2003 Civic Speedometer Issue - Honda Civic Forum

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2003 Civic Speedometer Issue

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Old 08-11-2018
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2003 Civic Speedometer Issue

I have a 2003 Civic LX. My speedometer began reading about 15-20% higher than it should about two months ago. I verified the incorrect reading by comparing my speed to two other vehicles and a speed app on my phone. The other vehicles and the app all had the same reading while mine was higher. For example, my speedometer showed 70 mph while the others were at 60. My odometer is registering more mileage by a similar percentage (verified by known mileage).

The local Honda dealer checked my vehicle and said that the speedometer is reading correctly. The service write-up says "Checked speed with HDS and speed is correct". When I provided backup that it is not correct, all they offered to do was call Honda and see what they suggested - I am still waiting to hear back from them. Aside form the speedometer/odometer issue, the only other symptom I am having is that the cruise control started acting up around the same time - it maintains a speed, but I can feel it surging (as if repeatedly applying the gas and letting off). Does anyone have a suggestion or advise on getting the speedometer checked and fixed?

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Old 08-11-2018
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Re: 2003 Civic Speedometer Issue

So they connected a scanner that showed the same speed that your speedometer is displaying.
Speedometer is doing exactly what the PCM is telling it to do. (possible GIGO?)


Seems that nobody (dealer techs) compared that scannerinfo against GPS? That's a problem.

about two months ago.
Was any work done to the car two months ago?


What size tires are on the front of the car?
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Old 08-11-2018
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Re: 2003 Civic Speedometer Issue

The only work done around the time I first noticed the issue was a transmission drain and fill and I had to have the left front cv axle boot band replaced. The front tires are the same size as the original tires (185/70 R14).
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Old 08-12-2018
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Re: 2003 Civic Speedometer Issue

If the tire size is correct for the car,

I'd be tempted to try replacing the VSS and see what happens.

Or drive around with a phone app/navigation unit showing road speed and ignore the speedometer
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Re: 2003 Civic Speedometer Issue

I have actually been using a speed app on my phone at times. The speedometer being off does not bother me as much as the odometer registering more mileage than it should.

I was shocked when the dealer told me that my speedometer was correct and that there was basically nothing else they could do. I may try replacing the VSS as you suggest.
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Old 08-12-2018
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Re: 2003 Civic Speedometer Issue

Possible VSS was removed to fill the transmission, so that drain and fill might actually resulted in issue.

Never know what a greasy monkey might do...
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Old 08-12-2018
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Re: 2003 Civic Speedometer Issue

Originally Posted by Slumpertcivic View Post
Possible VSS was removed to fill the transmission, so that drain and fill might actually resulted in issue.
I would not think it possible to be that......


Um, Does OP have a manual trans, or automatic?
Maybe you should get a scanner of your own so you can verify the speedometer really is displaying exactly what the engine computer is seeing, via live data list
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Old 09-03-2018
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Re: 2003 Civic Speedometer Issue

Sorry, I had missed your reply. I have an automatic transmission. I did check the speed using a scanner and its reading matched my speedometer.
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Re: 2003 Civic Speedometer Issue

Originally Posted by Civic 03 View Post
Sorry, I had missed your reply. I have an automatic transmission. I did check the speed using a scanner and its reading matched my speedometer.
I have actually been using a speed app on my phone at times. The speedometer being off does not bother me
Guess you could spend money on a speed sensor and see if that changes anyting.....or use the GPS for free instead
as much as the odometer registering more mileage than it should.
The car is old enough that mileage probably matters very little on resale value.
My state doesn't care about accurate mileage after 100,000 when transferring a title.
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