This is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems.
And where you can purchase replacement parts on Amazon if you want to do the repair yourself.
Trailblazer Speedometer
Dr Speedometer Repair Kit Includes 6 Qty Six Brand...
Amazon com Dr Speedometer Repair Kit...
SOURCE: replace low beam headlight on 2003 chevy trailblazer
when the hood is open there are two pins that have to be pulled. they have a 90 degree bent end that have to be rotated and pulled directly up. once both are pulled the headlight can be slid out and headlight changed.
SOURCE: I have a 2002 chevy trailblazer LS. The gauges on
check to make sure a fuse hasnt blown or a relay
SOURCE: i have a 2003 chevy trailblazer and the low beams stopped working
Check the relay in the relay/fuse box under the hood. There should be a diagram either on top of the cover or under the cover to tell which relay it is just like your internal fuse box.
SOURCE: The battery light comes on in my 2008 Trailblazer
sounds like the alternator is dead and the battery is discharged now
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