So I've been testing this ODB device for work made by Delphi sold by Verizon Wireless. It tracks the vehicle and monitors malfunction codes and a few other things. I installed it this past Monday and one of the first pieces of data it asks you to enter is the current odometer reading.

At first I thought this was silly because I figured since this is a GPS based device and it "samples" your movement by taking location readings every so many seconds it would progressively become more and more behind as I drive the vehicle.

What is actually happening is exactly the opposite. Since I installed the unit I've drove about 100 miles according to the Delphi Connect and my odometer says I've driven about 90 miles. That's 10% and a huge discrepancy! I read on hear in the past where some have felt the odometer is a bit on the low side but I didn't think it was that bad!

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2006 Jeep Liberty Limited CRD (purchased 10/30/12 w/ 52k miles) GDE HotTune & Eco TCU, Suncoast TC, Amsoil Full SAPS (EFM) 5w40, Amsoil ATF, 7" touchscreen Android powered stereo (direct from China) w/ 4G LTE mobile data for streaming Netflix, HBO GO, Slingbox, Pandora, etc.

I recently had my speedometer re-calibrated at the dealer, and now it seems my odometer is way off. Seems to be off by roughly 9%. I wonder if this can be fixed?

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Mike Rausch
Bear, Delaware
2006 Liberty Sport CRD 253K

Funny you say that because my speedometer consistently reads about 5% higher than my actual speed. So I would say there's no way to fix it.

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2006 Jeep Liberty Limited CRD (purchased 10/30/12 w/ 52k miles) GDE HotTune & Eco TCU, Suncoast TC, Amsoil Full SAPS (EFM) 5w40, Amsoil ATF, 7" touchscreen Android powered stereo (direct from China) w/ 4G LTE mobile data for streaming Netflix, HBO GO, Slingbox, Pandora, etc.

You can have your speedometer re-calibrated, so I am guessing you can get the odometer re-calibrated as well. I am going to check into this eventually. My speedometer read 63-64mph at 60mph, now it is only maybe .5 mph off at most.

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Mike Rausch
Bear, Delaware
2006 Liberty Sport CRD 253K

The odometer and the speedometer have different settings for the revs/mile of the vehicle, one is set in the BCM the other the ACM. If you have access to a DRBIII you can program them to be accurate.

IIRC stock is about 710 revs/mile for the odo and 721 for the speedo......you do the math, but thats where the discrepancy comes from.

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http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

My Jeep is shod with brand new Cooper Discoverer CTS in 225/75-16's. My odometer is less than .1 miles off in a 5 mile odometer check section. The speedometer reads 1 mph different from my two GPS devices at 75 mph - higher by about 1. When I was using a borrowed DRB-3 to check out my rig, I noticed you can calibrate your odo and speedo by telling it how many revolutions per mile your tires go. most tire companies publish this data publicly. Sadly, Cooper does not on their website.

The tires are spec'd as 29.13 in diameter.

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05 CRD Sport in blue. Suncoast TC and ARP studs.

I have the Sealey timing kit I'll loan out.

My odo reads low by about 5-6% and my Speedo reads high 5%.

I am curious what the MPG calculator uses in the EVIC. I took a 7 hr trip and tracked it using GPS and came in about 5% lower MPG than the EVIC's said it was, therefore i am assuming it is somehow tied to the speedo since deriving from the speedo would suggest that you are going 5% farther than you actually are.

^^^ so 692.3 Rev/mile

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs

Sam: Can you explain this a bit more? Does it work on the 2006's? My buddy at the dealership did not think it could be done. I am awaiting a call back from him now. I did the math... my odometer is roughly 8% slow. 37.6 known miles reads 34.3.

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Mike Rausch
Bear, Delaware
2006 Liberty Sport CRD 253K

mass-hole,

I believe the main problem with the EVIC fuel economy calculation is due to accurately tracking how much fuel is burned. Even with a spot-on odometer I don't believe the displayed fuel economy would be all that accurate.

Also, I have noticed that the dashboard odometer and the EVIC odometer are actually measured differently. (And what's with the EVIC odometer trying to mimic a wheeled display including mimicking the rotational misalignment from one wheel to the next?) On a really long trip, I noticed that they eventually diverged but only by a very small amount. I think I will re-measure this on my next trip to St. Louis.

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2005 Liberty Limited CRD; Air Filter Monitor; Samco Hoses; GDE HOT Tune; RL037142AA TC; KJ Interior Rack from All J Products; JBA Adjust-a-strut lift and A-Arms; 245/75R16 Firestone Destination ATs on Moabs; ARB Bumper; ASFIR Skids; FS-2500 Bypass Filter; ARP studs.
2016 Grand Cherokee Overland CRD.