Odometer off by 5%

Bill.Barg · **Posted:** Thu Jul 19, 2007 2:04 am

Speedometer recalibrated for 245/75 16 by original owner. Accurate to GPS within 2% (scangaugeII reading)
Odometer seems independent of speed calibration with -8.5% error compared to GPS and ScangaugeII

Cowcatcher · **Posted:** Thu Jul 19, 2007 9:49 am

Bill.Barg wrote:

Speedometer recalibrated for 245/75 16 by original owner. Accurate to GPS within 2% (scangaugeII reading)
Odometer seems independent of speed calibration with -8.5% error compared to GPS and ScangaugeII

Yup they are different and by the way welcome!

robert46123 · **Posted:** Fri Jul 20, 2007 9:25 am

Well, I'm glad it's not just ours. Our spedometer is definately off by about 5%. Driving 55 shows 52 on my GPS. I haven't checked the odometer, but I'm sure it would follow suite.

Kniggit · **Posted:** Sun Jul 22, 2007 11:33 am

add me to the list of people always getting passed when the spedo is reading 5 over, checked it with GPS and the Little HiPo trailers, and they show me of by 5%.

K

Endurance · **Posted:** Sun Jul 22, 2007 12:10 pm

ATXKJ wrote:

I went to 245/75/16's and my Speedo virtually dead on (we have the neighborhood radar speed signs)
odometer's off ~5%

Those radar speed signs are so off that its not even funny. I would go by GPS, compare speed and distance.

spencevans · **Posted:** Tue Jul 24, 2007 12:35 am

I have been aware that my odometer has been off since the day I bought it. I run the 245/75/16's so this results in a 9-11% difference depending on how new my tires are. The funny thing is the speedo is dead on. Go figure.

dirtmover · **Posted:** Fri May 02, 2008 8:35 am

My odometer reads 5% low and the speedometer is 9% high. A curious combination and since the two are linked only by time would suggest that they are deliberately calibrated this way. One would suspect that the odometer is calirated low to prevent any possibility of law suits where they wish to deny warranty a few wiles over the limit.

fastRob · **Posted:** Fri May 02, 2008 3:28 pm

dirtmover wrote:

My odometer reads 5% low and the speedometer is 9% high. A curious combination and since the two are linked only by time would suggest that they are deliberately calibrated this way. One would suspect that the odometer is calirated low to prevent any possibility of law suits where they wish to deny warranty a few wiles over the limit.

How did you calibrate?
How do you know how far off the odometer and speedo are?

Bill.Barg · **Posted:** Fri May 02, 2008 4:08 pm

I believe that for 06 models, the odometer signal is from the ABS computer while the speedo gets its signal from the body computer. The speedo is calibratable by the dealership (tire size variations). I have not heard of anyone getting the odometer calibrated correctly. My odometer is -9% off with 30.5" diameter tires.

dirtmover · **Posted:** Mon May 05, 2008 8:11 am

fastRob wrote:

dirtmover wrote:

My odometer reads 5% low and the speedometer is 9% high. A curious combination and since the two are linked only by time would suggest that they are deliberately calibrated this way. One would suspect that the odometer is calirated low to prevent any possibility of law suits where they wish to deny warranty a few wiles over the limit.

How did you calibrate?
How do you know how far off the odometer and speedo are?

The odometer was verified against the highway markers and a GPS. The speedometer was verified against a GPS.

warp2diesel · **Posted:** Mon May 05, 2008 10:05 pm

On my CRD any way, changing to taller tires with a 10% greater rolling radius would correct my odometer error, but the speedo error would then become worse.

Does any one know which resistor could be replaced by a pot so the speedo can be calibrated :?:

Taller tires and a speedo calibration pot may be a way to partly undo the Efen 37, any thoughts?

Or would that mess up the bus and set off a CEL?

Odometer off by 5%

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