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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