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Discussion Starter · #1 ·
Last night when returning to my truck I noticed that the time and date had reset back to factory default. As I drove home at night, I flashed my high beams and immediately felt a stumble to the truck, the airbag lights went on, and the parking assist deactivated notice came on. A half second later, everything went back to normal. I tried it again later and flashing the high beams had no effect. This morning everything was fine, but when I parked the truck again, it lost complete power immediately upon shutting off the truck, and the radio needed resetting again. When it does this I heard a faint buzz under the left side dash, perhaps at the fuse box.

I can't find a RAP listed on Rock Auto, Advanced Auto, or GM Parts Direct, and no direct reference to one here. Does it have one? Any other ideas?
 

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I dont know about the RAP module, but there use to be a lot of problems with the earler models battery cables coming loose or getting corrosion on the insides of them and causing a loss of power , The mega fuse by your battery was also getting corroded up cause loss of power, throws traction control and abs lights, windows wont role up or down, ect. but truck would still run. Something to check out anyways.
 

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I had the same issue with my truck when I first bought it used. It ended up being the battery terminal clamps being bad. The OEM ones corrode and lose connection. I also sanded the frame grounds below the driver's door to be sure. Haven't had an issue since then.
 

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2001 GMC Sierra 2500HD CCSB
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Probably a bad ground as noted above. Mine was doing some strange stuff like that and I added a new ground cable from the battery to engine block. That fixed the crazy light flashing on dash problems and also the warning dinger had some static to it. Then the truck started to crank slowly so I suspect battery was going bad as well. Replaced battery and its been totally fine since. This was within the past month as well, just as it started getting cold.

Winter is the time of year to kill a battery off completely if they are weak.

If you want to check for RAP or any electrical, give this site a look http://www.revbase.com/BBBMotor/Wd
 

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I agree with all the suggestions above. Grounds and battery cables are the likely culprits.
 

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Discussion Starter · #6 ·
We did have a cold front two weeks ago...it got down to 62 degrees. :lol:

Ok, first check cables...second check ground. Is the frame connection point easy to spot when I'm under the truck? I'll be working for the next few days and won't get to the GMC until Sunday.
 
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