Envoy, Rainer, Trailblazer 2006-2007

4.2L L6 VIN S Auto 3

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Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is under a load or when the engine is cold.
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the following possible sources:

A tire or wheel that is out of round or out of balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 

 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is under a load or when the engine is cold.
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the following possible sources:

A tire or wheel that is out of round or out of balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 

 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is under a load or when the engine is cold.
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect for the following possible sources:

A tire or wheel that is out of round or out of balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 

 

Trouble Code: P0315



Crankshaft Position (CKP) System Variation Not Learned

Trouble Code: P0324



Knock Sensor (KS) 1 Module Performance

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0325



Knock Sensor (KS) Circuit

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant. The KS mounting surface should be free of burrs, casting flash, and foreign material.
 
The KS must be clear of hoses, brackets, and engine electrical wiring.
 

Trouble Code: P0325



Knock Sensor (KS) 1 Circuit

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0326



Knock Sensor (KS) Performance

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant. The KS mounting surface should be free of burrs, casting flash, and foreign material.
 
The KS must be clear of hoses, brackets, and engine electrical wiring.
 

Trouble Code: P0326



Knock Sensor (KS) 1 Performance

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0327



Knock Sensor (KS) 1 Circuit Low Frequency

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS and the KS fastener should be free of thread sealant. The KS mounting surface must be free of burrs, casting flash, and foreign material.
 
The KS should be clear of hoses, brackets, and engine electrical wiring.
 
For an intermittent condition, refer to Intermittent Conditions .
 

Trouble Code: P0327



Knock Sensor (KS) 1 Circuit Low Voltage

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0328



Knock Sensor (KS) 1 Circuit High Voltage

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0330



Knock Sensor (KS) 2 Circuit

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0332



Knock Sensor (KS) 2 Circuit Low Frequency

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS and the KS fastener should be free of thread sealant. The KS mounting surface must be free of burrs, casting flash, and foreign material.
 
The KS should be clear of hoses, brackets, and engine electrical wiring.
 
For an intermittent condition, refer to Intermittent Conditions .
 

Trouble Code: P0332



Knock Sensor (KS) 2 Circuit Low Voltage

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0333



Knock Sensor (KS) 2 Circuit High Voltage

Possible Causes:



Inspect the KS for physical damage. A KS that is dropped or damaged may cause a DTC to set.
 
Inspect the KS for proper installation. A KS that is loose or over torqued may cause a DTC to set. The KS should be free of thread sealant.
 
The KS mounting surface should be free of burrs, casting flash, and foreign material.
 

Trouble Code: P0335



Crankshaft Position (CKP) Sensor Circuit

Trouble Code: P0336



Crankshaft Position (CKP) Sensor Performance

Trouble Code: P0351



Ignition Coil 1 Control Circuit

Trouble Code: P0352



Ignition Coil 2 Control Circuit

Trouble Code: P0353



Ignition Coil 3 Control Circuit

Trouble Code: P0354



Ignition Coil 4 Control Circuit

Trouble Code: P0355



Ignition Coil 5 Control Circuit

Trouble Code: P0356



Ignition Coil 6 Control Circuit

Trouble Code: P0365



Exhaust Camshaft Position (CMP) Sensor Circuit

Possible Causes:



The following conditions may cause this DTC to set:

Damage to the camshaft reluctor wheel
 
Damage to the CMP sensor
 
The sensor coming in contact with the reluctor wheel
 
Foreign material passing between the sensor and the reluctor wheel
 

If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0365



Exhaust Camshaft Position (CMP) Sensor Circuit

Trouble Code: P0366



Exhaust Camshaft Position (CMP) Sensor Performance

Trouble Code: P0411



Secondary Air Injection (AIR) System Incorrect Air Flow Detected

Trouble Code: P0412



Secondary Air Injection (AIR) Solenoid Control Circuit

Trouble Code: P0418



Secondary Air Injection (AIR) Pump Control Circuit

Trouble Code: P0420



Catalyst System Low Efficiency Bank 1

Trouble Code: P0442



Evaporative Emissions (EVAP) System Small Leak Detected

Possible Causes:



To help locate intermittent leaks, use the J 41413-200 Evaporative Emission System Tester (EEST) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the J 41413-SPT High Intensity White Light.
 
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .
 
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for vacuum decay, this type of leak may be detected.
 

Trouble Code: P0442



Evaporative Emissions (EVAP) System Small Leak Detected

Possible Causes:



To help locate intermittent leaks, use the J 41413-200 Evaporative Emission System Tester (EEST) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with theJ 41413-SPT High Intensity White Light.
 
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .
 
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for vacuum decay, this type of leak may be detected.
 

Trouble Code: P0442



Evaporative Emissions (EVAP) System Small Leak Detected

Possible Causes:



The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. For example, when injecting smoke at the service port, remove the filler cap or temporarily leave the vent open until smoke is observed. Close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV at the service port to allow the system to fill faster.
 
To help locate intermittent leaks, use the J 41413-200 to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the J 41413-SPT .
 
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .
 
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for vacuum decay, this type of leak may be detected.
 
If a small leak is difficult to find, it may be necessary to remove the EVAP components and test them one at a time using the adapters in the J 41413-300 .
 

Trouble Code: P0443



Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Trouble Code: P0446



Evaporative Emissions (EVAP) Vent System Performance

Possible Causes:



An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem.
 
An EVAP canister, vent hose, or vent solenoid valve that has restricted flow may cause this DTC to set. Using a purge solenoid command with a scan tool will allow vacuum to be applied to the system instead of pressure. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 10 inches H2O.
 
Disconnecting one component at a time while the EVAP system is under flow will help to pinpoint a restriction in the system.
 
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
 
For intermittent conditions, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0446



Evaporative Emission (EVAP) Vent System Performance

Possible Causes:



An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill problem.
 
An EVAP canister that is restricted can cause this DTC to set.
 

Trouble Code: P0449



Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:



A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set. By using the purge solenoid command on a scan tool, vacuum can be applied to the system instead of pressure. With the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the vacuum should not increase to more than 9 inches H2O.
 
Ensure that the reference port on the FTP sensor is unobstructed.
 
An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan Tool Output Controls, Snapshot, and Plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.
 
A full fuel tank may cause misdiagnosis.
 
When using the electronic emission system tester (EEST) to apply pressure, you can regulate the amount of pressure by activating the remote switch ON and OFF while observing pressure in the EVAP system using a scan tool.
 

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:



A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set. By using the purge solenoid command on a scan tool, vacuum can be applied to the system instead of pressure. With the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the vacuum should not increase to more than 9 inches H2O.
 
Ensure that the reference port on the FTP sensor is unobstructed.
 
An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan Tool Output Controls, Snapshot, and Plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 Evaporative Emission System Tester (EEST) while taking a snapshot.
 
A full fuel tank may cause misdiagnosis.
 
When using the electronic EEST to apply pressure, you can regulate the amount of pressure by activating the remote switch ON and OFF while observing pressure in the EVAP system using a scan tool.
 

 
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