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GM Trailer Brake Control Module (TBCM) — part number 20850923, programmed to your VIN and ready to install. GMT900 trailer brake modules require SPS programming; a blank or used module will not work until it is set up for your truck.
This module drives the electric brake output for the factory integrated trailer brake controller (RPO JL1). Typical symptoms: "Service Trailer Brake System" message, no trailer brake output, or trailer brake DTCs that follow the module.
Fits (confirm by VIN):
Chevrolet Silverado 1500 / 2500 HD / 3500 HD 2007–2009
GMC Sierra 1500 / 2500 HD / 3500 HD 2007–2009
2009 Avalanche, Tahoe, Suburban and Escalade (applicable configurations — confirm by VIN)
Interchange / superseded part numbers (all replaced by 20850923):
25866061, 25818158, 25907533, 25788981, 25854535
GMT900 trailer brake modules by year: 2007–2009 20850923 · 2010 20850925 · 2011–2012 20791897 · 2013–2014 20964299. 1500, Tahoe, Yukon, Avalanche and Escalade applications outside the years above vary by configuration — send us your VIN before ordering.
Not the frame relay: the finned aluminum Trailer Brake Continue Relay (20904439) on the rear frame rail is a separate, non-programmable part. This listing is for the programmable module.
What you get:
New GM module programmed with the latest GM calibration for your VIN
Plug and play — install, clear codes, and test with a trailer connected
What we need: your 17-digit VIN at checkout.
Not for: 2014–2019 Silverado / Sierra 1500, 2015–2019 HD, 2015–2020 Tahoe / Suburban / Yukon / Escalade, or 2016–2022 Colorado / Canyon — those use 85073617. 2019+ new-body trucks use 85073615 or 85073616.
Not sure this is the right module? Send us your VIN or the number off your unit and we'll confirm the exact match — same business day, Mon–Fri.
GM Trailer Brake Control Module (TBCM) — part number 20850923, programmed to your VIN and ready to install. GMT900 trailer brake modules require SPS programming; a blank or used module will not work until it is set up for your truck.
This module drives the electric brake output for the factory integrated trailer brake controller (RPO JL1). Typical symptoms: "Service Trailer Brake System" message, no trailer brake output, or trailer brake DTCs that follow the module.
Fits (confirm by VIN):
Chevrolet Silverado 1500 / 2500 HD / 3500 HD 2007–2009
GMC Sierra 1500 / 2500 HD / 3500 HD 2007–2009
2009 Avalanche, Tahoe, Suburban and Escalade (applicable configurations — confirm by VIN)
Interchange / superseded part numbers (all replaced by 20850923):
25866061, 25818158, 25907533, 25788981, 25854535
GMT900 trailer brake modules by year: 2007–2009 20850923 · 2010 20850925 · 2011–2012 20791897 · 2013–2014 20964299. 1500, Tahoe, Yukon, Avalanche and Escalade applications outside the years above vary by configuration — send us your VIN before ordering.
Not the frame relay: the finned aluminum Trailer Brake Continue Relay (20904439) on the rear frame rail is a separate, non-programmable part. This listing is for the programmable module.
What you get:
New GM module programmed with the latest GM calibration for your VIN
Plug and play — install, clear codes, and test with a trailer connected
What we need: your 17-digit VIN at checkout.
Not for: 2014–2019 Silverado / Sierra 1500, 2015–2019 HD, 2015–2020 Tahoe / Suburban / Yukon / Escalade, or 2016–2022 Colorado / Canyon — those use 85073617. 2019+ new-body trucks use 85073615 or 85073616.
Not sure this is the right module? Send us your VIN or the number off your unit and we'll confirm the exact match — same business day, Mon–Fri.