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.
1998 Pontiac Firebird Formula, AutomaticFACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake DTCS
ANTI-LOCK BRAKE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| 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 |
| C0055 | REAR WHEEL SPEED CIRCUIT MALFUNCTION ("F" BODY W/O TRACTION CONTROL) |
| C0056 | REAR WHEEL SPEED CIRCUIT RANGE/PERFORMANCE ("F" BODY W/O TRACTION CONTROL) |
| 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 ("F" BODY) |
| C0105 | REAR ABS SOLENOID NO. 2 CIRCUIT MALFUNCTION ("F" BODY) |
| C0110 | PUMP MOTOR CIRCUIT MALFUNCTION ("F" BODY) |
| C0121 | VALVE RELAY CIRCUIT MALFUNCTION ("F" BODY) |
| C0161 | ABS/TCS BRAKE SWITCH CIRCUIT MALFUNCTION |
| C0166 | TCS PRIMING LINE VALVE CIRCUIT MALFUNCTION ("F" BODY) |
| C0171 | TCS PILOT VALVE CIRCUIT MALFUNCTION ("F" BODY) |
| C0181 | THROTTLE REDUCTION MOTOR CIRCUIT MALFUNCTION ("F" BODY) |
| C0182 | THROTTLE REDUCTION MOTOR CIRCUIT RANGE/PERFORMANCE ("F" BODY) |
| C0236 | TCS RPM SIGNAL CIRCUIT MALFUNCTION ("F" BODY) |
| C0236 | TCS RPM SIGNAL CIRCUIT MALFUNCTION |
| C0237 | TCS THROTTLE POSITION SIGNAL MALFUNCTION ("F" BODY) |
| C0238 | TCS THROTTLE POSITION SENSOR COMPARISON MALFUNCTION ("F" BODY) |
| C0239 | TCS SPARK RETARD MONITORING MALFUNCTION ("F" BODY) |
| C0240 | PCM TRACTION CONTROL NOT ALLOWED ("F" BODY) |
| C0241 | PCM INDICATED REQUESTED TORQUE MALFUNCTION ("F" BODY) |
| C0244 | PWM DELIVERED TORQUE MALFUNCTION ("F" BODY) |
| C0245 | WHEEL SPEED SENSOR FREQUENCY ERROR |
| C0266 | ADS CONTROLLER MALFUNCTION ("F" BODY) |
| C0450 | STEER ASSIST CONTROL ACTUATOR CIRCUIT MALFUNCTION |
| C0550 | ECU MALFUNCTION |
| C0896 | DEVICE VOLTAGE RANGE/PERFORMANCE |
| C0901 | DEVICE #2 VOLTAGE LOW |
| U1304 | LOST COMMUNICATION WITH UART SYSTEM |
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.