Envoy, Rainer, Trailblazer 2006-2007

5.3L V8 VIN M Auto 4

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Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Improper engine oil pressure, or worn engine valve components can cause an engine misfire on vehicles equipped with the displacement on demand (DoD) system. Refer to Displacement on Demand (DoD) System Diagnosis .
 
Excessive vibration from sources other than the engine could cause DTC P0300 to set. The following are possible sources of vibration:

Thickness variation of the brake rotors--Refer to Symptoms - Hydraulic Brakes .
 
Excessive driveline vibration--Refer to Vibration Analysis - Driveline .
 
Worn or damaged accessory drive belt--Refer to Drive Belt Vibration Diagnosis .
 

There may be more or less cylinders actually misfiring than indicated by the scan tool.Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring.If there are multiple misfires on only one bank, inspect the fuel injector and ignition coil, power and ground circuits for that bank. Refer to Engine Controls Schematics .
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set, without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Improper engine oil pressure, or worn engine valve components can cause an engine misfire on vehicles equipped with the displacement on demand (DoD) system. Refer to Displacement on Demand (DoD) System Diagnosis .
 
Excessive vibration from sources other than the engine could cause DTC P0300 to set. The following are possible sources of vibration:

Thickness variation of the brake rotors--Refer to Symptoms - Hydraulic Brakes .
 
Excessive driveline vibration--Refer to Vibration Analysis - Driveline .
 
Worn or damaged accessory drive belt--Refer to Drive Belt Vibration Diagnosis .
 

There may be more or less cylinders actually misfiring than indicated by the scan tool.Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring.If there are multiple misfires on only one bank, inspect the fuel injector and ignition coil, power and ground circuits for that bank. Refer to Engine Controls Schematics .
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set, without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Improper engine oil pressure, or worn engine valve components can cause an engine misfire on vehicles equipped with the displacement on demand (DoD) system. Refer to Displacement on Demand (DoD) System Diagnosis .
 
Excessive vibration from sources other than the engine could cause DTC P0300 to set. The following are possible sources of vibration:

Thickness variation of the brake rotors--Refer to Symptoms - Hydraulic Brakes .
 
Excessive driveline vibration--Refer to Vibration Analysis - Driveline .
 
Worn or damaged accessory drive belt--Refer to Drive Belt Vibration Diagnosis .
 

There may be more or less cylinders actually misfiring than indicated by the scan tool.Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring.If there are multiple misfires on only one bank, inspect the fuel injector and ignition coil, power and ground circuits for that bank. Refer to Engine Controls Schematics .
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set, without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0307



Cylinder 7 Misfire Detected

Possible Causes:



Improper engine oil pressure, or worn engine valve components can cause an engine misfire on vehicles equipped with the displacement on demand (DoD) system. Refer to Displacement on Demand (DoD) System Diagnosis .
 
Excessive vibration from sources other than the engine could cause DTC P0300 to set. The following are possible sources of vibration:

Thickness variation of the brake rotors--Refer to Symptoms - Hydraulic Brakes .
 
Excessive driveline vibration--Refer to Vibration Analysis - Driveline .
 
Worn or damaged accessory drive belt--Refer to Drive Belt Vibration Diagnosis .
 

There may be more or less cylinders actually misfiring than indicated by the scan tool.Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring.If there are multiple misfires on only one bank, inspect the fuel injector and ignition coil, power and ground circuits for that bank. Refer to Engine Controls Schematics .
 

Trouble Code: P0307



Cylinder 7 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set, without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0307



Cylinder 7 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0308



Cylinder 8 Misfire Detected

Possible Causes:



Improper engine oil pressure, or worn engine valve components can cause an engine misfire on vehicles equipped with the displacement on demand (DoD) system. Refer to Displacement on Demand (DoD) System Diagnosis .
 
Excessive vibration from sources other than the engine could cause DTC P0300 to set. The following are possible sources of vibration:

Thickness variation of the brake rotors--Refer to Symptoms - Hydraulic Brakes .
 
Excessive driveline vibration--Refer to Vibration Analysis - Driveline .
 
Worn or damaged accessory drive belt--Refer to Drive Belt Vibration Diagnosis .
 

There may be more or less cylinders actually misfiring than indicated by the scan tool.Spray water on the secondary ignition components using a spray bottle. Look and listen for arcing or misfiring.If there are multiple misfires on only one bank, inspect the fuel injector and ignition coil, power and ground circuits for that bank. Refer to Engine Controls Schematics .
 

Trouble Code: P0308



Cylinder 8 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set, without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0308



Cylinder 8 Misfire Detected

Possible Causes:



A misfire may only occur when the engine is operating under a load or when the engine is cold.
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire P0300-P0308 DTC to set without setting an IC circuit P0351-P0358 DTC.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A misfire DTC could be caused by an excessive vibration from sources other than the engine. Inspect the following for possible sources of vibration:

A tire or wheel that is out of round or balance
 
Variable thickness brake rotors
 
An unbalanced drive shaft
 
Certain rough road conditions
 
A damaged accessory drive component or belt
 
A damaged reluctor wheel
 
The Crankshaft Position System Variation Learn procedure may need to be performed.
 

 

Trouble Code: P0315



Crankshaft Position (CKP) System Variation Not Learned

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 

Trouble Code: P0324



Knock Sensor (KS) 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 mounting surface should be free of burs, casting flash, and foreign material.
 

Trouble Code: P0325



Knock Sensor (KS) Circuit

Trouble Code: P0325



Knock Sensor (KS) Circuit Bank 1

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 mounting surface should be free of burs, casting flash, and foreign material.
 

Trouble Code: P0326



Knock Sensor (KS) Performance

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 mounting surface should be free of burs, 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 Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0327



Knock Sensor (KS) Circuit Low Voltage Bank 1

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 mounting surface should be free of burs, casting flash, and foreign material.
 

Trouble Code: P0328



Knock Sensor (KS) Circuit High Voltage Bank 1

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 mounting surface should be free of burs, casting flash, and foreign material.
 

Trouble Code: P0330



Knock Sensor (KS) Circuit Bank 2

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 mounting surface should be free of burs, 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 Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0332



Knock Sensor (KS) Circuit Low Voltage Bank 2

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 mounting surface should be free of burs, casting flash, and foreign material.
 

Trouble Code: P0333



Knock Sensor (KS) Circuit High Voltage Bank 2

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 mounting surface should be free of burs, casting flash, and foreign material.
 

Trouble Code: P0335



Crankshaft Position (CKP) Sensor Circuit

Possible Causes:



DTC P0335 and P0340 will set with the ignition switch in the Start position if the starter monitor is inoperative, or the starter motor control circuit is inoperative. When the ECM enables starter motor operation, the ECM also initiates the diagnostic test routines for DTCs P0335 and P0340. If a condition exists which prevents the engine from cranking, the ECM will not receive a signal input from the CKP and the camshaft position (CMP) sensors.
 

Trouble Code: P0335



Crankshaft Position (CKP) Sensor Circuit

Possible Causes:



With a DTC set, the engine may crank for an extended period of time during start-up.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 

Trouble Code: P0335



Crankshaft Position (CKP) Sensor Circuit

Possible Causes:



With this DTC set, the engine may crank for an extended period of time during start-up.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 

Trouble Code: P0336



Crankshaft Position (CKP) Sensor Circuit

Trouble Code: P0336



Crankshaft Position (CKP) Sensor Performance

Possible Causes:



With a DTC set, the engine may crank for an extended period of time during start-up.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 

Trouble Code: P0340



Camshaft Position (CMP) Sensor Circuit

Possible Causes:



DTCs P0335 and P0340 will set with the ignition switch in the Start position if the starter motor is inoperative, or the starter motor control circuit is inoperative. When the ECM enables starter motor operation, the ECM also initiates the diagnostic test routines for DTCs P0335 and P0340. If a condition exists which prevents the engine from cranking, the ECM will not receive a signal input from the crankshaft position (CKP) and the CMP sensors.
 

Trouble Code: P0340



Camshaft Position (CMP) Sensor Circuit

Possible Causes:



With a DTC set, the engine may crank for an extended period of time during start-up.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 

Trouble Code: P0341



Camshaft Position (CMP) Sensor Performance

Trouble Code: P0341



Camshaft Position (CMP) Sensor Performance

Possible Causes:



With a DTC set, the engine may crank for an extended period of time during start-up.
 
This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 

Trouble Code: P0351



Ignition Coil 1 Control Circuit

Trouble Code: P0351



Ignition Coil 1 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

 
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