GMC TRUCK WON'T CRANK! No Communication

2007 GMC Yukon DENALI XL came in on the hook for a no crank, no start condition. Video shows easy method of diagnosing a lo-speed communication network that is down. In the end got the truck back up and running and returned to a grateful customer with no parts required. Thank you for watching!

[@markpacheco2348]

Bro you are the Goat 🐐!! I actually lost my job because I couldn't get my truck started for a week. I did what you said and just Took the wire off and fixed my problem! Thank you now I could find another job.😂😂😂 Thank you

[@BustedtoBuilt]

Glad I could help

[@integrab21a1]

I’m a mechanic and this can bus stuff as amazing as it is was confusing lol now it’s a lot easier to figure out

[@vanhandled]

This video helped me out big time yesterday I was stuck for almost 3 hours till I found your video

[@BustedtoBuilt]

Thanks for watching! Glad it was useful!

[@timothysalazar7030]

Man I have an '09 3500 GMC dually Duramax having the same problem I believe you figured it out for me thank you very much sir I'm going to go try it right now

[@jerrybobbers1]

Wow man thanks.....I actually did this on my 2013 Acadia Denali and just like yours it was the rear splice pack but I got one problem. I connected the light to every pin and only 1 pin was grounded which was Pin #3. Upon looking at the Mitchel Ondemand electrical schematic it says that Pin #3 is "not used" but clearly it is being used because I can see the wire and its grounding. Do you have any ideas on what that wire is for because it's not listed on the Mitchel Ondemand electrical schematic...Thanks

[@johnmassey9449]

Great work

[@BustedtoBuilt]

Thanks for watching!

[@AH-ro9rr]

Great video! I have several modules showing lost connection to BCM. And stabilitrak off on dash. Is my bcm bad? Or can I use this process with each module? Any help is greatly appreciated! I’ve been at this all day.

[@BustedtoBuilt]

Could be a bcm, can you communicate with bcm?

[@user-fk5oo6md6r]

I have the same problem and same vehicle. My issue is a little bit different though. On the front splice pack im getting voltage on all of them. This can only mean that all my modules are shorted to ground correct?

[@kevinAuman1]

Damn man, this is actually the first in-depth vid i have found on the denali and their lovely problems! Unfortunately my 08 6.2L denali has a similar issue although if i keep trying the key and or hold it in the crank position then it will start maybe 4 out of 10 tries but no gauges on the dash other than voltage and then after it starts it only runs for 30sec and then it dies every freaking time and it also will not communicate with any scanners/code readers whatsoever! Tried multiple code readers and even one of the big fancy ones my buddy borrowed from his work still wouldn't connect? I had the truck registered and drove it for a year without a single hiccup then had a problem with my license and parked it in my driveway for little over a year and thru a NY winter... Well now i got my license fixed and ready to put it back on the road but my luck she has these unknown issues outside of my ability to diagnose and i literally need the truck so that i can get to my doc apts as im a disabled combat veteran and i live alone so no other means of transportation 😕 bout ready to give up and scrap the thing or sell parts off of it till i have enough money together to buy a cheap clunker... Motor runs like new and other than the issue causing it to shut off after starting it is a beautiful vehicle if you have any suggestions for things i might be able to try or do to diagnose the problem I'd be incredibly grateful 🙏

[@052500hd]

I used your info to trace comms issue to bad SDM... Unplugged it and truck fired right up!

[@BustedtoBuilt]

Awesome! Glad video was able to assist!

[@constantinmilitaru]

Great video…

[@BustedtoBuilt]

Thank you!

[@user-ed6kw8tf8e]

This is a very detailed video and I appreciate your time that you put into explaining this but I desperately need help I’m following your steps and it looks like I have power approximately 12 to 13 V on my low speed connection when I put the voltmeter from ground to the hot side basically from the data link connector pin one to pen 16 it has voltage but when I hook the test light up to it when I go from pin 1 to pin 16 the light doesn’t show up

[@user-ed6kw8tf8e]

I’m very new to this because I’m a mechanic myself and I’ve never dealt with this issue to be honest with you the alternator wire touch the ground and now the truck will crank but won’t turn on and it looks like I’m not getting spark and I just got a bunch of codes and of course one says no communication to body control VCIM and a lot of different ones.

[@BustedtoBuilt]

Thanks for watching! Pin 1 should not be a ground. Pins 4 and 5 are. Have you checked powers and grounds at modules throwing communication codes?

[@AH-ro9rr]

Great video! I have several modules showing lost connection to BCM. And stabilitrak off on dash. Is my bcm bad? Or can I use this process with each module? Any help is greatly appreciated! I’ve been at this all day.

[@mrdeanv4414]

Great video very informative 👏 however I have an 07 Ext Escalade my wife hut a dear and the truck went to the shop and 7 weeks later we got it back but not before the shop said they had trouble getting the headlights to work... they finally got them to work.. my wife brought the our truck home and it died 8 blocks from the house... 2 hours later it fired up so I jumpered the fuelpump relay and it worked so like you I moved a relay from the A/C In its place and got another relay and 20 miles down the road it dies again... so I replaced the fuelpump which is underneath the back seat because I had just filled the truck up with fuel before all the problems (34 Gallons) so I pushed the backseat forward took a box cutter cut the carpet, took a grinder with a cutting wheel and very carefully made a door in the floor and then removed and replaced the fuelpump... but didn't fix the problem so I changed the crank relay, starter relay,evap under the hood and the Ignition switch under the steering wheel .. changed nothing then I found people on KZbin with the exact same problem so I changed out ECM... now it runs I have a car reader Bluetooth threw my phone and it says that the Crank Shaft Sensor is not learning from the ECM i dont know what to do... very Frustrated 😠

[@BustedtoBuilt]

Very frustrating indeed. It sounds like a crankshaft position relearn is what is required with your new ecm to correct which I have only ever done with a scan tool. Should be something a local shop can perform

[@mrdeanv4414]

@@BustedtoBuilt Thank you..!

[@jesusmayahua8510]

Check your fuse box, sometimes they fail too. It happened to me. Exactly same symptoms.

[@mrdeanv4414]

@@jesusmayahua8510 Thanks

[@conradmaceo]

Wish some of you KZbinr’s were in my city! Cause I’ve seen a few of you cure my U0100 issue, yet I have no idea who to trust with my vehicle here in Indianapolis 🤷🏽

[@BustedtoBuilt]

They can be a pain to figure out most of the time, I was lucky to get this one in that had a constant problem. A lot of times they're intermittent and take quite a bit of time. I will say Indianapolis has a lot of good technicians. I went to school there at Lincoln tech and worked at car-x in Carmel for quite a while. I don't know what rocks they're hiding under but they are there, good luck with your repair!

[@conradmaceo]

@@BustedtoBuilt Ok, I actually just moved out In Carmel. And yes there are great techs and mechanics here, just gotta find them.

[@daniellajensen7811]

So when i test for the 60ohms im getting nothing on both ends. What would that be

[@bobdeengineer7396]

This is a great video. I am helping a friend out with a similar problem on a 2018 chevy impala. when hook battery on, trunk pops open, hazard light arrows in dash blinks but not actual flashers, high beam light indicator illuminated but not actual high beam light, center high mounted brake lamp lights, push button unresponsive except no key detected. nothing works in the car except radio. no crank. i tested starter relay and the car will crank if i jump the pins. I pulled a code u0100 lost comm with ECM/PCM-A. I tested all relays and fuses and good. DLC pin 4 & 5 are grounds and 6 & 14 gave me 60 ohms. I am thinking there is a similar short

[@BustedtoBuilt]

Thanks for watching and for the compliment!

[@dawsondemontiney1247]

I hope you get this, I been in a bind with my truck 2010 avalanche and I been following you and want to say thank you for teaching us to figure out our own problems. However this question maybe more straight forward and I have the answer, but: WHY WOUKD I HAVE MULTIPLE POWER TO GROUND SHORT ON ALL BUT 2 OF MY CONNECTORS (JK) ? IF YOU GOT THE TIME TO HAVE A QUICK Conversation on the phone I'd be happy to compensate your time or donate. Please let me know.

[@itstimetounlearn]

I have the exact same problem with my 2010 Avalanche. Short to ground on all but pin 4 and one directly below it 8, did you ever figure this out?

[@BustedtoBuilt]

I'm not bright enough to be able to figure out much of anything across the internet. I really only shine pertaining to vehicles I can physically get my hands on. Diagnostics for me is like a chess game. I need pieces and a board, I'm not good enough to play in my head

[@BustedtoBuilt]

I do appreciate you watching, good luck with repair

[@somebodyyoumayknowgg6025]

Damn , it was really informative ℹ️ my Hybrid GMC won’t start either , tryn figure it out

[@BustedtoBuilt]

Thanks and good luck with your repair!

[@waywassup246]

@@BustedtoBuiltcan you help us out

[@losingonlotto3449]

Can you please leave me a diagram of the jx300 splice plug like you had that showed what each wire went to. The one that’s behinds the piller behind the drivers seats. Thanks

[@BustedtoBuilt]

No, sorry

[@kickford]

Love your videos, they are straight forward. I'm curious what software for wiring diagrams you were using to see the canbus circuit and other wiring. Was this all data? I'm tired of spending countless hours trying to figure out wiring without a reliable schematic. Thanks again.

[@BustedtoBuilt]

Yep I use alldata for my diagrams

[@kickford]

I have high voltage on the canbus over 8 volts with no comms to my scan tool on a 2010 tahoe. I unplug the abs module, voltage stabilizes to 2.5v, tool connects and vehicle starts and runs normal. Different abs module installed (yeah i thought i had a home run, not) and the exact same issue when plugged back in? What could induce voltage on the can network when the abs is plugged in that's not the abs module? Could another module or wire down stream be affecting the abs module plug / unplugging? Wiring looks great to the abs. Super awesome video by the way, love your way of diagnosing systematically like this!

[@BustedtoBuilt]

Yes a would tend to believe there is a module or wiring issue down the line from abs. You should be able to jump the can wires at the abs module (module unplugged) to connect the rest of the can circuit and if it still comes up to 8 volts the problem will be elsewhere and you can continue diagnosis

[@kickford]

Yeah it ended up being the suspension module down stream of the abs. I had to jump the can bus in to out so it would still connect to the end resistor. No suspension module now. Going to delete that horrible air ride system anyway. Runs great now.

[@warrengosselin458]

I'm doing the same thing to 07 gmc sierra right now and have ground on pin L to but I don't know where it goes from there no spice in b pillar ???

[@BustedtoBuilt]

On a pickup the second splice pack is under the passenger seat taped to the body harness

[@warrengosselin458]

thanks

[@preston3087]

replaced the starter on my lmm duramax and when i reconnected my batteries i had the same no start issue. radio doesn’t work or gauges just like this. would i go about this the same way for that? i’ve read a guy replaced his bcm and that fixed his

[@BustedtoBuilt]

If you have a scan tool I would see if you can communicate with all the modules. If not then this would be where I would start

[@bfrazier377]

If you’re reading this and maybe have after market battery terminal connections. Check voltage from the battery posts. If that’s good then move elsewhere and check voltage. If it doesn’t match then you might have a failing terminal. 10$ fix

[@kungfujiujitsufliptrick4832]

So how did the key bad fob module cause a non crank? I'm confused

[@BustedtoBuilt]

Very carefully

[@lifteddreamz830]

What would cause a 08 Tahoe 5.3L to no crank no start after replacing the ECM? I tried the key relearn process and it wouldn’t work because security light won’t come on like it’s supposed to

[@BustedtoBuilt]

Has the pcm been programmed with the correct vin number?

[@vanessahumphrey-ghazi8342]

I have a 2000 Chevy Silverado 1500 4.8 engine with almost 600,000 miles on it (original engine), and of course, it's had some issues over the years. I run hotshot for the oil and gas industry. I've been driving this truck for over 13 years. Most issues are minor and don't cost much to fix. For the last few years, the security light flashes and stays on most of the time. It seems to happen whenever I hit a bump or when I'm driving on particularly bad roads. The seat belt light starts flashing also as if I'm not wearing one. Last Friday, while I was waiting to be loaded at a warehouse, I turned the truck off. When I went to start it, no dash lights, no sound, no nothing. The lights and horn work. One guy went under the truck and tested the starter. It worked but didn't turn over. I did the security reset move, but I don't think I did it correctly and still was dead at the ignition. I had it towed to my mechanic, and they replaced some fuses. It worked, but when I went to go to work a couple of days later, it made a sound that I've never heard before, like air being moved through a hose or something. It stopped, and I went on to work. I shut it off to go into the office to get paperwork and tried to start it. Same thing happened, dead at the key turn. I kept trying and the media panel dimly flashed and it was trying to turn over. I had to do it a few times, and it finally started. I didn't dare turn it off! I had to leave work and took it to a business that works on electrical issues. They wanted $250 just to check it out but couldn't do anything until after the 4th of July. I told them "bye" and took the truck home. Once I got it parked, I shut it off, and it is dead again. I desperately need to work, and driving is the best job for me. It pays very well, and I'm a slightly disabled senior citizen. If there is something I can do to get my truck running again, it will be a blessing. Any info you can give will be greatly appreciated.

[@BustedtoBuilt]

Sounds like an ignition switch, at 600k I doubt I'll hit the nail on the head but I would be testing at the switch

[@MarkJohnston-bv6pz]

It's the vat system there is a plug on the ignition switch once you take the cover off the steering colum you'll see a plug well that plug fits to lose that's why It cut out when you bumped take the yellow and brown or red wires together and you just bypass the security vat . But you have to still do the key relearn , there's videos for that too

[@conradmaceo]

So a break out box can be used to do this same kind of test?

[@BustedtoBuilt]

Yes that would probably be the preferred method, I don't have one so I don't use one

[@beauxwalwer4894]

what program or device are you using to read the codes??? just curious

[@BustedtoBuilt]

This is a launch x431 scan tool

[@AntoinetheDisciple3075]

Awesome video what kind of scanner is that pls

[@BustedtoBuilt]

Thanks! This is the launch x431

[@aundradickens1180]

What software you use for your wiring diagrams. I've been looking at aldata and mitchell​@@BustedtoBuilt

[@BustedtoBuilt]

I use alldata

[@hunterstovall6872]

man I been having problems with my truck for about 3 months sometimes it won’t crank, when im driving dash a start flickering, doors a lock and unlock nobody around me knows anything I just want to know where should I start ?

[@BustedtoBuilt]

Sounds like a communication issue. Have you read any troubles codes from any modules?

[@mikeneff832]

I got 12v all the way through and good grounds but same issues with radio and windows.

[@BustedtoBuilt]

Are you using a scan tool to try and diagnose?

[@mikeneff832]

@@BustedtoBuilt my obd2 port isn’t working.

[@BustedtoBuilt]

Ground on pins 4 and 5 and battery voltage at pin 16?

[@mikeneff832]

@@BustedtoBuilt it’s a 2003 trailblazer I’m on the side f the road now stranded. Looking at ribbon wire on bcm under driver rear seat. Corrosion between bcm and ribbon wire. May be it but definitely will be an issue

[@javig6111]

What diagrams are you using I’m so close to finding the issue but need the diagrams 😭😮‍💨

[@BustedtoBuilt]

I get my diagrams from alldata hth. Thanks for watching and good luck with repair!

[@user-ux9kq7ge1k]

Having the same issue on my sierra denali. No communication to ecm any help?

[@BustedtoBuilt]

Is there any other data you can provide? I have a 0% success rate when it comes to shooting from the hip with diagnostics

[@freds5109]

Hello I the same problem with my 2005 Tahoe but my radio still work half of my cluster working can u help me out with some pointers

[@BustedtoBuilt]

There's no communication or it just won't start?

[@freds5109]

@@BustedtoBuilt just won’t start

[@BustedtoBuilt]

Have you checked Power to the s terminal on the starter while key in start position? Or tried jumping power to the s terminal to get it to crank?

[@slickmick1866]

Positive battery cable broke off my starter. Got new cable, no crank. New starter, new ignition switch, cables, fuse box. Have an ignition code 1682 or something. I can’t figure this out and I desperately need help. And no, a shop isn’t an option

[@bobdeengineer7396]

Just an update, my test for short to ground turned up the high speed GMLAN (+) pin 6 showed up at the chassis control module. High speed GMLAN (-) pin 6 grounded between BCM and CCM both modules disconnected. Also ground blue wire and white wire (isolated from CCM) led me to the left wheel well where a past caught on fire wire connector and park brake control module once lived which had burnt a hole in the wheel well fender plastic barrier. 😂. This car has evidence of a lightning strike during what appeared to be a bad hail storm. 😢 Or a crossed battery jump start. 300amp fuse is blown and temporarily bridged. 😮

[@BustedtoBuilt]

Yuck, sounds like a nasty one

[@pmsprivatemanagementsoluti5440]

I finally figured it out wow after a year and 5000 dollars 🤦🏽‍♂️

[@jakariharvey]

My truck is doing the same thing. I checked my front splice pack and only one of the prongs had power the rest were grounded . I need help

[@BustedtoBuilt]

There shouldn't be any circuits in the splice pack that are grounded or battery voltage, they are all communication lines, the circuits shorted to ground will need to be diagnosed as to why they are pulled down to ground and would start there

[@jakariharvey]

Ok. My front splice pack is grounded on the m and c . And my rear one is grounded on all of them. I’m not sure what to do

[@BustedtoBuilt]

Are you using a test light or a meter?

[@sherrod833]

Made it to the first splice pack and found the actual wire but I can't find any numbers or alphabet to indicate which one it is.

[@BustedtoBuilt]

The splice pack under the dash?

[@sherrod833]

@BustedtoBuilt Actually made it back to the second splice pack in the pillar but now the short has disappeared.

[@LeekAudio]

All mines light up when i test what does that mean!

[@BustedtoBuilt]

Can you give any context at all?

[@Screamingz1]

Did they take the battery cables off and then it started doing this after they put them back on? Or did this just happen all of the sudden

[@thorthunder3227]

I do not get any codes on my code reader. What is wrong? Will not crank, fuel has pressure, all lights work. Key will not send positive to crank wire.

[@BustedtoBuilt]

If you jump power to the s terminal on the starter will it start? Are you using a tool that can read all the modules or only ecm?

[@thorthunder3227]

@@BustedtoBuilt I have not read all the terminals yet, got ot pick up my test light today. But, the PCM had a little yellow wire cut and i tied it back and the switch cranked the engine over but no start.

[@salamalaseel561]

I have the same problem what should i do 😞😞

[@BustedtoBuilt]

Have to figure out why you have no communication. Either lines open shorted or grounded

[@salamalaseel561]

@@BustedtoBuilt thank you very much yes that’s what i will do tomorrow i will take to a specialist i hope they will found the problem 🙏🏼

[@AliAli-sp1qm]

حليت المشكله اخوي ؟

[@salamalaseel561]

@@AliAli-sp1qm ياهلا بلطيب اي اخوية حليتها عند المصلح

[@TheSpeeddriven]

Maybe I’m confused, when touch the data port with the test light? You had 12 volts with the meter. Why wouldn’t it light up? Guess what I’m saying is you expected it to light up so why does that prove it short to ground?

[@BustedtoBuilt]

Not sure where the confusion is coming from, after showing battery voltage on the meter, the test light did light up. The light was connected to b+ so when I probe pin 1 and the light lit up we know it's a short to ground

[@TheSpeeddriven]

So the meter shows 11.92 volts. That’s pin 1, negative lead Pin 16, positive lead. Test light clamped to pin 1 , light to pin 16. So 12 volts. Is pin 1 not a ground to begin with? So I would expect it to ground and the light come on. Maybe I’m over thinking it. Sorry. I’m at the same problem. Besides the I got power on most every pin in the junction block? And outta know where the shifter doesn’t need the brake depressed to get it outta park? Still locks when the key is removed with steering.

[@BustedtoBuilt]

Correct pin1 should not be grounded, that is the short to ground. pins 4 and 5 are ground and 16 is b+. Pin 1 is everything on the low speed network, with it shorted the modules on that network can not communicate. Hth

[@losingonlotto3449]

@@BustedtoBuilt can you please leave me a link to the diagrams you was using specifically the one that goes to the splice plug behind the pillar behind the drivers seat. Thanks

[@craigjames693]

I got a 2009 GMC Yukon Denali xl 6.2 having similar problems I see you trouble shoot on the 2008 GMC Yukon it's very impressive never seen that style of trouble shoot an the diagram trying to see where to start sometime it turn an then sometime it just show lights but want change

[@constantinmilitaru]

Replaced TCM, and no connection, no start no nothing

[@BustedtoBuilt]

That sounds expensive, bummer. Working on yourself or at a shop?

[@ih8people679]

I got a 2007 2500hd Z71 6L for 2200$ and it had the dash lights come on but no start. I purchased the truck anyways and towed it to my house. The guy who had it had it stored all winter then when it didn't start he replaced the battery but still nothing, no dome lights, head lights or cranking. I ran a wire to the starter and positive fuse and it was cranking but no start. Then I thought about that onstar system that was in it. I Pulled fuse 47 or 48.. (I forget) and put it back in and just like that it started.

[@ih8people679]

Actually I forgot to mention I noticed mine had no indicator line under what gear it was in.

[@constantinmilitaru]

@@BustedtoBuilt working on it myself. I tried to jump it on relay with a paper clip and now the security light is on always. I can’t reset it, the dashboard security light…??? If I could I would run a wire from relay power &trans. 26 to ground it should start. I don’t have a tech 2 scanner.

[@constantinmilitaru]

@@BustedtoBuilt where are you located? Sir