The following is a general list of DTC's used in pre-1996 GM vehicles. Not all codes are supported by all models; consulting a service manual for your particular model will narrow down the following list to the ones that may pertain to you.
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
C³I 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
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