2003 H2 Loss of power while driving

[RUaH2Lover]

Hi,

Looking for some help. I have a 2003 H2 that I have not had any problems with until I upgraded my OnStar to digital last month. Ever since then the check engine light will come on for a second the engine will buck and the door locks open then close. This only happens intermittenly so it has been hard to explain to the dealer. The dealer claims this coundn't have any thing to do with the OnStar upgrade but can not find any problem. Has anyone had a similar problem?

Thanks,

Joe

[lennyrebel]

Hi,

Looking for some help. I have a 2003 H2 that I have not had any problems with until I upgraded my OnStar to digital last month. Ever since then the check engine light will come on for a second the engine will buck and the door locks open then close. This only happens intermittenly so it has been hard to explain to the dealer. The dealer claims this coundn't have any thing to do with the OnStar upgrade but can not find any problem. Has anyone had a similar problem?

Thanks,

Joe
Sounds like a gremlin--better get a gremlin checker--my experience is bugs usually deteriorate until they leave you stranded. What's OBD 2 tester say? Might be worthwhile to invest in one if you haven't got one.

[BKLYNH2]

Just went through something similar. It was the catylitic converter and was still under warranty.