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P0446 code continues to come on

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i have replaced the valve/solenoid under the fuel tank, and the gas cap. What else could it be?

Vehicle: 2003 Chevy Avalanche 5.3 V8

1 Answer

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The most popular code that set P0446 is the fuel tank presssure (FTP) sensor.If it gives the wrong information as for fuel tank pressure P0446 is usually the result. The location of the FTP is at the top of the fuel pump module.

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