Canyon, Colorado 2006-2007

2.9L L4 VIN 9 Auto 5

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Trouble Code: P2122



Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

Trouble Code: P2123



Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

Trouble Code: P2125



Accelerator Pedal Position (APP) Sensor 2 Circuit

Trouble Code: P2127



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Trouble Code: P2128



Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

Trouble Code: P2135



Throttle Position (TP) Sensor 1-2 Correlation

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Trouble Code: P2270



HO2S Signal Stuck Lean Sensor 2

Trouble Code: P2271



HO2S Signal Stuck Rich Sensor 2

Trouble Code: P2430



Secondary Air Injection (AIR) System Pressure Sensor Circuit

Trouble Code: P2431



Secondary Air Injection System Pressure Sensor A Circuit Range/Performance

Trouble Code: P2432



Secondary Air Injection System Pressure Sensor A Circuit Low

Trouble Code: P2433



Air Injection System Pressure Sensor A Circuit High

Trouble Code: P2440



Secondary Air Injection (AIR) System Valve Stuck Open

Trouble Code: P2444



Secondary Air Injection (AIR) System Pump Stuck On

Trouble Code: P2534



Ignition 1 Switch Circuit Low Voltage

Possible Causes:



If all circuit tests are OK, ensure the transmission pass through connector and harness terminals are clean and not damaged, and the charging system is functioning correctly.
 
Verify there is a good connection at the body control module (BCM) especially if DTC P0700 is also set with this code.
 

Trouble Code: P2544



Transmission Torque Request Circuit

Possible Causes:



This diagnostic trouble code may set due to low system voltage. Ensure that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test . Verify charging system is operating correctly. Refer to Charging System Test . Verify there is no parasitic drain on the battery. Refer to Battery Electrical Drain/Parasitic Load Test .
 

Trouble Code: P2610



Control Module Ignition Off Timer Performance

Trouble Code: P2763



Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit High Voltage

Trouble Code: P2764



Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage

Trouble Code: P2769



Torque Converter Clutch (TCC) Enable Solenoid Control Circuit Low Voltage

Trouble Code: P2770



Torque Converter Clutch (TCC) Enable Solenoid Control Circuit High Voltage

Trouble Code: P2771



Four Wheel Drive (4WD) Low Switch Circuit

Possible Causes:

A malfunctioning speed sensor could cause DTC P2771 to set.



Verify that the input speed sensor (ISS) and the OSS are functioning properly.
 
In 3rd gear at approximately 64 km/h (40 mph), command TCC ON. If functioning properly the OSS will track ISS and the engine RPM. If not refer to DTC P0716 for the ISS and DTC P0723 for the OSS.
 
If the speed sensors pass testing, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2A00



HO2S Circuit Closed Loop (CL) Performance Sensor 1

Trouble Code: U1000



Class 2 Data Link

Possible Causes:



If a malfunction such as an open fuse to a module occurs while serial data communication is active, a Lost Communication DTC for the specific module is set as a current DTC in other modules. When all serial data communication becomes inactive, the current Lost Communication DTC is cleared, but the history DTC remains. When serial data communication resumes, the module with the open fuse will not be learned by the other modules, so DTC U1000 or U1255 is set as current by the other modules. In the event of a malfunction occurrence while serial data communication is inactive, DTC U1000 or U1255 is set without a loss of communication DTC for the specific module.
 

Trouble Code: U1001



Lost Communication with XXX

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1016



Lost Communication With ECM/PCM

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1017



Lost Communication With Engine Control Module

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1024



Lost Communication With Transmission Control Module

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1026



Lost Communication With ATC/TCCM

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1040



Lost Communication With Electronic Brake Control Module

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1041



Lost Communication With Electronic Brake Control Module

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1064



Lost Communication With Body Control Module (BCM)

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1088



Lost Communication With Sensing and Diagnostic Module (SDM)

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1096



Loss of IPC Communications

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1097



Loss of DIC Communications

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1098



Loss of HUD Communications

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1099



Loss of HUD Communications

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1111



Lost Communication With Chime Module

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

Trouble Code: U1128



Loss of IRC Communications

Possible Causes:



Use the DTC Descriptor list above to determine the module which is not communicating.
 
Some modules may not have internal protection for specific voltage outputs and may open a battery positive voltage or ignition voltage source fuse. If a voltage input fuse is open and no short is found in that circuit, ensure that no module output voltage circuit is shorted to ground before replacing the module.
 
This diagnostic can be used for any module that should communicate with Class 2 serial data providing the vehicle is equipped with the option that uses that module.
 

 
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