A GPS is as accurate at calculating your vehicle speed as is a 'certified'
speedo in a police car. So when the speedometer in my 2006 Liberty was
registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
next service interval. The mechanic came up with a relatively easy fix. He
re-programmed the computer to make it think I had different sized tires on the
car. He got it dead on. However, the odometer still registers less kilometers
than the GPS records. I have verified the GPS odometer with the markers along
the highway.

Can anyone confirm that electronically altering the speedometer reading would
not necessarily change the odometer as well?

Thanks

 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com

 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com

 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com

 

On Tue, 28 Aug 2007 10:18:15 -0400, budman@frozenorth.ca wrote:

>
>A GPS is as accurate at calculating your vehicle speed as is a 'certified'
>speedo in a police car. So when the speedometer in my 2006 Liberty was
>registering 107 kph when the GPS was showing 120 kph, I mentioned this at my
>next service interval. The mechanic came up with a relatively easy fix. He
>re-programmed the computer to make it think I had different sized tires on the
>car. He got it dead on. However, the odometer still registers less kilometers
>than the GPS records. I have verified the GPS odometer with the markers along
>the highway.
>
>Can anyone confirm that electronically altering the speedometer reading would
>not necessarily change the odometer as well?
>
>Thanks


Strange, it should correct it too unless speedo gage itself is out of
cal (amount a signal to it need to show desire deflection) and if this
is the case correcting speedo reading via ECM would fix speed and
through odometer off. I suggest you take it back to dealer and have
them restore programing and pull speedo gage and have it checked for
calibration. I had this problem once on a GM truck and speedo itself
was bad.
-----------------
TheSnoMan.com