Sierra, Silverado 2006-2007

8.1L V8 VIN G Std 7

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Trouble Code: P2067



Fuel Level Sensor 2 Circuit Low Voltage

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate when the DTC failed. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 

Trouble Code: P2067



Fuel Level Sensor 2 Circuit Low Voltage

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate when the DTC failed. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2068



Fuel Level Sensor 2 Circuit High Voltage

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate when the DTC failed. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 

Trouble Code: P2068



Fuel Level Sensor 2 Circuit High Voltage

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate when the DTC failed. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2101



Control Module Throttle Actuator Position Performance

Possible Causes:



Inspect for mechanical concerns 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.
 
Inspect the TAC module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a condition within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing an individual condition may correct more than one DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
 
For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2108



Throttle Actuator Control (TAC) Module Performance

Possible Causes:



Verify that the starting and charging systems are operating properly. Low system voltage can cause this DTC to set.
 
Inspect the TAC module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a condition within the TAC System, more than 1 TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing an individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
 

Trouble Code: P2120



Accelerator Pedal Position (APP) Sensor 1 Circuit

Possible Causes:



Inspect the throttle actuator control (TAC) module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a condition within the TAC System, more than 1 TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
 
For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2121



Accelerator Pedal Position (APP) Sensor 1 Performance

Possible Causes:



Inspect the throttle actuator control (TAC) module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a condition within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual condition may correct more than one DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
 
For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2125



Accelerator Pedal Position (APP) Sensor 2 Circuit

Possible Causes:



Inspect the throttle actuator control (TAC) module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a condition within the TAC System, more than 1 TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
 
For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2135



Throttle Position (TP) Sensor 1-2 Correlation

Possible Causes:



Inspect the throttle actuator control (TAC) module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a condition within the TAC System, more than 1 TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Remember this if you review the stored information in Capture Info.
 
If this DTC is determined to be intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

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 Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2610



Control Module Ignition Off Timer Performance

Trouble Code: P2610



Control module Ignition Off Timer Performance

Trouble Code: P2636



Fuel Transfer Pump Flow Insufficient

Trouble Code: P2A01



HO2S Circuit Bank 1 Sensor 2

Trouble Code: P2A04



HO2S Circuit Bank 2 Sensor 2

Trouble Code: U0001



High Speed CAN Communication Bus

Possible Causes:



This DTC cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with GMLAN Device. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
 
An intermittent condition is likely to be caused by a short on the GMLAN serial data circuits. Use the Scan Tool Does Not Communicate with GMLAN Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
 

Trouble Code: U0073



Controller Area Network (CAN) Bus Communication

Possible Causes:



This DTC cannot be retrieved with a current status. Diagnosis of a current DTC is accomplished via the symptom Scan Tool Does Not Communicate with High Speed GMLAN Device .
 
An intermittent condition is likely to be caused by a short on the GMLAN serial data circuits. Use the DMM MIN/MAX function to capture/locate intermittent conditions.
 

Trouble Code: U0073



High Speed CAN Communication Bus

Trouble Code: U0100



Lost Communication With Engine Control Module (ECM)

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0100



Lost Communication With Engine Control Module (ECM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0101



Lost Communication With Transmission Control Module (TCM)

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0106



Lost Communication With Glow Plug Control Module (GPCM)

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0107



Lost Communication with Throttle Actuator Control (TAC) Module

Possible Causes:

Important: Reprogramming the PCM may cause a communication error between the PCM and the TAC. If the PCM detects a communication error, DTC U0107 sets. Clear any DTCs from the memory that may have been set by Reprogramming.



DTC U0107 sets if the battery voltage is low. If the customer's concern is slow cranking or no crank because battery voltage is low, ignore DTC U0107. Clear any DTCs from memory that may have set from the low battery voltage condition.
 
DTC U0107 sets when there is a short to B+ on the TAC module ground circuit. Inspect the fuses for the circuits that are in the TAC module harness--i.e. cruise, brake. An inspection of the fuses may lead you to the circuit that is shorted to the TAC module ground circuit.
 
DTC U0107 sets if the TAC module ignition feed circuit is shorted to a B+ supply circuit. The TAC module stays powered-up when the ignition switch is turned OFF. When the ignition switch is turned ON, the TAC module is powered-up before the PCM. DTC U0107 sets because no communication is detected by the TAC module from the PCM. Inspect related circuits for being shorted to a B+ supply circuit.
 
Inspect the TAC module power and ground circuits and the TAC module/PCM serial data circuits for intermittent connections.
 
Inspect the TAC module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
 
When the TAC module detects a problem within the TAC System, more than one TAC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing an individual condition may correct more than one DTC. Remember this if you review the stored information in Capture Info.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: U0111



Lost Communication With Energy Storage Control Module (ESCM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0120



Lost Communication With Starter/Generator Control Module (SGCM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0131



Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0293



Lost Communication With Hybrid Control Module (HCM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0299



N/A

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0299



N/A

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U1000



Class 2 Data Link Malfunction

Possible Causes:



When a malfunction occurs while modules are communicating, a lost communication DTC is set as a current DTC. When the modules stop communicating the current lost communication DTC 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 U1000 is set current by the other modules. If the malfunction occurs when the modules are not communicating, only U1000 is set.
 

Trouble Code: U1001



Serial Data Communications Failure

Possible Causes:



An intermittent open between a module and a star connector may cause this DTC to set.
 
A poor connection at a module or a star connector may cause this DTC to set.
 
An intermittent open in a star connector may cause this DTC to set.
 
An open voltage or ground circuit to a module may cause this DTC to set.
 
An internal module malfunction may cause this DTC to set.
 

Trouble Code: U1254



Lost Communication with XXX

Possible Causes:



An intermittent open between a module and a star connector may cause this DTC to set.
 
A poor connection at a module or a star connector may cause this DTC to set.
 
An intermittent open in a star connector may cause this DTC to set.
 
An open voltage or ground circuit to a module may cause this DTC to set.
 
An internal module malfunction may cause this DTC to set.
 

Trouble Code: U1300



Class 2 Data Link Low

Possible Causes:



These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .
 
An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .
 

Trouble Code: U1301



Class 2 Data Link High

Possible Causes:



These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .
 
An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .
 

Trouble Code: U1305



Class 2 Data Link Low or High

Possible Causes:



These DTCs cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with a Class 2 Device. Refer to Scan Tool Does Not Communicate with Class 2 Device .
 
An intermittent condition is likely to be caused by a short on the class 2 serial data circuit. Use the Scan Tool Does Not Communicate with a Class 2 Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with Class 2 Device .
 

Trouble Code: U1500



Inter-Device Dedicated Bus Malfunction

Possible Causes:



The diagnostic procedure used for DTC U1500 in OnStar® systems with single module generations of OnStar® differ greatly from previous generations with 2 modules. While these older generations denoted a failure of the 3-wire bus between the modules by setting a U1500, single module OnStar® systems use this DTC to denote an internal module failure. The determination of whether a one or 2-module generation of OnStar® is used should be confirmed. Refer to OnStar Description and Operation .
 
This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the VCIM.
 
If this DTC is retrieved as both a current and history DTC, replace the VCIM.
 

Trouble Code: U1881



Electro-Hydraulic Power Steering (EHPS) Module Lost Communication With Energy Storage Control Module (ESCM)

Possible Causes:

Important:



For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.
 
DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.
 
An intermittent open between a module and a star connector may cause this DTC to set.
 
An intermittent open on high speed GMLAN may cause this DTC to set.
 
An open voltage or ground circuit to a module may cause this DTC to set.
 
An internal module malfunction may cause this DTC to set.
 

Trouble Code: U1882



Energy Storage Control Module (ESCM) Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module

Possible Causes:

Important:



For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.
 
DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.
 
An intermittent open between a module and a star connector may cause this DTC to set.
 
An intermittent open on high speed GMLAN may cause this DTC to set.
 
An open voltage or ground circuit to a module may cause this DTC to set.
 
An internal module malfunction may cause this DTC to set.
 

Trouble Code: U1883



Hybrid Control Module (HCM) Lost Communication With Driver Door Module (DDM)

Possible Causes:

Important:



For DTC U1892, ensure all power and ground circuits to the electric-hydraulic power steering (EHPS) module including the motor are tested. A loss of voltage or ground to the EHPS hydraulic motor as well as to the module may cause a loss of communication.
 
DTCs U1883 and U1884 can be set inadvertently, when braking during the trailer towing. If only these codes are set as history only, clear the codes.
 
An intermittent open between a module and a star connector may cause this DTC to set.
 
An intermittent open on high speed GMLAN may cause this DTC to set.
 
An open voltage or ground circuit to a module may cause this DTC to set.
 
An internal module malfunction may cause this DTC to set.
 

 
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