Envoy, Rainer, Trailblazer 2006-2007

5.3L V8 VIN M Auto 8

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Trouble Code: P0716



Input Speed Sensor Performance

Possible Causes:



Inspect the connectors at the TCM, the AT ISS, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections .
 
Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents .
 
Road test the vehicle while monitoring the Transmission ISS parameter on the scan tool. The Transmission ISS parameter should vary with engine speed changes and not abruptly drop out.
 
Inspect for an open or shorted AT ISS wire.
 
Inspect for a disconnected AT ISS connector.
 
Inspect for a faulty AT ISS.
 

Trouble Code: P0717



Input Speed Sensor Circuit Low Voltage

Possible Causes:



Inspect the connectors at the TCM, the AT ISS, and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections .
 
Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents .
 
Road test the vehicle while monitoring the Transmission ISS parameter on the scan tool. The Transmission ISS parameter should vary with engine speed changes and not abruptly drop out.
 
Inspect for an open or shorted AT ISS wire.
 
Inspect for a disconnected AT ISS connector.
 
Inspect for a faulty AT ISS.
 

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.
 
Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0719.
 
It may be necessary to also clear this DTC from the ECM.
 

Trouble Code: P071A



Transmission Tow Mode Switch Circuit

Possible Causes:



If the electrical circuit tests are OK and the shift pattern is not occurring, there may be a mechanical/hydraulic condition that prevents operation. Refer to Symptoms - Automatic Transmission .
 

Trouble Code: P0722



Output Speed Sensor Circuit Low Voltage

Possible Causes:



Inspect the rear internal gear teeth for damage.
 
Visually inspect the VSS for cracks or damage.
 
Ensure the VSS is properly torqued to the transmission housing.
 

Trouble Code: P0723



Output Speed Sensor Circuit Intermittent

Possible Causes:



Inspect the rear internal gear teeth for damage.
 
Visually inspect the VSS for cracks or damage.
 
Ensure the VSS is properly torqued to the transmission housing.
 

Trouble Code: P0723



Output Speed Sensor Circuit Intermittent

Possible Causes:



Inspect the rear internal gear teeth for damage.
 
Visually inspect the OSS for cracks or damage.
 
Ensure the OSS is properly torqued to the transmission housing.
 

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.
 
Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0724.
 
It may be necessary to also clear this DTC from the ECM.
 

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.
 
It may be necessary to also clear this DTC from the engine control module (ECM).
 

Trouble Code: P0741



Torque Converter Clutch (TCC) System - Stuck Off

Possible Causes:



Inspect the transmission fluid lines to the radiator. The lines may be pinched, plugged or twisted.
 
Contamination may cause the TCC apply valve to stick in the valve body.
 
Internal damage to the torque converter may prevent TCC application.
 

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.
 
Contamination may cause the TCC apply valve to intermittently stick in the valve body.
 
Internal damage in the torque converter may cause no TCC apply.
 

Trouble Code: P0751



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

Possible Causes:



If you clear DTC P0751, and then cannot reset DTC P0751, the following conditions may exist:

Fluid contamination
 
Plugged fluid circuits
 
Restricted fluid circuits
 

Refer to Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0751



1-2 Shift Solenoid (SS) Valve Performance - No First, Fourth or Fifth Gear

Possible Causes:

If the DTC is cleared, then will not reset when the vehicle is driven, some of the following conditions may exist:



Fluid contamination
 
Plugged fluid circuits
 
Restricted fluid circuits
 
Inspect transmission fluid lines to radiator. Lines may be pinched, plugged or twisted.
 
Refer to Shift Solenoid Valve State and Gear Ratio .
 
Internal damage to the torque converter may prevent TCC application.
 

Trouble Code: P0752



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

Possible Causes:



If you clear DTC P0752, and then cannot reset DTC P0752, the following conditions may exist:

Fluid contamination
 
Plugged fluid circuits
 
Restricted fluid circuits
 

Refer to Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0752



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

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.
 
Contamination may cause the TCC apply valve to intermittently stick in the valve body.
 
Internal damage in the torque converter may cause no TCC apply.
 
Fluid contamination

Plugged fluid circuits
 
Restricted fluid circuits
 

Refer to Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0756



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

Possible Causes:



If you clear DTC P0756, and then cannot reset DTC P0756, the following conditions may exist:

Fluid contamination
 
Plugged fluid circuits
 
Restricted fluid circuits
 

Refer to Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0756



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

Possible Causes:

If the DTC is cleared, then will not reset when the vehicle is driven, some of the following conditions may exist:



Fluid contamination
 
Plugged fluid circuits
 
Restricted fluid circuits
 
Inspect transmission fluid lines to radiator. Lines may be pinched, plugged or twisted.
 
Refer to Shift Solenoid Valve State and Gear Ratio .
 
Internal damage to the torque converter may prevent TCC application.
 

Trouble Code: P0757



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

Possible Causes:



If you clear DTC P0757, and then cannot reset DTC P0757, the following conditions may exist:

Fluid contamination
 
Plugged fluid circuits
 
Restricted fluid circuits
 

Refer to Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0757



2-3 Shift Solenoid (SS) Valve Performance - No Third, Fourth or Fifth Gear

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.
 
Contamination may cause the TCC apply valve to intermittently stick in the valve body.
 
Internal damage in the torque converter may cause no TCC apply.
 
Fluid contamination

Plugged fluid circuits
 
Restricted fluid circuits
 

Refer to Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0787



3-2 Shift Solenoid (SS) Control Circuit Low Voltage

Trouble Code: P0788



3-2 Shift Solenoid (SS) Control Circuit High Voltage

Trouble Code: P0851



Park/Neutral Position (PNP) Switch Circuit Low Voltage

Trouble Code: P0852



Park/Neutral Position (PNP) Switch Circuit High Voltage

Trouble Code: P0852



Park/Neutral Position (PNP) Switch Circuit High Voltage

Possible Causes:



It is possible for this DTC to set due to a stack-up or misalignment issue, where no electrical fault is present. Ensure the gear shift selector cable is properly adjusted and there are no service bulletins that address this concern before replacing parts.
 

Trouble Code: P0856



Traction Control Torque Request Circuit

Trouble Code: P0856



EBCM Torque Signal Circuit Invalid Request

Possible Causes:

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:



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

Trouble Code: P0856



Traction Control Torque Request Circuit

Possible Causes:



Check for poor or intermittent connections of the EBCM and the PCM. Refer to Testing for Intermittent Conditions and Poor Connections .
 

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: P0961



Line Pressure Control (PC) Solenoid System Performance

Possible Causes:



DTC P0961 may set under low voltage conditions caused by high electrical system demands.
 

Trouble Code: P0973



1-2 Shift Solenoid (SS) Control Circuit Low Voltage

Trouble Code: P0974



1-2 Shift Solenoid (SS) Control Circuit High Voltage

Trouble Code: P0976



2-3 Shift Solenoid (SS) Control Circuit Low Voltage

Trouble Code: P0977



2-3 Shift Solenoid (SS) Control Circuit High Voltage

Trouble Code: P1101



Intake Air Flow System Performance

Possible Causes:



Any condition that can cause the MAF, MAP, and TP sensors to be shifted in value at the same time will cause this DTC to set.
 
A malfunctioning displacement on demand (DoD) system may cause this DTC to set. Refer to Displacement on Demand (DoD) System Diagnosis .
 
This DTC may not set at an idle. It may need to be driven for this DTC to set.
 
Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:

Any aftermarket accessories--Refer to Checking Aftermarket Accessories .
 
The secondary ignition wires or coils
 
Any solenoids
 
Any relays
 
Any motors
 

A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 3-6 g/s at idle to 120 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not.A steady or intermittent high resistance of 15 ohms or more on the ignition 1 voltage circuit will cause the MAF sensor values to be skewed high by up to 60 g/s, and may cause this DTC to set. A high resistance will cause a driveability concern before this DTC sets.The BARO that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at key ON. When the engine is running, the ECM will continually update the BARO value near wide open throttle using the MAP sensor and a calculation. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate and may result in a no start condition. With the ignition ON and the engine OFF, the MAP Sensor parameter varies with the altitude. 101 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.A high resistance on the low reference circuit of the MAP sensor will skew the sensor value and may cause this DTC to set.A short to battery voltage on the 5-volt reference circuit of the MAP sensor will cause this DTC to set.If the condition is intermittent, refer to Inducing Intermittent Fault Conditions and Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1101



Intake Air Flow System Performance

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s. To pinpoint this condition perform a voltage drop test on the circuit.
 
Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 
A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 

Trouble Code: P1101



Intake Air Flow System Performance

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 
A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 

Trouble Code: P1133



HO2S Insufficient Switching Bank 1 Sensor 1

Trouble Code: P1134



HO2S Transition Time Ratio Bank 1 Sensor 1

 
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