PIT4508C

File in Section:
Service Bulletin
Bulletin No.:
Date:
PIT4508C
October, 2012
PRELIMINARY INFORMATION
Subject:
Cruise Control Inoperative
Models:
2007 - 2013 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007 - 2013 GMC Sierra, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL
With Brake Controller (RPO JL1)
This PI was superseded to update model years. Please discard PIT4508B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
Some owners may comment of the cruise control being inoperative. The Trailer Brake Control Module (TBCM) may
set a DTC B3894.
Recommendation/Instructions
If normal diagnostics do not lead to a correction, check the "Master Cylinder Pressure" sensor parameter listed in the
TBCM data list. If it is displaying pressure with no brake pedal input, suspect a concern with the Master Cylinder
Pressure Sensor, wiring/terminals, EBCM, etc. On Models with StabiliTrak (RPO JL4), the Master Cylinder Pressure
Sensor is internal to the BPMV/EBCM.
ADDITIONAL SI KEYWORDS:
abs inop switch
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.