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Your Auto Inspector
Your Auto Inspector, Assistant Service Manager
Category: Car
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Experience:  Tires Plus
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1999 gmc suburban 4x4 it gets trouble codes po452,po453.and

Customer Question

1999 gmc suburban 4x4 it gets trouble codes po452,po453.and po305. know what they are and where they at but can not find any imformation on how to check po452,&453. the po305 had been settings sense i bought it three years ago .i have replaced injector,plugs,wires and distributor.maybe easy and cheap i know i'm dreaming.you may know just what to do any help would be appreciated.thank you for your help. larry
Submitted: 6 years ago.
Category: Car
Expert:  Your Auto Inspector replied 6 years ago.

Code P0452 Fuel Tank Pressure Sensor Circuit Low Voltage

 

Sounds like a faulty fuel tank pressure sensor. It is located on the fuel pump housing.

 

graphic

FUEL TANK PRESSURE SENSOR REMOVAL

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

  1. Disconnect the negative battery cable.
  2. Relieve the fuel pressure.
  3. Lower the fuel tank.
  4. Drain the fuel tank.
  5. Remove the fuel tank.
  6. Disconnect the Fuel lank Vapor Pressure Sensor electrical connector.
  7. Remove the Fuel Tank Vapor Pressure sensor from the fuel tank housing.

FUEL TANK PRESSURE SENSOR INSTALLATION

  1. Install the Fuel Tank Vapor Pressure Sensor on the fuel tank.
  2. Reconnect the Fuel Tank Vapor Pressure Sensor electrical connector.
  3. Install the fuel tank.
  4. Connect the negative battery cable.

Here is the diagnostic procedure for the fuel tank pressure sensor.

 

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graphic

Code P0453 Fuel Tank Pressure Sensor Circuit High Voltage

 

graphic

graphic

Both of these codes should be solved by replacing the Fuel Tank Pressure Sensor.

Your Auto Inspector, Assistant Service Manager
Category: Car
Satisfied Customers: 874
Experience: Tires Plus
Your Auto Inspector and 16 other Car Specialists are ready to help you
Customer: replied 6 years ago.
About a year ago I replaced the fuel pump and I had to put a different plug on the end of the wire the instructions said that it was a better type of plug maybe that is the problem? Thank You, XXXXX XXXXX
Expert:  Your Auto Inspector replied 6 years ago.

If there is a system pressure leak, then you would have a different code. I believe that the sensor itself has failed.

 

Please let me know if there is anything else I can do to assist you.

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