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International Automotive Technicians Network
Re: 08 3500 silverado- keeps running w/key off
Posted to Technical Discussion Forum on 1/4/2022

I've seen defective high mount stop lights cause this problem as well as shorted tail light bulbs (brake shorted internally to tail light).

I start with a visual on the brake/tail lights to make sure they are the same brightness and to see if there are any o... Login to read more.