Envoy, Rainer, Trailblazer 2006-2007

4.2L L6 VIN S Auto 4

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Trouble Code: P0452



Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

Trouble Code: P0452



Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

Possible Causes:

P0451 and P0454



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.
 
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.
 

Trouble Code: P0453



Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

Trouble Code: P0453



Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

Possible Causes:

P0451 and P0454



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.
 
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.
 

Trouble Code: P0454



Fuel Tank Pressure (FTP) Sensor Intermittent

Possible Causes:



This diagnostic is designed to detect an unexpected abrupt voltage signal change from the FTP.
 
Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To look at the sensor signal under vacuum conditions, use snapshot and the purge/seal function to capture data while commanding purge to 30 percent, and then plot the data to look for erratic sensor operation. A similar inspection can be done for the pressure side of the sensor range by applying pressure with the J 41413-200 Evaporative Emission System Tester (EEST) while taking a snapshot.
 
Ensure that the reference port on the FTP sensor is unobstructed.
 

Trouble Code: P0454



Fuel Tank Pressure (FTP) Sensor Intermittent

Possible Causes:



This diagnostic is designed to detect an unexpected abrupt voltage signal change from the FTP.
 
Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To look at the sensor signal under vacuum conditions, use snapshot and the purge/seal function to capture data while commanding purge to 30 percent, and then plot the data to look for erratic sensor operation. A similar inspection can be done for the pressure side of the sensor range by applying pressure with the J 41413-200 while taking a snapshot.
 
Ensure that the reference port on the FTP sensor is unobstructed.
 

Trouble Code: P0454



Fuel Tank Pressure (FTP) Sensor Intermittent

Possible Causes:

P0451 and P0454



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.
 
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.
 

Trouble Code: P0455



Evaporative Emission (EVAP) System Large Leak

Possible Causes:



A loose, missing, incorrect, or damaged fuel fill cap may cause this DTC to set.
 
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 High Intensity White Light . Introducing smoke in 15-second intervals will allow less pressure into the EVAP system. When the system is less pressurized, the smoke will sometimes escape in a more condensed manner.
 
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .
 
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: P0455



Evaporative Emission (EVAP) System Large Leak

Possible Causes:



Inspect for a loose, missing, incorrect, or damaged fuel fill cap.
 
Verify that the fuel filler neck sealing surface is not distorted or damaged.
 
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 .
 
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.
 
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 the 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 leak test them one at a time using the adapters in the J 41413-300 .
 

Trouble Code: P0461



Fuel Level Sensor Performance

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same Freeze Frame conditions (RPM, engine load, vehicle speed, temperature, etc.). This will isolate when the DTC failed.
 
Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0461



Fuel Level Sensor Performance

Trouble Code: P0462



Fuel Level Sensor Circuit Low Voltage

Trouble Code: P0463



Fuel Level Sensor Circuit High Voltage

Trouble Code: P0464



Fuel Level Sensor 1 Circuit Intermittent

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, i.e. RPM, engine load, vehicle speed, temperature, etc. This will isolate when the DTC failed.
 
Refer to Testing for Intermittent Conditions and Poor Connections .
 
If the DTC sets without a refueling event, refer to Fuel Gage Inaccurate or Inoperative .
 

Trouble Code: P0464



Fuel Level Sensor Circuit Intermittent

Trouble Code: P0480



Cooling Fan 1 Control Circuit

Trouble Code: P0483



Cooling Fan System Performance

Trouble Code: P0493



Cooling Fan Overspeed

Trouble Code: P0495



Cooling Fan Speed High

Trouble Code: P0496



Evaporative Emissions (EVAP) System Flow During Non-Purge

Possible Causes:



An intermittent condition could be caused by an improperly installed or damaged EVAP canister purge valve or a temporary blockage in the EVAP canister purge solenoid valve.
 
For intermittent conditions, refer to Intermittent Conditions .
 

Trouble Code: P0496



Evaporative Emission System Flow During Non-Purge

Trouble Code: P0502



Vehicle Speed Sensor (VSS) Circuit Low Voltage

Trouble Code: P0503



Vehicle Speed Sensor (VSS) Circuit Intermittent

Possible Causes:



Inspect for ABS DTCs. A faulty ABS condition may contribute to setting DTC P0503.
 

Trouble Code: P0506



Idle Speed Low

Trouble Code: P0507



Idle Speed High

Trouble Code: P0520



Engine Oil Pressure (EOP) Sensor Circuit

Trouble Code: P0521



Engine Oil Pressure (EOP) Sensor Performance

Trouble Code: P0522



Engine Oil Pressure (EOP) Sensor Circuit Low Voltage

Possible Causes:



Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0522



Engine Oil Pressure (EOP) Sensor Circuit Low Voltage

Trouble Code: P0522



Engine Oil Pressure (EOP) Sensor Circuit Low Voltage.

Trouble Code: P0523



Engine Oil Pressure (EOP) Sensor Circuit High Voltage

Possible Causes:



Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help in determining how many miles since the DTC set. The Fail Counter and the Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0523



Engine Oil Pressure (EOP) Sensor Circuit High Voltage

Trouble Code: P0526



Cooling Fan Speed Sensor Circuit

Trouble Code: P0530



Air Conditioning Refrigerant Pressure Sensor Circuit

Possible Causes:



For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0530



Air Conditioning Refrigerant Pressure Sensor Circuit

Possible Causes:



A malfunction within the refrigerant system causing high pressure can cause this DTC to set.
 

Trouble Code: P0532



Air Conditioning A/C Refrigerant Pressure Sensor Circuit Low Voltage

Possible Causes:



A malfunction within the refrigerant system causing high pressure can cause this DTC to set.
 

Trouble Code: P0533



Air Conditioning A/C Refrigerant Pressure Sensor Circuit High Voltage

Possible Causes:



A malfunction within the refrigerant system causing high pressure can cause this DTC to set.
 

Trouble Code: P0562



System Voltage Low

Trouble Code: P0562



System Voltage Low - ECM

Possible Causes:



A low voltage DTC in multiple modules indicates a concern in the charging system.
 

Trouble Code: P0563



System Voltage High

Possible Causes:



A possible cause of this DTC could be overcharging with a battery charger or jump starting.
 
A high voltage value in multiple modules indicates a concern in the charging system.
 

 
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