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2000 GMC Sierra 1500 Questions

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2000 Silverado 2wd. The truck was running perfectly fine, the taillights work until brakes are applied. I removed the whole wiring harness from under the truck, found the ground wire that’s wasn’t hooked up. Get everything back and ready to move truck only to find out it starts up but then shuts off....getting plenty of fuel pressure on the rail.... makes no sense-all fuses have been checked ( to my knowledge). Hope someone can help. Thanks
Having problem with my truck, started puttered out and now will not start. After turn the key on, the battery light flashes in the message center but then the security light comes on. It doesn't flash all the time and it doesn't stay on after my truck is off... is this a passlock issue? I tried the relearn 30 minute process, but the security message doesn't come off after 10 min. Again it only flashes on when my key is on the on position when I take the key out there's no message in the message center.
Hi there I got a Sierra gmc 2000 reverse lights not working checked all fuses and bulbs there not blown the wire tested the wires no power going to the reverse light wire what can it be?
Mechanic stated my fuel injectors needed to be replaced because it is a quote-unquote common problem for fuel injectors to break when the intake manifold is taken off to check for vacuum leaks.
when trying to drive truck seem's like rear brake's are holding, when rear end is jacked up rear wheel's spin easily with engine not running.????
Wiring issues?no taillights but brake and blinkers lights work.what do I do?
The hissing noise can be heard under my hood and inside the cab. I am the original owner and have keep it well maintained with only 88,000 miles has 5.3 motor and is 1500 SL series 4WD Again this only happen when I trun on my AC or heater .
headlight burned out in a 2000 GMC Sierra, how do I replace it?
The truck is running good but suddenly will not shift from 2nd to 3rd.
Replaced transmission and I get no power to the output shaft. No error codes. Pulled transfer case and I can see the output shaft move. With transfer case in I was able to get the output of the tc to roll until accelerator is used and then it stops until you let off and truck is idle. Fluid is good, filter replaced.
Transmission will not catch gears
4.3 - Ever since i replaced my heater core the truck has been hard to start - kills the battery - let it sit for 4 hours or more and if fires right up- drive up the street and back - park it - go back to leave again and it will not start - also, once i get it started i will just let it run in the driveway and after 5 to 10 min it just dies -i have changed plugs, wires, ignitor assembly - I did a fuel pressure test and it read about 56 psi
It is going back and forth between red and green... Still blowing warm air... Should I dump Freon and start from scratch??
Please help it's a challenge working out of this truck in one hundred degree heat..ANY info greatly appreciated
I lost my power brakes and power steering why would that happen
my daughter has a 2000 gmc sierra 1500 4.8 ltr 4x4 . at first start up engine has a knock sound for 2-3 min then is gone for the day. No check engine light visible doesnt burn oil tune up piugs/wires with in 3 mos. . sounds lower end noise not top end. what do i check and how. is it a knock sensor possibly?
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