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Discussion Starter · #1 · (Edited)
Just Noticed My Speedometer Stops at 1 to 2 MPH

Hello all,

I have noticed a 1 to 2 MPH discrepancy between the GPS on my new navigation system and my speedometer on my GXP since I had the new unit installed in February. I thought it was the head unit that was off until I took a real close look at the speedometer when I was sitting dead stopped at a stop light a couple nights ago. The speedometer did not drop to 0 MPH as it should have at the stop light but instead dropped to between 1 to 2 MPH. After I got home and turned off the car the speedometer did not return all the way to 0 but stopped at the 1 to 2 MPH as earlier. I never noticed this behavior with the speedometer before.

Is this something I should be concerned with?

Could the stereo techs have accidentally done something when he had the dash off (paranoia on my part)? :dunno:

Is it expensive for a dealer to fix?

Is a very difficult project for an automotive novice like myself to fix?

I may be able to live with subtracting 1 to 2 MPH from what's registering on the speedometer as long as it doesn't get worse.

Thoughts?
 

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The pointers can be rotated on the spindles. When installing a new gauge cluster background you have to remove and replace them. See black cat custom web site for instructions.

But I done see the tech removing the gauge cluster or tampering with it for a stereo install?
 

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I'm amazed that you noticed a 1-2 MPH difference. My speedometer and GPS have differed by different amounts and in different directions depending on what tires are mounted.

In all probability the speedometer has always done that and you have just not noticed it until now.
 

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As rob says, you can just pop the tunnels and front gauge cover, then readjust the needle on the drive axle.

For EXACTLY how to do a correct alignment, I did this write-up to help folks replacing all their needles after doing an aftermarket gauge-face replacement:

There's a real trick to getting the needles back on and aligned at zero (not as easy as you might think). This is my step-by-step guide. Follow it exactly and you'll be fine. (Whatever you do, don't replace the window/dash etc, until you've driven the car and made sure your needles are aligned correctly!)

1. Start with the clear front screen still off, the wiring connector plugged back into the back of the cluster (if you previously removed it) and ignition off.
2. VERY lightly place at least one needle(s) on shaft(s) at roughly the 0/zero position. DO NOT PRESS DOWN (you will need to adjust placement later). This will allow you to see what's happening in the next step.
3. Turn on ignition and then off again, wait ~20 secs for the needles to settle to their 'negative' position (normally, below the 0's).
4. Turn on ignition and fake start the car by turning key to the start position with foot off the clutch (if you have an autobox, I guess you can start the car and turn it off again). Needles will do the test sweep and return to exact zeros.
5. Turn off ignition. During the 15secs or so while all needle shafts are at their zero positions, gently remove and replace needles to point exactly at each zero and push the needles down on shafts - but no more than halfway. NOTE: be careful, it's easy to knock/turn the stepper motor shafts round while doing this and you'll have to repeat. If you run out of time just do one or two of the needles at once.
6. Repeat steps from #3 above, to verify that needles are set correctly. If not remove/repeat. If they are correct, then push down all the way. Then test again! Go for a short drive then park and lock the car and go away for 10 minutes. Come back and check again!
7. If all's OK, clip clear screen back on and put everything back together.

Note: Doesn't matter how much gas you have, gas gauge will read 0 at step 5.
 

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Discussion Starter · #5 ·
Thanks all.

I guess as suggested it may have been like this for a while and I hadn't noticed. I can live with it. Not too anal when it comes to the speed I'm going. Just looks "not right" after I noticed the needle. Too lazy to tear into dash just for this.

If I ever need to fool with taking the dash apart for something relevent I'll refer back here and adjust accordingly.
 
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