engine immoblizer
 

Today went for a haircut and got into my H3, put the key in and the truck would turn over but would not start. After contacting Onstar, I was told it was security issue. I finally got it to start by pressing lock and unlock on my remote. I was wondering if maybe someone tried to break in to it and the engine immobilzed. This has never happened before. Has this happened to anyone and why?

Re: engine immoblizer
 

What year is it? Older models have a habit of the passlock going out. Do a search on the Hummer forums for "passlock." It is a piece in the key/iginition switch that wears out.

Re: engine immoblizer
 

Mine did this last thursday when I got in my truck to leave work. Truck turned over but wouldnt fire like it wasnt getting fuel. I switched the headlight relay with the fuel pump relay and it started right up. I think the relay was going bad but it had also cut out on me a few weeks before but cranked right back up. Maybe a different problem, but you might want to check your relays as well