I have a 2000 Cadillac Deville DTS with the 4.6L High Output Northstar. i have had The engine light on since i bought it november 2013. it always reads only one code the EVAP P0443. i have changed the evap purge solinoids and the vapor canister but the code never goes away. i have been driving the car everyday since i bought it and it drives perfectly no problems it has failed ontario etest everytime i put her threw. its my daily driver only passed when a mechanic did the etest with the exhaust probe. my fuel gauge always reads full as the fuel level/pressure sensor is gone on the car. now i have been told that the fuel level/pressure sensor could be what is causing the system to show the code. ????
Well, I don't think so. The pressure sensor will throw its own code (0450, 0451, 0452, 0453, or 0454). And likewise, the fuel level sender or sensor could also throw its own codes (P0460-P0464).
I'm not sure the level sensor and the pressure sensor are linked together. They are separate on a 2005 buick century, the pressure sensor being at the top of the tank located on the fuel pump module, but Cadillac: anything is possible.
Since you replaced the purge solenoid, there may be a problem in the circuit. The purge should have battery voltage to it with the key on. The ECM will ground the circuit internally when the purge is wanted. One symptom of a purge valve that isn't working or stuck closed can be a whooshing sound when the fuel tank cap is opened, indicating excessive pressure in the tank.
A shop's scan tool could be used to command the purge valve on to check it.
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