The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
Platform: GMT 305, 360, & 370.
The dealer cannot find the problem with "Service Engine Soon."It has been there twice and of course, they charged us twice. It has now come on for a third time. I have swapped out the gas cap to no avail. Any thoughts?
I understand that the PO442 is a Service Engine Error code can be caused by one of the following:
1. Defective or loose fuel cap
2. EVAP canister or hose cracked- not connected
3. Purge or vent solenoid defective
4. Vaccum leak at engine
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