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.
2001 Pontiac Firebird Formula, AutomaticFACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake DTCS
ANTI-LOCK BRAKE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Definition |
|---|---|
| C0035 | Left Front Wheel Speed Circuit Malfunction |
| C0036 | Left Front Wheel Speed Circuit Range/Performance |
| C0040 | Right Front Wheel Speed Circuit Malfunction |
| C0041 | Right Front Wheel Speed Circuit Range/Performance |
| C0045 | Left Rear Wheel Speed Circuit Malfunction |
| C0046 | Left Rear Wheel Speed Circuit Range/Performance |
| C0050 | Right Rear Wheel Speed Circuit Malfunction |
| C0051 | Right Rear Wheel Speed Circuit Range/Performance |
| C0060 | Left Front ABS Solenoid No. 1 Circuit Malfunction |
| C0065 | Left Front ABS Solenoid No. 2 Circuit Malfunction |
| C0070 | Right Front ABS Solenoid No. 1 Circuit Malfunction |
| C0075 | Right Front ABS Solenoid No. 2 Circuit Malfunction |
| C0080 | Left Rear ABS Solenoid No. 1 Circuit Malfunction |
| C0085 | Left Rear ABS Solenoid No. 2 Circuit Malfunction |
| C0090 | Right Rear ABS Solenoid No. 1 Circuit Malfunction |
| C0095 | Right Rear ABS Solenoid No. 2 Circuit Malfunction |
| C0100 | Rear ABS Solenoid No. 1 Circuit Malfunction |
| C0105 | Rear ABS Solenoid No. 2 Circuit Malfunction |
| C0110 | Pump Motor Circuit Malfunction |
| C0121 | Valve Relay Circuit Malfunction |
| C0161 | ABS/TCS Brake Switch Circuit Malfunction |
| C0166 | TCS Priming Line Valve Circuit Malfunction |
| C0171 | TCS Pilot Valve Circuit Malfunction |
| C0181 | Throttle Reduction Motor Circuit Malfunction |
| C0182 | Throttle Reduction Motor Circuit Range/Performance |
| C0235 | TCS RPM Signal Circuit Malfunction |
| C0236 | TCS RPM Signal Circuit Malfunction |
| C0237 | TCS RPM Signal Circuit Malfunction |
| C0238 | TCS Throttle Position Sensor Comparison Malfunction |
| C0239 | TCS Spark Retard Monitoring Malfunction |
| C0240 | PCM Traction Control Not Allowed |
| C0241 | PCM Indicated Requested Torque Malfunction |
| C0244 | PWM Delivered Torque Malfunction |
| C0245 | Wheel Speed Sensor Frequency Error |
| C0266 | ADS Controller Malfunction |
| C0550 | ECU Malfunction |
| C0896 | Device Voltage Range/Performance |
| C0901 | Device No. 2 Voltage Low |
| P1504 | TCS RPM Signal Circuit Malfunction |
| P1571 | PCM Indicated Requested Torque Malfunction |
| P1689 | PWM Delivered Torque Malfunction |
Factory Service Tools
Use the Manual With the Right Hardware
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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.