service engine light came on, did a diagnostic test with a can obd2 car reader and it came up with a po 453 code. can anyone tell me what this means?

Asked by Apr 12, 2015 at 01:02 PM about the 2003 Pontiac Grand Am GT Coupe

Question type: Maintenance & Repair

1 Answer

75,345

This is an EVAP system trouble code. The computer has detected a high input signal from the gas tank pressure sensor. There are a few components to check beginning with the gas cap. It may be faulty. The wiring going to the pressure sensor may be faulty. The charcoal canister may be bad. The vent valve itself may be bad. Or the gas tank could be damaged. The EVAP system sends gasoline fumes back to the engine to be burned instead of releasing them into the air.The system became required in California beginning 1970 and nationwide beginning 1971. HTH. -Jim

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