After inspecting the system and tightening the gas cap I reset the alarm via OBDII scanner. After a few days without any variable changes the alarm returns. My thought is that if there is an actual fault, then the alarm would return as soon as the vehicle is placed back into service. Why the multiple day delay? Codes P0440 & P0440Pd Chevy Tahoe 2000
Chevrolet Q&AAsk Your Question
2000 Chevrolet Tahoe Question: Why does the code not return, until after a few days, after being reset?
Answer #1G. T. Service Center (4231 Answers) , Stephenville, TX - (254) 638-3236ProfessorG May 05, 2014, 10:58Master
Once you clear it then when it runs the EVAP test it sees the fault again to alert you of the fault. Fix the problem and maybe it will stay off.
Answer #2pushrod May 05, 2014, 17:20Master
Use your scanner to run an EVAP test...then check live data to view componets....may need to run a movie while driving.. then check freeze frame data..
ReplyProfessorG, May 05, 2014, 17:33Master
Chitty Chitty Bang Bang? Hummm