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.
Selecting Test Mode
Five test modes are available for diagnosing ABS/TCS. Test modes are:
- Data List Mode
Mode continuously monitors wheel speed data, brake switch status, ABS/TCS status, and other inputs and outputs. Data list cannot be read if any DTCs are set. - DTC History Mode
Mode displays diagnostic trouble code history data. Fault occurrence information is stored for first 5 trouble codes stored and very last trouble code stored. Fault occurrence information stored consists of trouble code number, number of failure occurrences and number of ignition cycles since fault first and last occurred. - DTC Mode
Mode displays ABS/TCS diagnostic trouble codes. Both ignition cycle and history may be displayed or cleared. - Snapshot Mode
Mode will help isolate intermittent problems by capturing data before and after fault condition. Snapshots cannot be read until all stored DTCs are cleared.If MANUAL TRIGGER is selected, Tech 2 will wait for ENTER to be pressed before storing data. Tech 2 stores data from 8 seconds before trigger and 8 seconds after trigger is activated. All stored information can be displayed and examined for conditions which might indicate a problem, but may not set a code.
If AUTOMATIC TRIGGER is selected, Tech 2 will capture data, which deviates from normal conditions but may not set a DTC, such as driving over bumpy roads or railroad tracks. Condition may be caused by loose connections or intermittent wiring problems causing signal to drop out momentarily. While Tech 2 is waiting for a trigger, ENTER key may be used to force a trigger.
- Miscellaneous Test Mode
In this mode, the scan tool performs various ABS functional tests to help isolate problems during trouble shooting.
| Code | 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 |
| C0055 | Rear Wheel Speed Circuit Malfunction ("F" Body) |
| C0056 | Rear Wheel Speed Circuit Range/Performance ("F" Body) |
| 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 (Grand Prix) |
| C0110 | Pump Motor Circuit Malfunction (Intrigue) |
| C0110 | Pump Motor Circuit Malfunction ("F" Body) |
| C0121 | Valve Relay Circuit Malfunction (Grand Prix) |
| C0121 | Valve Relay Circuit Malfunction (Intrigue) |
| C0121 | Valve Relay Circuit Malfunction ("F" Body) |
| C0141 | Left TCS Solenoid No. 1 Circuit Malfunction ("W" Body) |
| C0146 | Left TCS Solenoid No. 2 Circuit Malfunction ("W" Body) |
| C0151 | Right TCS Solenoid No. 1 Circuit Malfunction ("W" Body) |
| C0156 | Right TCS Solenoid No. 2 Circuit Malfunction ("W" 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 & Grand Prix) |
| C0236 | TCS RPM Signal Circuit Malfunction (Intrigue) |
| 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 ("W" Body & 1999 "F" Body) |
| C0241 | PCM Indicated Requested Torque Malfunction (1999 "F" Body & Intrigue) |
| C0244 | PWM Delivered Torque Malfunction ("W"Body & 1999 "F" Body) |
| C0245 | Wheel Speed Sensor Frequency Error |
| C0266 | ADS Controller Malfunction (1998 "F" Body) |
| C0450 | Steer Assist Control Actuator Circuit Malfunction (1998 Grand Prix) |
| C0550 | ECU Malfunction |
| C0896 | Device Voltage Range/Performance |
| C0901 | Device No. 2 Voltage Low ("F" Body) |
| U1304 | Lost Communication With UART System (1998 "F" Body & 1998 Grand Prix) |
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.