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 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

194,675

I has been my experience that crank and cam sensors rarely throw a trouble code when they go open, you need a good lab scope to check the pulse and look for any electronic noise on the line. Check the crank sensor harness as these have known problems. You could just throw a new crank sensor on it and see what happens but use a GM part not an aftermarket. A gas cap will not keep your rig from firing up and running, but it may turn on the check engine light or gas cap warning depending on how it was programmed from the factory.

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