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    1994 GMC Truck C1500 1/2 ton Sub 2WD 5.7L TBI 8cyl

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    Kia_Sephia_Rio_Spectra_Optima_1998-2006

    TroubleCodes (30 of 130)

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    1.8L L4 VIN 1 Auto



    Trouble Code: P1507

    IAC Valve Closing Coil Signal Low

    Trouble Code Conditions: Engine runtime over 5 seconds, and the PCM detected the IAC Valve Closing Coil signal remained in a low state during the test.

    Possible Causes:



    IAC valve control signal is open
     
    IAC valve control signal is shorted to ground
     
    IAC valve is damaged or has failed
     
    PCM has failed (IAC "driver" circuit may be open in the PCM)
     

    Trouble Code: P1508

    IAC Valve Closing Coil Signal High

    Trouble Code Conditions: Engine runtime over 5 seconds, and the PCM detected the IAC Valve Closing Coil signal remained in a high state during the test.

    Possible Causes:



    IAC valve control signal is shorted to system power (B+)
     
    IAC valve is damaged or has failed
     
    PCM has failed (IAC "driver" circuit may be shorted in the PCM)
     

    Trouble Code: P1529

    Customer Snapshot Request Error

    Trouble Code Conditions: Engine started, engine running, and the PCM did not receive the Customer Request Snapshot Data (MIL and Freeze Frame Data) as requested from the Transmission Control Module (TCM).

    Possible Causes:



    Transmission control module error
     
    Check for trouble codes in the transmission control module
     
    TSB 1-40-005 (3/01) contains information about this code
     

    Trouble Code: P1586

    A/T To M/T Codification

    Trouble Code Conditions: Engine speed over 2200 rpm, and the PCM detected the A/T to M/T Codification input was "off" with the gear switch "on", or that the A/T to M/T Codification input was "on" with the gear switch input "off".

    Possible Causes:



    A/T to M/T codification input circuit is open
     
    A/T to M/T codification input circuit is shorted to ground
     
    A/T to M/T codification input circuit is VREF or system power
     
    PCM has failed
     

    Trouble Code: P1606

    Chassis Accelerator Sensor Signal Performance

    Trouble Code Conditions: Engine running and the PCM detected an unexpected voltage condition on the Chassis Accelerator sensor circuit during the test.

    Possible Causes:



    Chassis acceleration sensor signal circuit is open
     
    Chassis acceleration sensor signal circuit is shorted to ground
     
    Chassis acceleration sensor signal circuit is shorted to power
     
    Chassis acceleration sensor is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1611

    MIL Request Circuit Low Input

    Trouble Code Conditions: Key on or engine running, and the PCM detected the MIL Request circuit remained in a low state during the CCM test.

    Possible Causes:



    MIL request control circuit is shorted to sensor ground
     
    MIL request control circuit is shorted to chassis ground
     
    PCM is damaged
     

    Trouble Code: P1614

    MIL Request Circuit High Input

    Trouble Code Conditions: Key on or engine running, and the PCM detected the MIL Request circuit remained in a high state during the CCM test.

    Possible Causes:



    MIL request control circuit is shorted to system power (B+)
     
    MIL "bulb" circuit is open or missing
     
    PCM is damaged
     

    Trouble Code: P1624

    MIL Request Circuit (TCM To PCM) Circuit Malfunction

    Trouble Code Conditions: Key on or engine running and PCM detected a signal from the TCM indicating it had detected a problem in the MIL Request circuit.

    Possible Causes:



    Perform the related TCM diagnostics
     
    TCM may have failed
     

    Trouble Code: P1632

    Generator Battery Detection Circuit Malfunction

    Trouble Code Conditions: Engine running, and the PCM detected the Battery Detection circuit voltage was less than 8 volts during the CCM test.

    Possible Causes:



    Circuit C249-9 open between the Generator and the PCM
     
    Generator is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1673

    Cooling Fan Circuit Malfunction

    Trouble Code Conditions: Key on or the engine running and the PCM detected an unexpected voltage condition on the Fan control circuit during the CCM test. Note: The cooling fan relay pull-in coil resistance is 80 ohms at 68°F.

    Possible Causes:



    Cooling fan relay control circuit is open
     
    Cooling fan relay control circuit is shorted to ground
     
    Cooling fan relay is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1693

    Antenna Error

    Trouble Code Conditions: Passive mode invalid. Programming error.

    Possible Causes:



    Open or short in antenna or SMARTRA circuit
     
    Antenna
     
    SMARTRA
     
    Faulty transponder
     
    Faulty ECM
     

    Trouble Code: P1700

    Overdrive (O/D) Off Lamp Circuit Malfunction

    Trouble Code Conditions: Engine running and the PCM detected an unexpected voltage condition on the Overdrive Off Lamp circuit during the CCM test.

    Possible Causes:



    O/D "Off" lamp circuit is open between PCM and the TCM
     
    O/D "Off" lamp circuit is shorted to ground between the TCM and the PCM
     
    O/D "Off" lam circuit is shorted to system power between the TCM and the PCM
     

    Trouble Code: P1780

    Transmission Control Spark Advance Circuit Malfunction

    Trouble Code Conditions: Engine running and the PCM detected an unexpected circuit condition on the Transmission Controlled Spark Advance circuit.

    Possible Causes:



    Spark advance circuit is open between the TCM and the PCM
     
    Spark advance circuit shorted to ground between the TCM and the PCM
     
    TCM or the PCM has failed
     

    Trouble Code: P1797

    Clutch Pedal Switch Clutch Malfunction

    Trouble Code Conditions: Engine running, and the PCM did not detect a change in the Clutch switch signal for 33 seconds after the clutch was engaged and released.

    Possible Causes:



    Clutch pedal position switch signal circuit is open
     
    Clutch pedal position switch signal circuit is shorted to ground
     
    Clutch pedal position switch signal circuit is shorted to power
     
    Clutch pedal position switch is damaged or has failed
     
    PCM has failed
     

    Trouble Code: P1800

    Engine Torque Circuit Malfunction

    Trouble Code Conditions: Engine running, and the PCM detected an unexpected voltage condition on the Engine Torque Signal circuit during the CCM test.

    Possible Causes:



    Engine torque signal circuit is open between PCM and the TCM
     
    Engine torque signal circuit is shorted to ground between the TCM and the PCM
     
    Engine torque signal circuit is shorted to system power between the TCM and the PCM
     

     
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