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GM OBD1 Code List (PDF)

Check the GM OBD1 code list to find out what the codes mean on your car. >> NEXT STEP: https://www.obdadvisor.com/codes/ Visit our site, and type the code in the search box. You will get more information about the code including causes, symptoms, fixes, and repair costs. Reading and clearing the codes will become easier with a scan tool. >> READ MORE: https://www.obdadvisor.com/gm-scan-tool-review/ This article shows a helpful in-depth review of the best OBD1 scan tools for your GM. In fact, GM-specific scanners generally perform better than universal ones, simply because they are made specifically for a particular car brand. It helps to exactly diagnose your vehicle and cut the repair cost.

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GM OBD1 Codes List
Codes Meaning/Fault Location
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)
24 Vehicle speed sensor error (open circuit or no activity)
25 Intake air temp sensor error (high temp indicated)
26 Quad Driver Module (QDM A) error
28 Auto transmission range pressure switch error
31 Waste gate solenoid circuit error
31 Gear Position Switch (PRNDL) error
32
Baro sensor circuit error/ EGR circuit error/ MAP sensor signal
open
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/ 24x crankshaft position sensor circuit error/
4T60-E shifting error
37 TCC brake switch circuit error
38 TCC brake switch circuit error
39 Clutch switch circuit error/ Torque converter clutch error
41
Ignition control error/ MEM-CAL error/ Computer Controlled
Ignition Cam Sensor Signal error
42 Ignition bypass circuit error
43 Knock sensor error
44 Oxygen sensor error (lean condition indicated)
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/ Incorrect MEM-CAL
52 Fuel cal-pak incorrect or missing
53 System voltage too high
53 Digital EGR Valve solenoid 1 error
54
Fuel pump circuit low voltage/ Digital EGR Valve solenoid 2
error
55 ECM error/Digital EGR Valve solenoid 3 error
56 Quad Driver Module (QDM B) error
57 Boost Control error
58
Trans fluid temp sensor circuit error (low voltage)/ VATS
system error
59 Trans fluid temp sensor circuit error (high voltage)
61 A/C system performance
63
Right bank O2 sensor circuit error/ MAP sensor circuit signal
voltage high (low vacuum indicated)
64
Right bank O2 sensor lean exhaust indicated/ MAP sensor
circuit signal voltage low (high vacuum indicated)
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)/ A/C high
pressure switch error
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 over temp
80 Transmission component slipping
82 3x Crankshaft position sensor circuit error
85 PROM error
86 ECM Analog/Digital 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

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GM OBD1 Code List (PDF)

  • 1. GM OBD1 Codes List Codes Meaning/Fault Location 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) 24 Vehicle speed sensor error (open circuit or no activity) 25 Intake air temp sensor error (high temp indicated) 26 Quad Driver Module (QDM A) error 28 Auto transmission range pressure switch error 31 Waste gate solenoid circuit error 31 Gear Position Switch (PRNDL) error 32 Baro sensor circuit error/ EGR circuit error/ MAP sensor signal open 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/ 24x crankshaft position sensor circuit error/ 4T60-E shifting error 37 TCC brake switch circuit error 38 TCC brake switch circuit error
  • 2. 39 Clutch switch circuit error/ Torque converter clutch error 41 Ignition control error/ MEM-CAL error/ Computer Controlled Ignition Cam Sensor Signal error 42 Ignition bypass circuit error 43 Knock sensor error 44 Oxygen sensor error (lean condition indicated) 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/ Incorrect MEM-CAL 52 Fuel cal-pak incorrect or missing 53 System voltage too high 53 Digital EGR Valve solenoid 1 error 54 Fuel pump circuit low voltage/ Digital EGR Valve solenoid 2 error 55 ECM error/Digital EGR Valve solenoid 3 error 56 Quad Driver Module (QDM B) error 57 Boost Control error 58 Trans fluid temp sensor circuit error (low voltage)/ VATS system error 59 Trans fluid temp sensor circuit error (high voltage) 61 A/C system performance 63 Right bank O2 sensor circuit error/ MAP sensor circuit signal voltage high (low vacuum indicated) 64 Right bank O2 sensor lean exhaust indicated/ MAP sensor circuit signal voltage low (high vacuum indicated) 65 Right bank O2 sensor rich exhaust indicated 66 A/C pressure sensor circuit error (low pressure indicated)
  • 3. 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)/ A/C high pressure switch error 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 over temp 80 Transmission component slipping 82 3x Crankshaft position sensor circuit error 85 PROM error 86 ECM Analog/Digital 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