03 Check Engine Light Question

[Ed G.]

Had the same problem last week. Lost some performance and mpg went down.Then the light came on, so I called OnStar. They said it was a problem with the emission system.The dealer said it would a couple days before they could take a look at it. For the hell of it I disconnected the negative cable and let it sit for a few hours. The next time I drove it the light went off, performance and mpg went up. Haven't had any problems since.

[pdsq99f4]

The misfire is caused by excessive backpressure in the exhaust due to clogged catylitic converters. Usually you will find the air filter is very dirty and causing the vehicle to run rich. This will take out the converters over time. Touchdown, I would check my air filter to be on the safe side.

[BUMMER]

Just wanted to revive this thread. My 03 H2 has 73000 miles, is this true that GM will cover all bad catalytic converters up to 80,000?. Or does this only apply to certain states. My H2 is registered in New York

[Easy Ed]

Just looked and took a pic of the warrenty info in the glove box in my 2003 and you are correct on the 80,000. Pic not to great but you should be able to see it good enough to see the one in question.

Ed
Attachment 52564

Originally Posted by BUMMER

Just wanted to revive this thread. My 03 H2 has 73000 miles, is this true that GM will cover all bad catalytic converters up to 80,000?. Or does this only apply to certain states. My H2 is registered in New York

[BUMMER]

Thank you Easy, thats exactly what I wanted to see. I called up my local dealer and it is in fact covered. Thank goodness bc I was going to pay my mechanic to have it replaced for $$$