GM OBD-1 Diagnostic Trouble Codes

For 1995-previous model year EFI-equipped GM vehicles.  NOTE: Some codes not supported on all models, consult your specific vehicle's service manual for the correct trouble code list and description for your application.

DTC - 12    No distributor reference pulse (diagnostic test active)

DTC - 13    Oxygen sensor circuit open or no activity

DTC - 13    Left bank O2 sensor circuit open or no activity

DTC - 14    Engine coolant temp sensor error (high temp indicated)

DTC - 15    Engine coolant temp sensor error (low temp indicated)

DTC - 16    System voltage too low

DTC - 17    Camshaft position sensor error

DTC - 21    Throttle Position sensor error (signal high)

DTC - 22    Throttle position sensor error (signal low)

DTC - 23    Intake air temp sensor error (low temp indicated)

DTC - 24    Vehicle speed sensor error (open circuit or no activity)

DTC - 25    Intake air temp sensor error (high temp indicated)

DTC - 26    Quad Driver Module (QDM A) error

DTC - 28    Auto transmission range pressure switch error

DTC - 31    Wastegate solenoid circuit error

DTC - 31    Gear Position Switch (PRNDL) error

DTC - 32    EGR system failure

DTC - 33    MAP sensor circuit error (signal high indicating low vacuum)

DTC - 34    MAP sensor circuit error (signal low indicating high vacuum)

DTC - 35    IAC problem or idle error

DTC - 36    MAF sensor error

DTC - 36    24x Crankshaft position sensor circuit error

DTC - 36    4T60-E Shifting Error

DTC - 37    TCC brake switch circuit error

DTC - 38    TCC brake switch circuit error

DTC - 39    Clutch switch circuit error

DTC - 39    TCC error

DTC - 41    Ignition control error

DTC - 41    MEM-CAL error

DTC - 41    CI Cam Sensor Signal error

DTC - 42    Ignition bypass circuit error

DTC - 43    Knock sensor error

DTC - 44    Oxygen sensor error (lean condition indicated)

DTC - 44    Left bank O2 sensor error (lean condition indicated)

DTC - 45    Oxygen sensor error (rich condition indicated)

DTC - 45    Left bank O2 sensor error (rich condition indicated)

DTC - 46    Pass-Key II (VATS) system error - circuit out of freq range

DTC - 47    UART (serial data) circuit error

DTC - 51    PROM error

DTC - 51    Incorrect MEM-CAL

DTC - 52    Fuel cal-pak incorrect or missing

DTC - 53    System voltage too high

DTC - 53    Digital EGR Valve solenoid 1 error

DTC - 54    Fuel pump circuit low voltage

DTC - 54    Digital EGR Valve solenoid 2 error

DTC - 55    ECM error

DTC - 55    Digital EGR Valve solenoid 3 error

DTC - 56    Quad Driver Module (QDM B) error

DTC - 57    Boost Control error

DTC - 58    Trans fluid temp sensor circuit error (low voltage)

DTC - 58    VATS system error

DTC - 59    Trans fluid temp sensor circuit error (high voltage)

DTC - 61    A/C system performance

DTC - 63    Right bank O2 sensor circuit error

DTC - 63    MAP sensor circuit signal voltage high (low vacuum indicated)

DTC - 64    Right bank O2 sensor lean exhaust indicated

DTC - 64    MAP sensor circuit signal voltage low (high vacuum indicated)

DTC - 65    Right bank O2 sensor rich exhaust indicated

DTC - 66    A/C pressure sensor circuit error (low pressure indicated)

DTC - 67    A/C pressure sensor circuit error

DTC - 68    A/C clutch relay circuit error (shorted to ground)

DTC - 69    A/C clutch relay circuit error (open circuit indicated)

DTC - 69    A/C high pressure switch error

DTC - 70    A/C pressure sensor circuit error (high pressure indicated)

DTC - 71    A/C evaporator temp sensor circuit error (low temp indicated)

DTC - 72    VSS signal circuit error

DTC - 73    A/C evaporator temp sensor circuit error (high temp indicated)

DTC - 75    Digital EGR solenoid #1 circuit error

DTC - 76    Digital EGR solenoid #2 circuit error

DTC - 77    Digital EGR solenoid #3 circuit error

DTC - 79    Transmission fluid overtemp

DTC - 80    Transmission component slipping

DTC - 82    3x Crankshaft position sensor circuit error

DTC - 85    PROM error

DTC - 86    A/D error

DTC - 87    EEPROM error (flash memory error)

DTC - 90    TCC error

DTC - 93    Transmission pressure control solenoid circuit error

DTC - 96    Transmission system voltage low

DTC - 98    Invalid PCM program

DTC - 99    Invalid PCM program

 

return to home page