GM common codes for OBD1 (for vehicles made before 1995)ġ4 coolant sensor high resistance or shortedġ6 direct ignition system (DIS) fault in circuitĢ3 intake air temp sensor out of range, lowĢ4 vehicle speed (vss) sensor circuit faultĢ5 air temp sensor sensor out of range, highĢ6 quad-driver module (computer) circuit #1 faultĢ7 quad-driver module (computer) 2nd gear circuitĢ8 quad-driver module (computer) circuit #2 faultĢ9 quad driver module (computer) 4th gear circuitĤ1 cam sensor circuit fault, igntion control circuit faultĤ2 electronic spark timing (EST) circuit grounded These are the GM specific OBD1 DTC codes:
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