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Thread: OBD1 diagnosti trouble codes (will post redneck obd1 sensor later)

  1. #1
    Shadetree Mechanic blazer8487's Avatar
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    OBD1 diagnosti trouble codes (will post redneck obd1 sensor later)

    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 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

  2. #2
    The man, the myth, the legend
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    The "redneck" obd1 cel way to check it is a paperclip or small U shaped piece of metal. On your obd1 port you insert the clip into the top two right hand holes. It will blink once then twice indicating code 12 which means your ecm diagnostics is working properly. Then it will blink the appropriate code. Like o2 sensors is 44 so it would flash four times pause then four more times indicating 44

  3. #3
    Shadetree Mechanic blazer8487's Avatar
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    yup, i had a whole picture diagram to go with this but when the site crashed it got erased so i need to get around to it cause i know it helped people before

    the original shade tree mechanic. MAY 2009 TOTM

  4. #4
    The man, the myth, the legend
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    Yea well my diagnostic tool fits in my cupholder lol.

  5. #5
    The man, the myth, the legend GCAL50's Avatar
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    Here's a visual.
    Last edited by Skin-K5; 11-27-2010 at 07:32 PM.

  6. #6
    Senior member topprolmc's Avatar
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    But DO NOT JUMPER THOSE WITH TRUCK RUNNING.

    Truck off, jumper...Turn key to On position, but DO NOT START IT.....

  7. #7
    Enjoying Life Chief Hunglikmule 70-K5's Avatar
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    What happens if you do?

  8. #8
    Senior member topprolmc's Avatar
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    Cook the ECU....

  9. #9
    Enjoying Life Chief Hunglikmule 70-K5's Avatar
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    Fried, boiled or bbq'd? Are ECU's good with cheese?

  10. #10
    Senior member topprolmc's Avatar
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    No Personal experience...I think Fricassee

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