2005 GMC will crank but not start any ideas
 

I have a 2005 GMC 1500hd will crank over but will not run.Any idea where or what I should check.Thanks

Re: 2005 GMC will crank but not start any ideas
 

Air, fuel, spark...any details on the truck like miles, maintenance, engine codes, etc would help. If it was running fine one day and not the next, I'd check the fuel pump. Usually you can hear them running to prime the system for a few seconds when you first turn the key on.

Re: 2005 GMC will crank but not start any ideas
 

Thanks I live in Nova Scotia Canada I got water in my gas and it we had some really cold nites working good now .thanks for the reply

Re: 2005 GMC will crank but not start any ideas
 

I had a similar issue with my 03 2500 HD a few years back. I started it and back out of the garage to load some stuff in the bed and shut it off. Went to restart and it did nothing, no cranking or anything. My buddy who is a GM tech came over and did some testing. Turned out my ECM went bad and I had to have it towed to a GM dealer for replacement and reprogramming. Hopefully this is not your problem.

Re: 2005 GMC will crank but not start any ideas
 

I found out what was wrong I put plugs and wires in it now it runs fine again. Should have did that first before checking everything else. thanks for your help

Re: 2005 GMC will crank but not start any ideas
 

One thing to check is the oil pressure switch to fuel relay circuit.....they are designed not to run without proper oil pressure thus the oil pressure switch is a 3 wire setup.....a test light and a multimeter will help you figure it out.......search youtube for a "crank but no start issue" for gm truck.................