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Just trying to think of something that would effect all those systems at once intermittently...possibly a bad ignition switch? Bad connection in the power distribution center?
code p 0500 and 503 both refer to the vehicle speed sensor(VSS)---circuit malfunction or intermittent/ errattic high input====causes wiring-=--VSS---ECM--wiring poor connection--other connected system---instrument panel---VSS---communication control module
to have the abs light on I would be checking the communication control module or the ECM
check for lights on, glove box trunk, under hood, these lights will run down the battery if they stay on, also if you have an aftermarket amp make sure its wired to key on power and not full time power
I had the same problem with my 1996 tahoe and it wound up that the fuel pump was going bad and then finally did go out completely. make sure you get an a/c delco or delphi fuel pump as they are much better than the cheaper aftermarket brands that fail after about 1 year or so. also, make sure they check the fuel pump relay located under your hood on the driver's side in the main fuse box. its about 10 bucks or so and also will cause your truck to die and not start again. it's well worth the investment to just replace it when doing the fuel pump. lastly, make sure they install a new wiring harned from the fuel pump in your gas tank to the electrical connector running to the engine. hopes this helps.
i would start with the basics. first have the battery checked to make sure its ok. then check the battery connections. one that people often miss is the very end of the cable, fold back the rubber and make sure the end is clean. check the fuse links on the cables. while your at it check the fuses. this is all assuming that the punched lock was repaired or the wires are taped off. this is only a beginning and must be checked before you can go any further.
For starters have the radiator and coolant system flushed which may help cool the engine better. But when it gets too hot, motor oil loses it's viscosity ( thickness and lubrication properties ) and gets thinner. Especially in hot weather you should make sure you have good oil and make sure you dont run it low on oil. On the flip side make sure that it's not overfilled because this will blow out the seals and you'll have much bigger problems than no power. Hope it helps!
Well in my madness of trying to figure it out with mama wanting it fixed and fixed fast and it being Hot! outside. I set back in the cool air with drink in hand wishing she had to do it instead of me, thought about it and said Ahhhhh! Coil pack or wires. I chose "coil pack" The problem is gone, Mama is happy and the world is right once again.
Coil pack would heat up and then breakdown.
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