Chevy/GMC/Cadillac Release Fix For 2017 Models With Inoperative Gauges, No Crank or Start Then Stall Condition
Chevy/GMC/Cadillac Release Fix For 2017 Models With Inoperative Gauges, No Crank or Start Then Stall Condition

General Motors has released a technical service bulletin that address electrical issues that may be found in certain 2017 Chevrolet Silverado / Tahoe / Suburban, GMC Sierra / Yukon and Cadillac Escalade. These include gauges that may not work or fluctuate and a vehicle that will not crank, start or starts and then stalls.

Technical Document Number: #PIT5586G
Release Date:  Updated 11/27/2020

Technical Document #PIT5586G Applies To:

  • 2017 Cadillac Escalade
  • 2017 Chevrolet Silverado
  • 2017 Chevrolet Suburban
  • 2017 Chevrolet Tahoe
  • 2017 GMC Sierra
  • 2017 GMC Yukon

Reported Conditions

Condition Set #1

  • Instrument Panel Gauges are inoperative
  • PRNDL does not indicate gear position
  • Multiple “Service System” messages
  • Multiple malfunction lights on instrument panel
  • Radio will not show temperatures
  • Radio will not shut off when door is opened
  • No audible turn signal click but signals still function
  • Error code DTC U0155 in multiple vehicle control modules

Condition Set #2

  • Instrument Panel Gauges are inoperative or fluctuate
  • Vehicle engine will not crank
  • Vehicle engine will not start
  • Vehicle engine starts but then stalls
  • SIR / Service Air Bag System Light On
  • Service Suspension Message
  • Radio is blank
  • Steering wheel controls are not back-lit
  • No audible turn signal click but signals still function
  • HVAC Controls do not work
  • Any of the following error codes have been set: B1011, B1370, B3980, U0020, U0029,
    U007D, U0073, U0078, U0100, U0101, U0102, U0104, U0121, U0140, U0146, U0151, U0155, U0164, U0184, U0186, U0198, U0237, U0255, U0422

Cause For These Conditions

  • Condition #1 may be caused by an error in the serial data gateway module (SDGM) microcontroller. The SDGM can retain power but stop communicating on all CAN channels.
  • Condition #1 or #2 could be caused by a SDGM harness with bent, backed out, or loose terminals on the X1 or X2 terminals.

Fix For These Conditions

If a customer is not extremely technically inclined, GM-Trucks.com recommends they take there vehicle to a dealership for repair.

  • ¬†Remove the power feed fuse for the SDGM (F26DL for trucks / F28DL for SUVs). This is a temporary fix and the conditions may return. GM engineering is working for a software correction fix in December 2020.
  • If removing the power feed fuse does not correct the condition, check and repair damaged, loose, or backed out X1 or X2 terminal connectors.