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OBD I Codes

Discussion in 'GM 6.5 Diesel Engines' started by jeffjbar, May 8, 2008.

  1. jeffjbar

    jeffjbar Recruit

    244
    0
    May 7, 2008
    Paducah, KY
    OBD I Codes
    [​IMG]


    DTC 12 - No Codes Present
    DTC 13 - Engine Shutoff Solenoid Circuit Fault
    DTC 14 - Engine Coolant Temperature (ECT) Sensor Circuit Low (High Temp)
    DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit High (Low Temp)
    DTC 16 - Vehicle Speed Sensor Buffer Fault
    DTC 17 - High Resolution Circuit Fault
    DTC 18 - Pump Cam Reference Pulse Error
    DTC 19 - Crankshaft Position Reference Error
    DTC 21 - Accelerator Pedal Position 1 Circuit High
    DTC 22 - Accelerator Pedal Position 1 Circuit Low
    DTC 23 - Accelerator Pedal Position 1 Circuit Range Fault
    DTC 24 - Vehicle Speed Sensor Circuit Low (Output Speed Signal)
    DTC 25 - Accelerator Pedal Position 2 Circuit High
    DTC 26 - Accelerator Pedal Position 2 Circuit Low
    DTC 27 - Accelerator Pedal Position 2 Circuit Range Fault
    DTC 28 - Transmission Range Pressure Switch Circuit
    DTC 29 - Glow Plug Relay Fault
    DTC 31 - EGR Control Pressure/Baro Sensor Circuit Low (High Vacuum)
    DTC 32 - EGR Circuit Error
    DTC 33 - EGR Control Pressure/Baro Sensor Circuit High
    DTC 34 - Injection Timing Stepper Motor Fault
    DTC 35 - Injection Pulse Width Error (Time Short)
    DTC 36 - Injection Pulse Width Error (Time Long)
    DTC 37 - TCC Brake Switch Stuck "ON"
    DTC 38 - TCC Brake Switch Stuck "OFF"
    DTC 39 - TCC Stuck "OFF"
    DTC 41 - Brake Switch Circuit Fault
    DTC 42 - Fuel Temperature Circuit Low (High Temp)
    DTC 43 - Fuel Temperature Circuit High (Low Temp)
    DTC 44 - EGR Pulse Width Error
    DTC 45 - EGR Vent Error
    DTC 46 - Malfunction Indicator Lamp (MIL) Circuit Fault
    DTC 47 - Intake Air Temperature Sensor Circuit Low (High Temp )
    DTC 48 - Intake Air Temperature Sensor Circuit High (Low Temp )
    DTC 49 - Service Throttle Soon Lamp Circuit Fault
    DTC 51 - PROM Error
    DTC 52 - System Voltage High Long
    DTC 53 - System Voltage High
    DTC 54 - PCM fuel circuit error
    DTC 56 - Injection Pump Calibration Resistor Error
    DTC 57 - PCM 5 Volt Shorted
    DTC 58 - Transmission Fluid Temp Circuit Low
    DTC 59 - Transmission Fluid Temp Circuit High
    DTC 61 - Turbo Boost Sensor Circuit High
    DTC 62 - Turbo Boost Sensor Circuit Low
    DTC 63 - Accelerator Pedal Position 3 Circuit High
    DTC 64 - Accelerator Pedal Position 3 Circuit Low
    DTC 65 - Accelerator Pedal Position 3 Circuit Range Fault
    DTC 66 - 3-2 Shift Control Solenoid
    DTC 67 - TCC Solenoid Circuit (Open or Short)
    DTC 68 - Transmission Component Slipping
    DTC 69 - TCC Stuck "ON"
    DTC 71 - Set/Coast Switch Fault (Cruise Control)
    DTC 72 - Vehicle Speed Sensor Circuit Loss (Output Speed Signal)
    DTC 73 - Pressure Control Solenoid Circuit (Current Error)
    DTC 74 - Transmission Input Speed (TIS) Sensor Circuit
    DTC 75 - System Voltage Low
    DTC 76 - Resume/Accel Switch Fault (Cruise Control)
    DTC 78 - Turbo Wastegate Solenoid Fault
    DTC 79 - Transmission Fluid Over Temperature
    DTC 81 - Transmission 2-3 Shift Solenoid Circuit
    DTC 82 - Transmission 1-2 Shift Solenoid Circuit
    DTC 83 - Torque Converter Clutch
    DTC 85 - Transmission Gear
    DTC 86 - Transmission Gear Ratio Error
    DTC 87 - Transmission Gear Ratio Error
    DTC 88 - Top Dead Center Offset Problem
    DTC 91 thru 98 - Cylinder Balance
    DTC 99 - Accelerator Pedal Position Sensor 5-Volt Reference Problem
     

    Attached Files:

  2. 94K30

    94K30 Diesel nut

    230
    0
    May 9, 2008
    manchester CT
    how can you clear old codes?
     
  3. jeffjbar

    jeffjbar Recruit

    244
    0
    May 7, 2008
    Paducah, KY
    You can clear the codes by pressing the brake and accelerator pedals fully while terminals A and B connected.
     
  4. Chevylover

    Chevylover MONROE COUNTY SHERIFF

    907
    191
    May 9, 2008
    Hannover, Germany
    And also by disconnecting both battery cables for about 30 minutes.

    Cu,
    Sven
     
  5. 94K30

    94K30 Diesel nut

    230
    0
    May 9, 2008
    manchester CT
    Thanks, guys.....
     
  6. Suburban K2500

    Suburban K2500 New Member

    33
    0
    Jun 20, 2008
    Gettysburg, PA
    can these be moved to the front??? Sticky maybe
     
  7. jbsaxman

    jbsaxman New Member

    197
    0
    May 10, 2008
    The easiest way to clear codes is to remove the fuse for ECM for 30 seconds. Done it several times and checked several times with a scanner to make sure that it cleared the code. (This recommendation is per the Chilton manual)
     
  8. JiFaire

    JiFaire Lieutenant Staff Member Lead Moderator

    7,580
    128
    Feb 10, 2008
    Alberta, Canada
    I'm gonna add a slightly different description and diagram...

    Under your steering column, you have an ALDL plug that looks like the attached picture. With the key off, take a metal paper clip (or another suitable jumper wire) and place the ends in holes A and B. Get a piece of paper and pencil handy, watch the SES light on your dash (beside the speedometer), and turn the key to the ON position. The SES light should start flashing.

    flash-(pause)-flash-flash-(long pause) ... that's a code 12. Means it is about to start sending you codes. It will end with a code 12, too.

    everything in between the 12's on each end will be repeated 3 times. Write them down as they come up. For instance, you could get:

    12-17-18-35-36-71-12

    That means you have codes 17, 18, 35, 36, and 71

    When you're done, and the codes are all written down, clear them by pushing the brake and accelerator pedals to the floor, hold them for 15 seconds, let them up, push them down again, hold, and turn the key off.

    Turning the key on again should get you only a repeating code 12 (all is well).

    Shut the key off, remove the jumper.

    NEVER put the jumper in or take it out with the key on!!
     

    Attached Files:

  9. Schwind

    Schwind split loyalties

    JiFaire
    Have to contribute to your scenario. Because my 94 doesn’t throw the 12 code if I have DTC’s. It begins with the first code in the series of codes or the one code that it gives. If I look for DTC’s and there are none then I get the code 12 in repeat only. I have also read others scenarios where they didn’t get the code 12 as well when other codes were present. Just wanted to say that with DTC’s present you may not start with code 12.
     
  10. kane

    kane New Member

    63
    0
    Aug 17, 2008
    Finland, Europe
    Should someone fix G pin location in the first mail picture?
    Fuel Prime G pin is correctly in JiFaire's picture (ALDL)

    br.kane
     
  11. Pruittx2

    Pruittx2 OBD 1 Master

    675
    7
    May 6, 2008
    Lake Odessa, Mi
    I'll second that,, my 94 also see's no code 12 when others are present.

    Maybe its just a 94 thing.:prrr: :rolleyes:
     

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