Question about 1999 GMC Suburban
Friday my truck started fine(some rain). Saturday it sat(lots of heavy wind and rain, in an open parking lot). By Sunday morning it turned over, just wouldn't start. Connected a Gen-Tech diagnostic computer(hand held) to the truck and it gave me a 'high voltage across the ignition control module' error. I replaced the ICM and I still have the same error. I hear my fuel pump engaging and everything else sounds good. My oil pressure is low due to a botched job my buddy did on my oil pan. Would that cause that high voltage error though? My fuel gauge has been flippy floppy but I hear it engaging, could it be a ground wire? That happened before but nothing happened when I turned the key that time, the ground wire fell against the tank. Or could it just be water under the engine near the fire wall on electrical components, since I did see water near my ICM? So many angles to come from and I'm trying to dry things out but Ohio has imperfect weather this time of year, rain one day and below freezing the next. Any help or suggestions would be awesome. As a single mom I try to do what I can myself, plus I know it'll get done right but I'm lost right now and need a wee bit of advice and/or direction. The truck has 228,000miles on it. still a youngin! LOL
Sounds like the fuel pump sorry. you can look for fuel pressure at the rails, but the issue with the fuel gauge is common right before the pump goes. check for spark, then fuel. need both to start it.
Posted on Dec 25, 2013
Testimonial: "Thank you. I'm going to borrow a fuel pressure gauge and see if that tells me anything. Seems like I'm changing these fuel pumps every couple of years. I had the pressure checked in Aug because I thought something wasn't 100% then but I was told everything was ok. I'm thinking that was the start of what is going to end up being my problem. Gotta love all of the plastic that goes into these parts anymore. Thank you again Keith."
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Posted on Jan 02, 2017
You may have a problem with the contacts in the ignition switch (not key part), when you crank the engine a signal is sent to the fuel pump to run, when it starts and you let off the key another set of contacts keeps the pump getting power Through a relay), these are known as crank and run modes.
Posted on Aug 04, 2008
Okay so I have the same issue with my 1999 Gmc Safari!! Out of frustration one day I sat in the car and was ready to blow it up when I noticed that the "SECURITY" light was on every time this happened!!! I would wait for the light to go off and the car would start. I spoke to my mechanic friend and he said that if it was a security sensor problem it will reset itself after 10 minutes, and the car will start!! YOU must leave the key in the ignition and in the on position in order for it to reset. Next time you have the issue TRY THIS!! It may be your long awaited solution. This has been going on for about 5 years now for me....
Posted on Jun 18, 2010
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