Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner
1 - 1 of 1 Posts

2003 chevy trailblazer_lt
17 Posts
Discussion Starter · #1 ·
Good Afternoon. My service engine light lit up today. 2003 w/ 66K miles. Last time it lit up, I put the gas cap back on right and it went away. This time the cap did not seem to be loose. Re-seated it and we will see.

Went to Autozone for a reading and got the single P0442

I'll give it a day or 2 to see if it goes out. Wish I could clear it.

If the error code remains, where do I start?
- How do you check a gas cap to see if it is OK?
- How do I test the solenoid?
- Since this is a vacumn based system, can I draw a vacum on it to isolate the leakk?

I have the Haynes manual so I can find all the parts aand check for the obvious hose or connection issue.

1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.