20 Most Recent 2008 GMC Sierra 3500HD 2WD Questions & Answers

Have you done a continuity test with a volt meter?

how to change driver side headlight bulbs?

You are probably going to find four wires together that do not have a plug on them. There should also be a tag taped on the wires showing that it is for the trailer. You will have to put a plug or some kind of connection on those wires.

should be driven for 30 miles all highway miles to reset the exhaust filter. do you let your truck idle a lot. because the new trucks you can cut them on and off just like you would a gas truck. idle will make filter build up faster and running around town alot of stop and go . Don't be scared to blow it out that is really all you are doing is blowing it out. Your owner manual should have alot more details in it about cleaning your filter out. If i can help just re post.
Thanks dodge tec

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Could be a freeze plug or a head gasket. You might try using a small mirror.