04 gmc sierra 1500 5.3 died on me on the highway got it towed home starting going at it, hooked two different scanners to it and not throwing any codes (ecm is working bc the map was reading correctly but also the rpm was zero) anyways checked fire none checked injectors they wasnt working either(built fuel pressure then unplugged fuel relay then turned engine over and the pressure stayed the exact same) i assume it might be the crank sensor but i would think it would throw a code, anyways came back this morning and before doing anything for the hell of it i checked the gas cap and tightened it and it fired up perfect three different times and the last time i let it run and it died after bout 45 seconds (fuel pressure reads 55) and after it died its doing the same thing cranks but wont fire or start

Asked by Tatum4545 Feb 16, 2019 at 04:01 PM about the 2004 GMC Sierra 1500

Question type: Maintenance & Repair

died on me on the highway got it towed home starting going at it, hooked two
different scanners to it and not throwing any codes (ecm is working bc the
map was reading correctly but also the rpm was zero) anyways checked fire
none checked injectors they wasnt working either(built fuel pressure then
unplugged fuel relay then turned engine over and the pressure stayed the
exact same) i assume it might be the crank sensor but i would think it would
throw a code, anyways came back this morning and before doing anything
for the hell of it i checked the gas cap and tightened it and it fired up perfect
three different times and the last time i let it run and it died after bout 45
seconds (fuel pressure reads 55) and after it died its doing the same thing
cranks but wont fire or start

1 Answer

My 2005 gmc sierra with 5.3 would start and run fine and then die down the road a bit. Often it would restart after a few minute wait, I'm assuming the engine cooled a bit. It would sometimes throw a code for O2 just as it died but not always Changed the Crank Position Sensor and it has been good for another 100k. Both the crank and cam position sensors can fail without a code and will shut off fuel immediately, I'm assuming that's why the O2 codes would activate

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