Sierra, Silverado 2006-2007

6.0L V8 VIN U Auto 9

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Trouble Code: P1A79



Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage

Trouble Code: P1A7A



Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage

Trouble Code: P1A7E



Starter/Generator Control Module Overtemperature High Voltage System Disabled

Possible Causes:



If there is a restriction of the air flow through the radiator this DTC may set. Ensure that the vehicle front end has at least 1.5 meters (5 feet) of clearance from obstructions to airflow if vehicle is parked.
 

Trouble Code: P1A7F



Starter/Generator Control Module Coolant Level Sensor 1 Low Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A80



Starter/Generator Control Module Coolant Level Sensor 1 High Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A81



Starter/Generator Control Module Coolant Level Sensor 2 Low Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A82



Starter/Generator Control Module Coolant Level Sensor 2 High Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A83



Starter/Generator Control Module Coolant Level Sensor 3 Low Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A84



Starter/Generator Control Module Coolant Level Sensor 3 High Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A85



Starter/Generator Control Module Coolant Level Sensor 4 Low Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A86



Starter/Generator Control Module Coolant Level Sensor 4 High Voltage

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A87



Low Starter/Generator Control Module Coolant Level

Possible Causes:



If the vehicle is on an extreme angle this DTC may set.
 

Trouble Code: P1A93



14-Volt Power Module Stuck OFF

Trouble Code: P1A94



14-Volt Power Module Stuck ON

Trouble Code: P1A95



DC/DC Converter Stuck in 14-42 Volt Direction

Trouble Code: P1A96



DC/DC Converter Stuck in 42-14 Volt Direction

Trouble Code: P1A97



Starter/Generator Control Module Hybrid Battery Voltage Sensor Circuit Low Voltage

Trouble Code: P1A98



Starter/Generator Control Module Hybrid Battery Voltage Sensor Circuit High Voltage

Trouble Code: P1A99



Starter/Generator Control Module Hybrid Battery Current Sensor Circuit Low Current

Trouble Code: P1A9A



Starter/Generator Control Module Hybrid Battery Current Sensor Circuit Low Current

Trouble Code: P1AA9



Starter/Generator Phase U Current Sensor Performance

Trouble Code: P1AAA



Starter/Generator Phase W Current Sensor Performance

Trouble Code: P1AAB



Starter/Generator Phase U Circuit

Trouble Code: P1AAC



Starter/Generator Phase V Circuit

Trouble Code: P1AAD



Starter/Generator Phase W Circuit

Trouble Code: P1AAE



Starter/Generator Phase U-V-W Correlation

Trouble Code: P1AB2



Hybrid System Voltage

Trouble Code: P1AC0



Starter/Generator Control Module Output Circuit

Trouble Code: P1AC1



Starter/Generator Control Module Cooling Fan Relay Control Circuit Low Voltage

Possible Causes:



If condition is not present, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1AC2



Starter/Generator Control Module Cooling Fan Relay Control Circuit High Voltage

Possible Causes:



If condition is not present, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1AC8



N/A

Trouble Code: P1AC9



HCM Service Calibration Fault

Possible Causes:



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 module.
 
If this DTC is retrieved as both a current and history DTC, reprogram the module.
 

Trouble Code: P2066



Fuel Level Sensor 2 Performance

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: P2066



Fuel Level Sensor 2 Performance

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: 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 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.
 

 
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