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 MANUALSPONTIAC2005MONTANA SV6 AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTILOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0121ACTION TAKEN WHEN THE DTC SETS
2005 Pontiac Montana SV6 AWD
Action Taken When the DTC Sets
2005 Pontiac Montana SV6 AWDSECTION Action Taken When the DTC Sets
If equipped, the following actions occur:
- The EBCM disables the Antilock Brake System (ABS).
- The ABS indicator turns ON.
- Dynamic rear proportion (DRP) function is degraded (w/NW7 or JL4).
- DRP function is disabled (w/o NW7).
- The red brake warning turns ON (w/o NW7).
- The EBCM disables Traction Control System (TCS).
- The EBCM disables Vehicle Stability Enhancement System (VSES).
RENDER: 1.0x
NO RELATED
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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.