Avalanche, Express, Savana 2006-2007

8.1L V8 VIN G Auto 4

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Trouble Code: P0712



Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage

Possible Causes:



DTC P0712 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0712



Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage

Possible Causes:



The scan tool displays the transmission fluid temperature in degrees. After the transmission is operating, the fluid temperature should rise steadily to a normal operating temperature, then stabilize.
 
Verify the customer's driving habits, trailer towing, etc. Trailer towing should occur in D3.
 

Trouble Code: P0713



Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage

Possible Causes:



DTC P0713 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0713



Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage

Trouble Code: P0716



Input Speed Sensor Performance

Possible Causes:



DTC P0716 defaults to an elevated line pressure condition which may result in partial torque converter clutch (TCC) apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0717



Input Speed Sensor Circuit Low Voltage

Possible Causes:



DTC P0717 defaults to an elevated line pressure condition which may result in partial torque converter clutch (TCC) apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0719



Brake Switch Circuit Low Voltage

Possible Causes:



Inspect the brake switch for proper mounting and operation.
 
Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0719.
 

Trouble Code: P0719



Brake Switch Circuit Low Voltage

Possible Causes:



Inspect the brake switch for proper mounting and operation.
 

Trouble Code: P0724



Brake Switch Circuit High Voltage

Possible Causes:



Inspect the brake switch for proper mounting and operation.
 
Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0724.
 

Trouble Code: P0724



Brake Switch Circuit High Voltage

Possible Causes:



Inspect the brake switch for proper mounting and operation.
 

Trouble Code: P0730



Incorrect Gear Ratio

Possible Causes:



A false or incorrect AT OSS or AT ISS signal can set DTC P0730.
 
DTC P0894 detects an incorrect gear ratio in fourth gear with the torque converter clutch (TCC) applied.
 
Inspect for any improperly installed aftermarket equipment.
 
Sticking or contamination of shift valves may cause intermittent incorrect gear ratios.
 
Refer to Shift Solenoid Valve State and Gear Ratio .
 
DTC P0730 defaults to an elevated line pressure which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0740



Torque Converter Clutch (TCC) Enable Solenoid Control Circuit

Possible Causes:



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

Trouble Code: P0741



Torque Converter Clutch (TCC) System - Stuck Off

Possible Causes:



Residue or contamination may cause TCC hydraulic valves to stick intermittently.
 
DTC P0741 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0741



Torque Converter Clutch (TCC) System - Stuck Off

Possible Causes:



Contamination may cause the TCC apply valve to stick in the valve body.
 
There may be internal damage in the torque converter causing the no TCC apply.
 

Trouble Code: P0742



Torque Converter Clutch (TCC) System - Stuck On

Possible Causes:



If the TCC is mechanically stuck ON with the parking brake applied and any gear range selected, the TCC fluid mechanically applies the TCC. TCC fluid mechanically applying the TCC can cause an engine stall.
 
DTC P0742 defaults to an elevated line pressure which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 
A stuck throttle position sensor may set a DTC P0742.
 

Trouble Code: P0742



Torque Converter Clutch (TCC) System - Stuck On

Possible Causes:

The TCC fluid hydraulically applies the TCC, possibly causing an engine stall, under the following conditions:



The TCC is hydraulically stuck ON
 
The parking brake is applied
 
Any gear range is selected
 

Trouble Code: P0748



Pressure Control (PC) Solenoid Control Circuit

Possible Causes:



Inspect the PC solenoid wiring for aftermarket products designed to alter transmission line pressure.
 
DTC P0748 defaults to an elevated line pressure condition which may result in partial torque converter clutch (TCC) apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0748



Pressure Control (PC) Solenoid Control Circuit

Possible Causes:



DTC P0748 may set under low voltage conditions caused by high electrical system demands.
 

Trouble Code: P0751



1-2 Shift Solenoid Valve Performance - No First or Fourth Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur.
 
Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0751



1-2 Shift Solenoid Valve Performance - No First or Fourth Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed table. Refer to Shift Speed .
 
Other internal transmission failures may cause incorrect gear ratios to occur. Refer to Shift Solenoid Valve State and Gear Ratio .
 
DTC P0751 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0752



1-2 Shift Solenoid Valve Performance - No Second or Third Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur.
 
Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0752



1-2 Shift Solenoid Valve Performance - No Second or Third Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed table. Refer to Shift Speed .
 
Other internal transmission failures may cause incorrect gear ratios to occur. Refer to Shift Solenoid Valve State and Gear Ratio .
 
DTC P0752 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0753



1-2 Shift Solenoid Control Circuit

Possible Causes:



An open ignition feed on the Off/Run/Crank voltage circuit can cause multiple DTCs to set. Refer to Shift Solenoid Valve State and Gear Ratio .
 
DTC P0753 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0753



1-2 Shift Solenoid Control Circuit

Possible Causes:



Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0756



2-3 Shift Solenoid Valve Performance - No First or Second Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur.
 
Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0756



2-3 Shift Solenoid Valve Performance - No First or Second Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed table. Refer to Shift Speed .
 
Other internal transmission failures may cause incorrect gear ratios to occur.
 
The customer may have concern of an engine over-rev condition or neutral condition in 4th gear. Refer to Shift Solenoid Valve State and Gear Ratio .
 
DTC P0756 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0757



2-3 Shift Solenoid Valve Performance - No Third or Fourth Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur. Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0757



2-3 Shift Solenoid Valve Performance - No Third or Fourth Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed table. Refer to Shift Speed .
 
Other internal transmission failures may cause incorrect gear ratios to occur in 3rd gear.
 
The customer may have concern of an engine over-rev condition or neutral condition in 4th gear. Refer to Shift Solenoid Valve State and Gear Ratio .
 
DTC P0757 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0758



2-3 Shift Solenoid Control Circuit

Possible Causes:



DTC P0758 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine. Refer to Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0758



2-3 Shift Solenoid Control Circuit

Possible Causes:



Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0785



3-2 Shift Solenoid (SS) Control Circuit

Trouble Code: P0802



Transmission Control Module (TCM) MIL Request Circuit

Trouble Code: P0856



Traction Control Torque Request Circuit

Possible Causes:

C0298 A requested torque signal malfunction is only one possible cause for the PCM to lose the ability to perform traction control. DTC C0298 may set due to engine overheating, throttle actuator control failure, loss of ignition timing control by the PCM, etc. If DTC P0856 has not set, refer to the following in order to identify other possible causes of DTC C0298:



Symptoms - Engine Controls for the 4.3L engine
 
Symptoms - Engine Controls for the 8.1L engine
 
Symptoms - Engine Controls for the 4.8L, 5.3L, and 6.0L engines
 
Symptoms - Engine Controls for the 6.6L (LBZ and LLY) engine
 



Testing for Electrical Intermittents
 
Testing for Intermittent Conditions and Poor Connections
 
Connector Repairs
 
Wiring Repairs
 

Trouble Code: P0894



Transmission Component Slipping

Possible Causes:



A TFP manual valve position switch malfunction can set DTC P0894.
 
A mechanical failure of the shift solenoids or TCC PWM solenoid valve can set DTC P0894.
 
Internal transmission failures can result in a DTC P0894.
 
Sticking or contaminated shift valves may cause intermittent slipping in D4.
 
DTC P0894 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
 

Trouble Code: P0894



Transmission Component Slipping

Possible Causes:



Bronze material found in the transmission oil pan may indicate stator shaft bushing wear. If bushing wear is suspected, inspect the stator shaft and the input, turbine, shaft for damage.
 
Refer to Symptoms - Automatic Transmission for more information.
 

Trouble Code: P0A0A



High Voltage System Interlock Circuit

Possible Causes:



Ensure that all connectors are connected properly.
 

Trouble Code: P1125



Accelerator Pedal Position (APP) System

Possible Causes:



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.
 
The APP sensor 1 and the throttle position (TP) sensor 1 5-volt reference circuits are internally connected within the TAC module.
 
The APP sensor 2 and the TP sensor 2 5-volt reference circuits are internally connected within the TAC module.
 
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. Remember this if you review the information stored in Captured Info.
 
For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1133



HO2S Insufficient Switching Bank 1 Sensor 1

Trouble Code: P1134



HO2S Transition Time Ratio Bank 1 Sensor 1

Trouble Code: P1153



HO2S Insufficient Switching Bank 2 Sensor 1

 
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