diagnosis that's what pros do. GREAT Work. And always entertaining! 🎩 off to you Sir O. Ha ha

[@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.

[@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.

[@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.

[@edwardmilewski4361]

Your a great speaker and explain everything very clearly....I wish all mechanics had your quality's..very knowledgeable as well

[@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?

[@joetiller1031]

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

[@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.

[@lexiconyoung]

Awesome video - love the detailed troubleshooting. Totally Solid. Just had a buddy drop a 2009 Tahoe in my yard that won't start. Battery is low, but hooked up a scanner while charging the battery and got this code - wouldn't go away. I suspect I'll find something similar to what you found when I crack into it in the morning. Thanks man - you just gained a subscriber.

[@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.

[@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.

[@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

[@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

[@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!

[@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.?

[@MrBlaser51]

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

[@robc5955]

Eric watched loads of your vids now, just wanted to thank you they are all great and educational etc, appreciate the time they must take when your trying to run a pro shop. Thanks to you and the lovely Leon of bodgit fame as well as the white belted master diagnose Dan managed to use my learning to diagnose a fault and make a fix thanks to you guys, that the numbskulls in remote Scotland seem unable to do, when I got stuck I thought, now what would mr o do now. Cheers.

[@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.

[@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.

[@rgebes222]

Amen on those circuit breakers! I have an f150 kept blowing brake light fuses instantly, plugged in that exact same tool and it worked all the sudden. As you stated I followed the scent which ended up being a melted wire above the headliner for the third brake light. In hindsight I would've used a lower circuit breaker, but I found the short real quick!

[@kellylamb359]

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

[@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

[@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.

[@mikeshain7453]

Eric love the videos. they are very informative. If you get a chance to explain the programming modules again could you explain what tool to use and program site. Much appreciated keep up the good work

[@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

[@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!!!!

[@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.

[@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!😁

[@gregshook1472]

Mrs O cooking abilities are top notch, heating soup from a can in microwave, peanut butter and jelly triple layer, she's going all out for your lunch. But just remember she went all out for you.

[@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

[@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.

[@vetman98]

Great diagnostic video. Thanks for going through the thought process.

[@lorrinbarth1969]

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

[@mr.h4714]

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

[@ermalspahiu9730]

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

[@wag1492]

Great channel! Your automotive theory is better than most other youtubers

[@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

[@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

[@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.

[@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

[@caseknifes]

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

[@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*

[@jeffcotton2120]

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

[@celica02perronfurioso21]

I give you credit on this video cuss you take your time resolving the problems same as me . 👍🏾🙂

[@justinp8946]

Beautiful dogs👍

[@genrllee]

Eric, love the videos and the channel! I relate to your videos extremely well being a mechanic myself for over twenty years, but in lovely Florida without the rust you deal with lol. One thing though, I've noticed you never have a radio playing, is that because you turn it off for the videos, or you just don't have one playing period? Keep up the awesome work sir!

[@jdrs4214]

The DCMA (digital copyright millenium act) feelings pigs will probably make an appearance at his shop and threaten to take down his KZbin channel for playing “free music.”

[@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.

[@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.

[@wymi]

Congrats on 65K subs !

[@SouthMainAuto]

Thanks!

[@michaelmanning97]

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

[@Iamadroid]

Must not work for a living

[@RC-Heli835]

Great video Eric! I learn something new every time I watch your channel. I probably would have dropped the tank and put a fuel pump in and still have the same issue.

[@earlestes8649]

I’m electrician and a repeat customer told me that they were going to call me to work on a well pump, time went on and they had someone else replaced pump still didn’t work. Long story short found a loose neutral wire in the switch j box

[@earlestes8649]

They didn’t need a pump, gotta pay to learn. She says don’t tell my husband, he didn’t ask so I was mum.

[@andrewarney4222]

Thank you for the video, this helped me to diagnose and repair a 2011 sierra that had no communication from the fscm

[@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!

[@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.

[@danssmokintreasures]

Great video. How nice variety of scan tools you have there Eric.

[@TCFixerDude]

Love your stuff Eric. Thanks for the education!

[@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.

[@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.

[@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...

[@brianmiskell9090]

Old video but good stuff man learned a few things with the amperage tool. Good job!