If you own a 2021 Chevrolet Tahoe or Suburban, GMC Yukon or Cadillac Escalade and the 110 Volt power outlets no longer work after overloading them, here’s why and what you can do to fix them.
Technical Document Number: #PIT5787B
Release Date: 12/2/2020
This Document Applies To:
- 2021 Chevrolet Tahoe & Suburban
- 2021 GMC Yukon & Yukon XL
- 2021 Cadillac Escalade
Reported Conditions
GM has updated a previously released technical document that covers vehicles with RPO code KI4 – 100 volt power outlets.
Some owners may experience that the 110 volt outlets in their SUV no longer work and cannot be reset after using electrical devices that overload the system. The green indicator on the dash switch will flash green.
Code B1A78 will be set in the vehicle diagnostics.
Overloaded 110 Volt Outlets That Won’t Reset – How To Fix
A software bug in the body control module will not allow the outlets to reset after being overloaded. It will be necessary to take your vehicle to a dealership to get the BCM reflashed with new software under warranty.
The dealership will not have to replace the BCM or inverter.
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