P0452 Buick -

Question

I keep getting a 452 code on my 2005 Buick park ave non supercharged V-6 I have replaced the fuel tank sensor the vapor cannister purge valve the vapor canister vent solenoid I've checked the vaccumm hoses and all the electrical connections too what am I missing?

Answer 1

Hi Tom

You need to go and have a smoke test done on the car. If that proves there are no leaks in the evap system, then you need to put a scan tool on it that can read the pressure sensor voltage. Let the car run for a while, or park it in the sun and go back in an hour and check the pressure voltage. If it hasn't changed, then the issue is likely the wiring from the pressure sensor to the computer.