Chevy OBD1 codes

Here is a list of Chevy OBD1 codes, There were various other applications and some cars had different codes. But these usually get me on the right track.

12 No distributor reference pulse (diagnostic test active)

13 Oxygen sensor circuit open or no activity

14 Engine coolant temp sensor error (high temp indicated)

15 Engine coolant temp sensor error (low temp indicated)

16 System voltage too low

17 Camshaft position sensor error

21 Throttle Position sensor error (signal high)

22 Throttle position sensor error (signal low)

23 Intake air temp sensor error (low temp indicated) or mixture control on carb cars

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

25 Intake air temp sensor error (high temp indicated)

26,27,28,29 Quad Driver Module Circuit errors

28 Auto transmission range pressure switch error

31 Wastegate solenoid circuit error

32 EGR system failure

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

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

35 IAC problem or idle error

36 MAF sensor error, Crankshaft Position sensor error, 4T60-E Shifting error

37 TCC brake switch circuit error

38 TCC brake switch circuit error

39 Clutch switch circuit error,TCC error

41 Ignition control error,MEM-Cal error, Cam sensor error(3.8L?)

42 Ignition bypass circuit error

43 Knock sensor error

44 Oxygen sensor error (lean condition indicated) Left bank o2 sensor error (Lean)

45 Oxygen sensor error (rich condition indicated)

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

47 UART (serial data) circuit error

51 PROM error

52 Fuel cal-pak incorrect or missing

53 System voltage too high (More than 17.7 volts), EGR Solenoid error

54 Fuel pump circuit low voltage(1986 and later) , EGR Valve solenoid error

55 ECM error, EGR Valve solenoid error, Fuel lean monitor

56 Quad Driver Module (QDM B) error

57 Boost Control error

58 Trans fluid temp sensor circuit error (low voltage) VATS error

59 Trans fluid temp sensor circuit error (high voltage)

61 A/C system performance

63 Right bank O2 sensor circuit error MAP signal high

64 Right bank O2 sensor lean exhaust indicated, MAP signal low

65 Right bank O2 sensor rich exhaust indicated

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

67 A/C pressure sensor circuit error

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

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

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

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

72 VSS signal circuit error

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

75 Digital EGR solenoid #1 circuit error

76 Digital EGR solenoid #2 circuit error

77 Digital EGR solenoid #3 circuit error

79 Transmission fluid overtemp

80 Transmission component slipping

82 3x Crankshaft position sensor circuit error

85 PROM error

86 A/D error

87 EEPROM error (flash memory error)

90 TCC error

93 Transmission pressure control solenoid circuit error

96 Transmission system voltage low

98 Invalid PCM program

99 Invalid PCM program

Various OBD1 Scanners

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