Service Trailer Brakes

[newdude]

On 9/7/2021 at 10:25 PM, NWI Denali said:

So I finally pulled the code. Looks like a pretty generic code, loss of signal. U0137. Could this be a bad ground? Any insights? Anyone ever have this code?

 

 

 

 

 

 

Check ground G400.  On the frame at the rear most crossmember.  Find the junction panel where the tail lights are, then look to the right.  You will see a single wire coming off the main bundle to a ground location.  Check that one and clean if necessary.  

 

PIT5562: (Inspect Ground Bolts) Multiple Electrical Issues Including Stall / Crank No Start / Lighting Issues / Memory And Power Seats / Power Windows Inoperative / Heated Cooled Seats / Trailering / ABS MIL / Stability Message - (Apr 17, 2017)

 

• G400

Service Trailer Brake Message

Trailer lighting inoperative

Trailer brakes inoperative

Left Rear Turn signal failure message

No communication with the Aux Chassis Control Module

Left turn signal fast flashing

License Plate lights inoperative

Reverse lights on dim

When in Reverse, left reverse light is inoperative

Cargo lights inoperative

Aux Chassis Control Module:- P0562, C1113, C111B

EBCM: U0137

BCM: B3883

Edited October 14, 2021 by newdude

[NWI Denali]

You are the man, newdude. I know this thread is pretty old now, thank you so much for following up. I ironically have an appt next Wednesday at the dealer, so I will clean that ground this weekend and report back. 

 

Are you a gm tech? You seem extremely knowledgeable. Thanks again.

[NWI Denali]

Well, I cleaned that ground and that still didn't do it either. I really am out of ideas at this point. See if the dealer can find anything Wednesday.

[NWI Denali]

On 10/14/2021 at 1:46 PM, newdude said:

 

 

 

Check ground G400.  On the frame at the rear most crossmember.  Find the junction panel where the tail lights are, then look to the right.  You will see a single wire coming off the main bundle to a ground location.  Check that one and clean if necessary.  

 

PIT5562: (Inspect Ground Bolts) Multiple Electrical Issues Including Stall / Crank No Start / Lighting Issues / Memory And Power Seats / Power Windows Inoperative / Heated Cooled Seats / Trailering / ABS MIL / Stability Message - (Apr 17, 2017)

 

• G400

Service Trailer Brake Message

Trailer lighting inoperative

Trailer brakes inoperative

Left Rear Turn signal failure message

No communication with the Aux Chassis Control Module

Left turn signal fast flashing

License Plate lights inoperative

Reverse lights on dim

When in Reverse, left reverse light is inoperative

Cargo lights inoperative

Aux Chassis Control Module:- P0562, C1113, C111B

EBCM: U0137

BCM: B3883

Well, I finally have a resolution. Had my dealer diagnose it and they actually found the harness rubbed through on the frame near the rear wheel well. Looks like there's a mounting bracket for the brake lines is what did it. They repaired the harness and all good to go now. Thanks to all for the help troubleshooting.

[Ewwa44]

NWI Denali Do you happen to have the harness part number they replaced? or a pic of the location it was rubbing at?

This is driving me crazy!! 

Edited March 29, 2022 by Ewwa44

[NWI Denali]

I have not seen where exactly they repaired the harness, just going off of their word. They said where it runs along the frame rail near the driver rear wheel well.

 

Are you getting the service trailer brakes message? Have you replaced the other 3 parts like I did as well?

[CAS86]

On 4/4/2022 at 3:09 PM, NWI Denali said:

I have not seen where exactly they repaired the harness, just going off of their word. They said where it runs along the frame rail near the driver rear wheel well.

 

Are you getting the service trailer brakes message? Have you replaced the other 3 parts like I did as well?

If you don't mind, how much did they charge you for that fix?

[NWI Denali]

On 1/11/2024 at 7:26 AM, CAS86 said:

If you don't mind, how much did they charge you for that fix?

I wanna say it was around like 300 bucks. I think they charged me like 2 hrs labor