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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 by newdude
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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.

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