The problem: affected vehicles equipped with the Integrated Trailer Brake (RPO code JL1) may have a “Service Trailer Brake” message when connecting a trailer with an electric brake to their vehicle. Additionally, this warning may light up when the driver attempts to use the manual apply slider on switch or depress the brake pedal while towing.
The fix: certified GM technicians will be instructed to inspect the unit and replace the Trailer Brake Control Switch as necessary. It will take GM techs roughly an hour-and-a-half to perform the fix.
Affected components: Trailer Brake Control Switch.
Affected vehicles: (including all affected GM models):
- 2022 Cadillac Escalade
- 2023 Cadillac Escalade
- 2022 Cadillac Escalade ESV
- 2023 Cadillac Escalade ESV
- 2022 Chevy Silverado 1500 (refreshed model)
- 2023 Chevy Silverado 1500
- 2022 Chevy Suburban
- 2023 Chevy Suburban
- 2022 Chevy Tahoe
- 2023 Chevy Tahoe
- 2022 GMC Sierra 1500 (refreshed model)
- 2023 GMC Sierra 1500
- 2022 GMC Yukon
- 2023 GMC Yukon
- 2022 GMC Yukon XL
- 2023 GMC Yukon XL
- 2022 GMC Hummer EV
Number of affected vehicles: it’s currently unclear how many vehicles are affected by the service bulletin.
Owners should: wait to be contacted by GM or schedule an appointment with their local GMC dealership to have the service bulletin performed. Notably, this Customer Service Program will only be in effect until March 31st, 2025.
- GM Customer Satisfaction Program Number: N222384930
- GMC Customer Service: 1-800-462-8782
It’s worth noting that the vast majority of vehicles affected by this service bulletin ride on the GM T1 platform, with the GMC Hummer EV being the only exception. GM’s all-electric supertruck rides on the GM BT1 platform, and utilizes Ultium battery and Ultium Drive motors for motivation as opposed to the ICE engines used by the other vehicles.