Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** common things to cause this code is fuel cap, vent solenoid, or purge solenoid. But a leak anywhere in system can cause the code. At this point I think you are better off paying a shop to do the smoke test otherwise that would be next step after purge solenoid. Let me know if you have more questions, thanks.
I would replace the purge solenoid but if problem still happens after that you will need to have smoke test done. Let me know if you have more questions, thanks.
The fuel tank pressure sensor is what computer uses to find leaks so if they are sure there are no leaks that means the fuel tank pressure sensor has failed. Let me know if you have more questions, thanks.
Here is a picture with replacement instructions.