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2002 gmc sierra 2500hd

won't start intermittently

2002 gmc sierra 2500hd

Postby csb55 [OP] » Apr 29 2013, 10:04pm

it randomly won't start after i shut it off. no check engine lite, no codes on code reader took it to the dealer ran diagnostics came up with nothing took it to another shop came up with nothing put a crankshaft postion sensor in it because 8.1s have had problems with cps still does it anybody?
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Re: 2002 gmc sierra 2500hd

Postby mfdrookie516 » Apr 29 2013, 11:12pm

Will it crank? If not, definitely look at your terminals. I've seen several vehicles that intermittently crank, and the cables and/or ground wire have been corroded or loose.
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Re: 2002 gmc sierra 2500hd

Postby csb55 [OP] » Apr 30 2013, 5:01am

it cranks over till the battery goes dead
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Re: 2002 gmc sierra 2500hd

Postby snashbar » Oct 02 2013, 6:14am

I have essentially the same truck with the same problem. (02 GMC 2500 with 8.1) Mine does it rarely and will typically start right up if I turn the key all the way off and try again. If I leave the ignition on and keep trying it will turn over and over but never start. Seems to be more common when it is cold and damp. I live in the foothills east of Stockton CA and the summers here are warm and dry and I rarely have the problem in the summer. When I take my trailer over to the coast (Cooler and damp) it will do it almost every morning. Once the truck is warm, it will start right back up after a shut down. When I get back to a warmer and dryer climate it is also fine. Drives me nuts, and my local GMC shop is stumped... No check engine light and my code reader never comes up with anything. So far it has never left me anywhere, so I am dealing with it. Would love to hear if somebody has figured this out...
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Re: 2002 gmc sierra 2500hd

Postby TK-Leather » Oct 17 2013, 4:15pm

New to the site but not the 8.1. I have a 2002 Silverado HD, Mine used to do this as well when it had about 100k on the clock, not a single code was ever thrown. Ended up throwing a crank sensor in it and the problem went away. I was amazed that a bad crank sensor never once produced a code but thats what fixed it. I have another100k since then with virtually no problems.
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Re: 2002 gmc sierra 2500hd

Postby rockhound » Feb 26 2014, 6:07pm

yep crank shaft position sensor

Hot start issues, loss of power while driving also,

2001-2006 8.1 liter, CPS was recalled on 2007-2008

mine had the same issue for about a month before it finally threw a code.
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