Envoy, Rainer, Trailblazer 2006-2007

5.3L V8 VIN M Auto 10

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Trouble Code: P1815



Transmission Fluid Pressure (TFP) Valve Position Switch - Start in Wrong Range

Possible Causes:



Refer to the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
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



Transmission Fluid Pressure (TFP) Valve Position Switch - Start in Wrong Range

Possible Causes:



Refer to the Transmission Fluid Pressure Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
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: P1816



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Park/Neutral (P/N) with Drive Ratio

Possible Causes:



Refer to the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
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: P1816



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Park/Neutral (P/N) with Drive Ratio

Possible Causes:



Refer to the Transmission Fluid Pressure Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
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: P1818



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Drive without Drive Ratio

Possible Causes:



Refer to the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
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: P1818



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Drive without Drive Ratio

Possible Causes:



Refer to the Transmission Fluid Pressure Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
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: P2101



Control Module Throttle Actuator Position Performance

Possible Causes:

The throttle valve are 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. Check for the following conditions:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the engine control module (ECM) harness connector or a component harness connector.
 
Poor connections at the ECM or at the component--Inspect the harness connectors for a poor terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections for the proper procedure.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2101



Throttle Actuator Position Performance

Trouble Code: P2119



Throttle Closed Position Performance

Possible Causes:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
 
Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close. Observe the Freeze Frame/Failure Records.
 
The throttle valve is spring loaded to a slightly open position. The throttle valve should be open approximately 15-20 percent. This is referred to as the rest position.
 
The throttle valve should not be completely closed or open any more than a 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.
 
The scan tool has the ability to operate the throttle control system using the TP function located in the TAC System menu. This function operates the throttle valve through the entire range in order to determine if the throttle actuator control (TAC) system operates correctly.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2119



Throttle Closed Position Performance

Trouble Code: P2120



Accelerator Pedal Position (APP) Sensor 1 Circuit

Trouble Code: P2122



Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

Possible Causes:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
 
If DTCs P0700, P2122, P2128, and P2138 are set together in various combinations, inspect the APP sensor 1 and 2 signal circuits for being shorted together.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2122



Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

Trouble Code: P2123



Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

Possible Causes:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

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

Possible Causes:



Use the J 35616 Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

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: P2176



Minimum Throttle Position Not Learned

Possible Causes:

The throttle valve is spring loaded to a slightly open position. The throttle valve should be open approximately 20-25 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 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 ECM harness connector or a component harness connector.
 
Poor connections at the ECM or at the component--Inspect the harness connectors for a poor terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections for the proper procedure.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2176



Minimum Throttle Position Not Learned

Trouble Code: P2270



HO2S Signal Stuck Lean Bank 1 Sensor 2

Trouble Code: P2271



HO2S Signal Stuck Rich Bank 1 Sensor 2

Trouble Code: P2272



HO2S Signal Stuck Lean Bank 2 Sensor 2

Trouble Code: P2273



HO2S Signal Stuck Rich Bank 2 Sensor 2

Trouble Code: P2534



Ignition 1 Switch Circuit Low Voltage

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: 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

Possible Causes:



With the TCC engaged, the TCC slip speed should be -20 to +40 RPM.
 

Trouble Code: P2770



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

Trouble Code: P2771



Four Wheel Drive (4WD) Low Switch Circuit

Trouble Code: P2771



Four Wheel Drive (4WD) Low Switch Circuit

Possible Causes:



Verify that the input speed sensor (ISS) and the output speed sensor (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.
 

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 1 Sensor Circuit

 
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