← Back to list

2004 Pontiac Grand Prix P0442 Code: Gas Cap Issue and Smog Check Requirements

Model: 2004 Pontiac Grand Prix Fault Code: P0442 Posted: 2007-08-21 13:33

A few weeks ago, my check engine light came on and I started seeing "gas cap removed" warnings on the dashboard. I would retighten the gas cap each time, which would temporarily resolve the warning, but the check engine light remained illuminated. Over the past month, the check engine light has stayed on without any new gas cap warnings. Recently, I failed a smog inspection due to a P044-2 diagnostic code. If the issue was caused by a faulty gas cap, should the check engine light turn off automatically, or is it necessary to clear the codes? Additionally, if I clear the P0442 code, do I need to drive a certain number of miles without the warning returning in order to pass smog inspection?

Related fault codes
P0442
Comments (3)
Anonymous 2007-08-21 14:39

Have you tried replacing the gas cap? A new one may resolve the P0442 code if it's related to a fuel system leak.

Anonymous 2007-08-22 17:39

I recently replaced the gas cap, but the check engine light remains on. Today, with the old cap still in place, the dashboard displayed "check gas cap" — even after replacement, the message persists.

Anonymous 2007-08-23 07:37

The P0442 code typically indicates a fuel vapor leak in the evaporative system. A professional smoke test is recommended to accurately identify and locate any leaks in the system.