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Discussion Starter · #2 ·
the reason your speedometer on your 2004 Chevy Impala is reading 120 when you are really going 45 is because the tires are smaller than what is programed into the cars data. you have two choices. one get it programed to the smaller size or two buy bigger wheels.

10 Posts
Sounds like a common instrument problem that I also have.

Try this.

When your speedo or other instruments are not working.
1) Stop and shut car off
2) With the vehicle off, put it into R (reverse)
3) Attempt to start car a few times (the car wont start in reverse)

This should resync your gauges.
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