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    Canyon, Colorado 2006-2007

    2.8L L4 VIN 8 Std 4

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    Trouble Code: P1545



    A/C Relay Output Circuit Malfunction

    Trouble Code: P1574



    Cruise Control Brake Release Transition Malfunction

    Possible Causes:



    Inspect for proper adjustment of the cruise release switch. Refer to Cruise Release Switch Adjustment .
     
    Refer to Exterior Lighting Systems Description and Operation in Lighting Systems In order to avoid a misdiagnosis.
     
    For an intermittent condition, refer to Testing for Intermittent and Poor Connections in Wiring Systems.
     

    Trouble Code: P1600



    Long Term Memory Reset

    Trouble Code: P1621



    Long Term Memory Performance

    Trouble Code: P1626



    Class 2 Serial Data Circuit

    Trouble Code: P1627



    Analog to Digital Performance

    Trouble Code: P1630



    Theft Deterrent System Password Learn Mode Malfunction

    Possible Causes:



    A new replacement ECM will be in a functional state to learn the password from the BCM. If the BCM is replaced, the ECM must be placed in password learning mode to relearn a new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of ECM battery or ignition voltage will not affect the programmed password information.
     

    Trouble Code: P1631



    No Valid Fuel Disable Password

    Possible Causes:



    DTC P1631 indicates that the vehicle theft deterrent password that the ECM has learned does not agree with the password received from the VTD system. This condition can occur if an incorrect key is used when attempting to start the vehicle, or if the BCM has been replaced and the ECM Password Learn function has not been enabled. If the BCM has been replaced, the password must be relearned.
     

    Trouble Code: P1680



    Accelerator Pedal Position (APP) Performance

    Trouble Code: P1681



    Throttle Position (TP) System Performance

    Trouble Code: P1682



    TAC System Voltage Supply Circuit Malfunction

    Trouble Code: P1683



    Ignition Off Timer Performance

    Trouble Code: P1689



    EBCM Invalid Delivered Torque Signal

    Possible Causes:



    Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Electrical Intermittents , Testing for Intermittent and Poor Connections , Connector Repairs and Wiring Repairs in Wiring Systems.
     

    Trouble Code: P1810



    Transmission Pressure Switch Manifold Circuit Malfunction

    Possible Causes:



    Refer to the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic table for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
     
    Inspect the connectors at the PCM, the TFP manual valve position switch and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
     
    Sediment in the valve body may cause improper operation of the TFP manual valve position switch. If sediment intrusion is suspected, clean the valve body and replace the TFP manual valve position switch.
     

    Trouble Code: P1815



    TFP Manual Valve Position Switch Circuit Malfunction

    Trouble Code: P1816



    TFP Manual Valve Position Switch Circuit Malfunction

    Trouble Code: P1862



    TCC Solenoid Circuit Malfunction

    Possible Causes:



    With the TCC engaged, the TCC slip speed should be -20 to +50 RPM.
     

    Trouble Code: P1863



    TCC Solenoid Circuit Short to Voltage

    Possible Causes:



    Inspect the connectors at the PCM, the TCC enable solenoid valve, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
     
    Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Wiring Systems.
     
    Inspect for a disconnected TCC enable solenoid valve connector.
     
    Inspect for an open TCC enable solenoid valve circuit.
     
    Inspect for a faulty TCC enable solenoid valve.
     
    Inspect for a PCM internal fault.
     

    Trouble Code: P2101



    Throttle Position Miscalibration

    Possible Causes:

    The throttle valve is spring loaded to a slightly open position. The throttle valve should be open approximately 20 percent. This is referred to as the rest position. The throttle valve should not be completely closed nor should they be open any more than the specified amount. The throttle valve should move open and to the closed position without binding under the normal spring pressure. The throttle should NOT be free to move open or closed WITHOUT spring pressure. Replace the throttle body if any of these conditions are found. Important: Operating the throttle blade with the Throttle Blade Control function of the scan tool may cause additional DTCs to set. DO NOT attempt to diagnose DTCs set during this function. The scan tool has the ability to operate the throttle control system using Special Functions. Actuate the throttle valve using the throttle blade control function located in the throttle actuator control (TAC) System menu. This function will operate the throttle valve through the entire range in order to determine if the throttle body and system operate correctly. Inspect for the following conditions:



    Use the J 35616 Connector Test Adapter Kit for any test that requires probing the PCM harness connector or a component harness connector.
     
    Poor connections at the PCM or at the component--Inspect the harness connectors for a poor terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems for the proper procedure.
     
    For intermittents, refer to Intermittent Conditions .
     

    Trouble Code: P2119



    Throttle Position Miscalibration Between Commanded and Actual States

    Possible Causes:



    If you do not find any trouble, inspect for mechanical conditions or binding that may be temperature related. Components may not move freely in extreme heat or cold due to the presence of contaminants or ice formation.
     

    Trouble Code: P2120



    APP Sensor 1 Circuit Malfunction

    Trouble Code: P2125



    APP Sensor 2 Circuit Malfunction

    Trouble Code: P2135



    TP Sensor 1 and Sensor 2 Signal Malfunction

    Possible Causes:



    If the DTC is determined to be intermittent, refer to Intermittent Conditions .
     

    Trouble Code: P2138



    APP Sensor 1 and Sensor 2 Signal Malfunction

    Possible Causes:



    The PCM compares the signal of each of the accelerator pedal position sensor to each other throughout the entire range of operation. Clear the DTCs and actuate the pedal through the entire range with the ignition ON and the engine OFF. Use the J 35616 Connector Test Adapter Kit for any test that requires probing the PCM harness connector or a component harness connector. Using this kit will prevent damage to the harness connector terminals. For intermittent conditions, refer to Intermittent Conditions .
     

    Trouble Code: P2176



    Throttle Position Calibration Malfunction

    Possible Causes:

    The throttle valve is spring loaded to a slightly open position. The throttle valve should be open approximately 20 percent. This is referred to as the rest position. The throttle valve should not be completely closed nor should it be open any more than the specified amount. The throttle valve should move open and to the closed position without binding under the normal spring pressure. The throttle should NOT be free to move open or closed WITHOUT spring pressure. Replace the throttle body if any of these conditions are found. Important: Operating the throttle blade with the Throttle Blade Control function of the scan tool may cause additional DTCs to set. Do not attempt to diagnose DTCs set during this function. The scan tool has the ability to operate the throttle control system using Special Functions. Actuate the throttle valve using the throttle blade control function located in the TAC System menu. This function will operate the throttle valve through the entire range in order to determine if the throttle body and system operate correctly. Check for the following conditions:



    Use the J 35616 Connector Test Adapter Kit for any test that requires probing the PCM harness connector or a component harness connector.
     
    Poor connections at the PCM or at the component--Inspect the harness connectors for a poor terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems for the proper procedure.
     
    For intermittent conditions, refer to Intermittent Conditions .
     

    Trouble Code: P2610



    Ignition Off Timer Performance

    Trouble Code: P2763



    TCC PWM Solenoid Circuit Malfunction

    Trouble Code: P2764



    TCC PWM Solenoid Circuit Malfunction

    Trouble Code: P2771



    4WD Low Circuit Malfunction

    Trouble Code: U1000



    Class 2 Data Link

    Possible Causes:



    When a malfunction such as an open fuse to a module occurs while modules are communicating, a DTC U1001-1254 Loss of Communications is set. When the modules stop communicating,the current DTC U1001-1254 Loss of Communications is cleared but the history DTC remains. When the modules begin to communicate again, the module with the open fuse will not be learned by the other modules so DTC U1000 or U1255 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only DTC U1000 or U1255 is set.
     

    Trouble Code: U1001



    Lost Communication with XXX

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1016



    Lost Communications With Powertrain Control Module (PCM)

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1026



    Lost Communications With Transfer Case Control Module (TCCM)

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1041



    Lost Communications With Electronic Brake Control Module (EBCM)

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1064



    Lost Communications With Body Control Module (BCM)

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1088



    Lost Communications With Sensing and Diagnostic Module (SDM)

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1096



    Lost Communications With Instrument Panel Cluster (IPC)

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1128



    Lost Communications With Radio

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1136



    Lost Communications With Digital Audio Broadcast

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

    Trouble Code: U1151



    Lost Communications With OnStar

    Possible Causes:

    The following conditions may cause this DTC to set:



    An intermittent open between a module and a star connector
     
    A poor connection at a module or a star connector
     
    An intermittent open in a star connector
     
    An open voltage or ground circuit to a module
     
    An internal module malfunction
     



    1. Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
     
    2. The DTC which is reported the most times.
     
    3. From the lowest number DTC to the highest number DTC.
     

     
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