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.
2002 Pontiac Firebird Formula, AutomaticFACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake DTCS
ANTI-LOCK BRAKE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC C0035, C0036, C0040, C0041, C0045, C0046, C0050, C0051 | C0035: LEFT FRONT WHEEL SPEED SENSOR CIRCUIT MALFUNCTION; C0036: LEFT FRONT WHEEL SPEED CIRCUIT RANGE PERFORMANCE; C0040: RIGHT FRONT WHEEL SPEED SENSOR CIRCUIT MALFUNCTION; C0041: RIGHT FRONT WHEEL SPEED CIRCUIT RANGE PERFORMANCE; C0045: LEFT REAR WHEEL SPEED SENSOR CIRCUIT MALFUNCTION; C0046: LEFT REAR WHEEL SPEED SENSOR CIRCUIT RANGE PERFORMANCE (4 WSS); C0050: RIGHT REAR WHEEL SPEED SENSOR CIRCUIT MALFUNCTION; C0051: RIGHT REAR WHEEL SPEED CIRCUIT RANGE PERFORMANCE |
| DTC C0060, C0095 | C0060: LEFT FRONT ABS SOLENOID #1 CIRCUIT MALFUNCTION; C0095: RIGHT REAR ABS SOLENOID #2 CIRCUIT MALFUNCTION |
| DTC C0100, C0105 | C0100: REAR ABS SOLENOID #1 CIRCUIT MALFUCTION; C0105: REAR ABS SOLENOID #2 CIRCUIT MALFUNCTION (3 WSS) |
| DTC C0110 | PUMP MOTOR MALFUNCTION |
| DTC C0121 | VALVE RELAY CIRCUIT MALFUNCTION |
| DTC C0161 | ABS/TCS BRAKE SWITCH CIRCUIT MALFUNCTION |
| DTC C0166, C0171 | C0166: TCS PRIMING LINE VALVE CIRCUIT MALFUNCTION (TCS); C0171: TCS PILOT VALVE CIRCUIT MALFUNCTION |
| DTC C0181 | THROTTLE REDUCTION MOTOR CIRCUIT MALFUNCTION |
| DTC C0182 | THROTTLE REDUCTION MOTOR CIRCUIT RANGE PERFORMANCE |
| DTC C0235, C0236, C0237, P1504 | C0235: REAR WHEEL SPEED SIGNAL CIRCUIT OPEN; C0236: TCS RPM SIGNAL CIRCUIT MALFUNCTION; C0237: TCS THROTTLE POSITION SIGNAL MALFUNCTION; P1504: VEHICLE SPEED OUTPUT CIRCUIT |
| DTC C0238 | TCS THROTTLE POSITION SENSOR COMPARISON MALFUNCTION |
| DTC C0239 | TCS SPARK RETARD MONITORING MALFUNCTION |
| DTC C0240 | PCM TRACTION CONTROL NOT ALLOWED (ETS) |
| DTC C0241, P1571 | 0241: PCM INDICATED REQUESTED TORQUE MALFUNCTION; P1571: TCS DESIRED TORQUE CIRCUIT |
| DTC C0244, P1689 | C0244: PWM DELIVERED TORQUE MALFUNCTION; P1689: TRACTION CONTROL DELIVERED TORQUE CONTROL CIRCUIT |
| DTC C0245 | WHEEL SPEED SENSOR FREQUENCY ERROR |
| DTC C0266 | THROTTLE REDUCTION MOTOR CONTROLLER MALFUNCTION |
| DTC C0550 | ECU MALFUNCTION |
| DTC C0896 | DEVICE VOLTAGE RANGE/PERFORMANCE |
| DTC C0901 | DEVICE #2 VOLTAGE LOW |
Factory Service Tools
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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.
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