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My 2004 recently failed my PA emissions test due to the check engine light not working properly. Sometimes it comes on then off, as it should. Other times it doesn't come on at all. I checked the bulb and it seems to be working. I talked to a Chevy tech and said he's never heard of this...

My 2004 Tahoe recently failed emission inspection due to an intermittent check engine light. Sometimes the check engine icon comes on briefly then goes off, which I'm thinking this is what is supposed to happen. Other times it doesn't come on at all. I removed the instrument cluster but...

Hi, guys. Hopefully I can get the info I need to fix my problem. Glad to be a member.