help please

Old 11-11-2013, 06:25 PM
Thread Starter
Join Date: Nov 2013
Posts: 1
Default help please

I have a 2000 k2500 7.4 l w @ 72000 miles. It started that very occasionally when stopping to get gas or a coffee, I would come out and have a no start. A quick test would show pressure but unsure of how much as didn't have gage with me. After 5 secs to 10 minutes it will restart, usually just seconds though. I started carrying a scanner and 1 time the scanner said unable to obtain data not unable to communicate, leading to believe pcm issue. Removed pcm and disassembled and found one melted circuit inside, so replaced pcm. prior to this as purely educated guess, replaced crank sensor, coil and module with no improvement. It never last long enough to do a proper diagnoisis.
Now when driving it will feel like ignition turned off and then will come back as pulling off road. prior to pcm replacement it did die at highway speed. Today it started to die and be unresponsive 3 times while driving but never stalled and continued to drive ok after a couple seconds. My gut is saying ignition switch but an looking for others input in a issue similar.
Old 11-16-2013, 11:35 PM
NullHead's Avatar
TruckForum Addict
Join Date: Apr 2011
Location: Detroit, MI
Posts: 1,227

It's hard to say unless you can get a proper diagnosis of the problem while it's happening ... I've seen some strange things happen from a bad fuse block. Perhaps a grounding issue with the PCM? As far as I'm concerned, putting a new ignition switch on it wouldn't hurt all that much. At least you'll know your ignition switch isn't the problem lol :P
Related Topics
Thread Starter
Last Post
Chevy Silverado/ GMC Sierra Forum
09-06-2011 08:13 PM
Chevy Silverado/ GMC Sierra Forum
09-27-2009 11:03 PM
Toyota Tundra
05-19-2006 03:38 PM
Chevy Silverado/ GMC Sierra Forum
09-25-2005 05:58 AM
General Motors Tech
08-20-2005 12:04 AM

Thread Tools
Search this Thread
Quick Reply: help please

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.