Transport CanadaHigh Risk
1988 GMC C SERIESTransport Canada Recall #1988070
The official notice
Defect
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).
Safety Risk
No risk description available.
Remedy
electrical malfunction will be corrected by installing a jumper wire harness between the transmission connection and the engine wire harness.
70 vehicles affectedMfr ref: 8A31/88037Updated June 10, 2026