GMC · Canada · High
GMC C Series, K Series: Brakes
Affects GMC C Series, K Series · 1988 — about 70 vehicles.
The hazard
Certain C2500 and K2500 vehicles with 6.2 Litre diesel engines and thm700 r-4 transmissions the rear antilock brake system could become disabled by an electrical malfunction. The front and rear brakes will continue to function but the brake warning indicator light will not inform the driver of the rear wheel antilock failure.(non-compliance With CMVSS 105 - hydraulic brake systems). Correction: electrical malfunction will be corrected by installing a jumper wire harness between the transmission connection and the engine wire harness.
What to do
Contact your dealer; the remedy details were not included in the filing.
Critical — crash/injury risk now
High — injury risk; see remedy
Moderate — fix at next service
Low — minor / informational