Having problems with your 2000 GMC Sierra ?
Fuel gauge isn't working right
Some of those GM trucks have a problem with the stepper motor on the instrument cluster sticking. Its pretty simple to change them- a bit touchy tho. order them on amazon for about 3 bucks or take it to a mechanic and he'll put a new cluster in for 150-350 bucks. I just replaced the coolant gauge motor on my 04 Yukon. eureka its fixed.
Repair Help & Product Troubleshooting for 2000 GMC Sierra
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