Diagnostic Aids
WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
An accurate indication of fuel level is required for PCM to properly pass or fail this DTC. Always diagnose fuel level sensor DTCs first.
Ensure battery voltage is 10.5-18.0 volts, fuel level is 15-85 percent of full capacity, and engine temperature is 38-95°F (3.5-35°C). Check for loose, missing, defective or incorrect fuel tank cap, incorrectly routed or defective EVAP system vacuum and vapor lines, malfunctioning or damaged vapor canister.