Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 724 (ANTILOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C1236ACTION TAKEN WHEN THE DTC SETS
1999 GMC Forward Control 5.7 R, Automatic
Action Taken When the DTC Sets
1999 GMC Forward Control 5.7 R, AutomaticSECTION Action Taken When the DTC Sets
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
If equipped, the following actions occur:
- The EBCM disables the ABS/TCS/VSES for the duration of the ignition cycle.
- The ABS indicator turns ON.
- The Traction Control and Active Handling indicator turns ON.
- The DIC displays the following messages:
- Service ABS
- Service Traction System
- Service Active Handling
- The DRP does not function optimally, or with system voltage less than 8.5 volts, the EBCM disables the DRP for the duration of the ignition cycle.
- When the EBCM disables the DRP, the following actions also occur:
- The EBCM will also set DTC C1248.
- The red Brake warning indicator turns ON.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.