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
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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