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.
Zane Merva is the Executive Editor of GM-Trucks.com and the President of the New England Motor Press Association (NEMPA). A veteran automotive journalist with over 26 years of experience, Zane is a designated ‘Car Talk’ Expert and has been a contributor to The Boston Globe. He possesses a unique evaluative perspective, having road-tested more than 2,000 vehicles across every major manufacturer. While he is a recognized authority on General Motors truck platforms—including the Silverado, Sierra, and Colorado—his expertise is grounded in decades of deep competitive analysis that few in the industry can match. His commentary has been featured by major OEMs and media outlets, including Hyundai and PR Newswire