'15 Yukon XL SLT will not start, cluster light going crazy, engine will not shut off

[limax]

Hello everyone,

I'm new to this forum and asking for help. This morning I could not start my '15 Yukon XL SLT. Most of the cluster lights went on/off (check engine, tpms, airbag, theft system... etc) the backlit elements would dim down and up again. Fuel gauge would jump up and down. Decided to disconnect the negative battery terminal for few minutes.... it helped, the truck stared right up without any problems. Drove it to work. At the end of the day I had the same problems so I disconnected the battery again and started it but the cluster lights were still on/off. I proceeded to drive home but the tachometer / speedometer / fuel / temp /voltage gauges would go on / off check engine light TPMS etc.... whole cluster was like a blinking christmass tree.
I made it home but could not shut the engine off (it seemed to me like the car did not know it was running because I could lock / unlock all doors with the remote) so I decided to disconnect the negative cable from the battery but it did not work. I finally shut it down by removing the ECM fuse. With this much going on I think it may be a ground wire broken some place. Any help appreciated.

Max

 

[Doubeleive]

Hello everyone,

I'm new to this forum and asking for help. This morning I could not start my '15 Yukon XL SLT. Most of the cluster lights went on/off (check engine, tpms, airbag, theft system... etc) the backlit elements would dim down and up again. Fuel gauge would jump up and down. Decided to disconnect the negative battery terminal for few minutes.... it helped, the truck stared right up without any problems. Drove it to work. At the end of the day I had the same problems so I disconnected the battery again and started it but the cluster lights were still on/off. I proceeded to drive home but the tachometer / speedometer / fuel / temp /voltage gauges would go on / off check engine light TPMS etc.... whole cluster was like a blinking christmass tree.
I made it home but could not shut the engine off (it seemed to me like the car did not know it was running because I could lock / unlock all doors with the remote) so I decided to disconnect the negative cable from the battery but it did not work. I finally shut it down by removing the ECM fuse. With this much going on I think it may be a ground wire broken some place. Any help appreciated.

Max

First suspect is your battery cables, battery, ground/s, mine turned out to be the alternator but I think it was a extremely rare case.

 

[limax]

Thanks for pointing me in some direction, today I'll inspect battery / engine bay area cables. We've had a lot of snow in NJ lately I think moisture / salt may be contributing to this malfunction.
I'll report later.

 

[zbad55]

A few days ago the wife had a similar issue, she called me all freaked out with all the lights on the dash going crazy could not start the car. I had her put the key FOB in the pocket that is in the center console. All was fine, when she got home I replaced the battery in the FOB and problem solved, maybe this is the issue, this is on a 2015 Yukon also

 

[tsuintx]

These things are known to be pretty damn finicky when it comes to proper electricity. As @Doubeleive said, start with all those and see what you can find.

Also, if you’re still running your original battery from 2015, it’s time to replace it.

 

[limax]

I just finished checking things out and it does not look good. Battery voltage is steady at 12.1 volts, it was replaced on July 2019.
Changed the battery in the key fob. Checked all the cables going to the battery, also the engine bay fuse box. Nothing seems to be out of order.
Right now when I connect the battery I just get all cluster lights once... after I push stop/start button again nothing happens, cluster stays completely dark, when I press the start / stop button all that happens is a relay click. Can't start the engine.

 

[limax]

Quick update from this morning, after all the snow we had yesterday it got really cold about 12° decided to try to start the truck it started right up without any problems. Two days ago I couldn’t even get it to run


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[SuperOldSchool]

I had this occur and it was battery cables. Replaced them under warranty.

go to autozone and have them test your battery to rule that out too.

 

[limax]

Thanks for the info. I took it to the mechanic. He's helped me with electric problems before so I hope he'll be able to sort this out.
Upon first scan he's found some fault codes in the BCM. I'll pass him the info about battery cables as well.
Will let you guys know what he finds out.

 

[limax]

I finally got my truck back, it turns out that it was a faulty side detection sensor located in the left front of the vehicle. It stopped working about a year ago but I didn’t care much for it. As a result it fried BCM module so both needed to be replaced and programmed.


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[ivin74]

I finally got my truck back, it turns out that it was a faulty side detection sensor located in the left front of the vehicle. It stopped working about a year ago but I didn’t care much for it. As a result it fried BCM module so both needed to be replaced and programmed.


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Glad to hear you got it figured out. Thanks for sharing your findings. What did the bcm run you?

 

[dbaudo1]

any idea how they came to the conclusion the BCM was fried? i'm having a very similar issue with my '17 yukon. just start up yesterday and was driving from eastern PA to OH in a slushy snowy mess. thankfully i had waze which provides a speedo so I could get home without a ticket, but now I have to figure out what's causing the problem

 

[15chariot]

I am experiencing the same issues as OP so I suspect the BCM is the issue but was looking for confirmation before I start swapping parts.

While driving, instrument gauges went to zero, multiple warning lights and messages illuminated (seems like all of them), then cycled back to normal. No effect of driveability or performance. Car shut off normally when start/stop button pressed.

Next day, car started normally but same thing happened with gauges and warning lights. Engine did not immediately shut off when start/stop button pressed. Gauges and warning lights kept cycling and eventually engine shut off within a minute. Delayed response to pressing start/stop to turn on ignition. Played around with pushing the start/stop button with and without pressing the brake pedal. Finally got it to start and drive but gauges and warning lights were still erratic.

Ran scan tool and came up with codes below.

Car will now only start with remote start but will not go fully “on” and unlock steering wheel & transmission selector when brake pedal and start/stop button is pressed. 1 out of 5 times will respond to pressing start/stop button. Other times, I just hear 2 relay clicks (not starter) when I press the start/stop button. When it does come on, gauges are in US units but HVAC is in metric (Celsius).

2015 GMC Yukon 5.3L

DTC codes 2/15/2022

Engine Control Module – Pass

Transmission Control Module – Pass

Electronic Brake Control Module (EBCM)

U0073-00/History DTC – Control Module communication bus A off

U0077-00/History DTC – Control module communication chassis expansion CAN bus off

U0102-00/History DTC – Lost communication with transfer case control module

U0126-00/History DTC – Lost communication with steering wheel angel sensor module

U0151-00/History DTC – Lost communication with inflatable restraint sensing and diagnostic module

Power Steering Control Module (PSCM)

U2099-00/History DTC – High speed communication enable circuit

Body Control Module (BCM)

B305A-00/Current DTC – No response from steering column lock received

B3978-00/Current DTC – No environment identifier received from inflatable restraint sensing and diagnostic module

B3979-00/Current DTC - No environment identifier received from HVAC control module

B3980-00/Current DTC - No environment identifier received from instrument cluster

U0078-00/Current DTC – Control module communication low speed CAN bus off

U0100-00/History DTC – Lost communication with engine control module

U0121-00/History DTC - Lost communication with electronic brake control module

Human Machine Interface Module (HMICM)

U0029-00/Current DTC – MOST bus performance

 

[Lisababes]

I finally got my truck back, it turns out that it was a faulty side detection sensor located in the left front of the vehicle. It stopped working about a year ago but I didn’t care much for it. As a result it fried BCM module so both needed to be replaced and programmed.


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Hi I am experiencing the exact same problem. How much did this cost at the dealership

 

[Mindset_Mary]

Hi I am experiencing the exact same problem. How much did this cost at the dealership

Hello, I have a 2015 Escalade and the same thing happened to me, cluster lights going nuts, I see every error message imaginable, my vehicle push button wouldn't turn off my vehicle and then would turn on my vehicle. My GMPP expired 6 months ago and not sure if this would even be covered. Before all this happened I received an error message saying that I should replace the key battery, 10 minutes later everything went nuts on me. If anyone has an words of wisdom or advice I would really appreciate it. Thank You guys in advance for helping me out! Mary

 

[Yukon2703]

I finally got my truck back, it turns out that it was a faulty side detection sensor located in the left front of the vehicle. It stopped working about a year ago but I didn’t care much for it. As a result it fried BCM module so both needed to be replaced and programmed.


Sent from my iPhone using Tapatalk

Hello, I have a 2015 Escalade and the same thing happened to me, cluster lights going nuts, I see every error message imaginable, my vehicle push button wouldn't turn off my vehicle and then would turn on my vehicle. My GMPP expired 6 months ago and not sure if this would even be covered. Before all this happened I received an error message saying that I should replace the key battery, 10 minutes later everything went nuts on me. If anyone has a words of wisdom or advice I would really appreciate it. Thank You guys in advance for helping me out! Mary

Did everyone end up replacing there bcm and did it fix your issues? I’m experiencing the same problem with the same symptoms

 

[Fless]

Did everyone end up replacing there bcm and did it fix your issues? I’m experiencing the same problem with the same symptoms

Who knows? They haven't been on here in about a year. Probably still trying to fix it.

Recommend you start a new thread with your specific vehicle and issues.