Home >> Pontiac >> 2002 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnostic Information and Procedures >> DTC C0235: Rear Wheel Speed Signal Circuit Open; C0236: TCS Rpm Signal Circuit Malfunction; C0237: TCS Throttle Position Signal Malfunction; P1504: Vehicle Speed Output Circuit >> Conditions for Running the DTC