How do you recalibrate/adjust the speedometer?

[spartacus777]

From the manufacture. https://www.zautomotive.com

ha.. thank you much

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[Backwoodsraider]

Will be using the obd jscan app. Along with theobd module you need an additional cable. Total cost like 60. Module, cable, vin purchase

 

[Reeb65]

I used the rough county calibrator. Was easy to use for $149. I did order to Procal snap and found the install near impossible. It is not as easy as just plugging in the white snap to the port.

 

[ColoradoGlad]

Will be using the obd jscan app. Along with theobd module you need an additional cable. Total cost like 60. Module, cable, vin purchase

Is the App now working with the JL/JT?

 

[Gvsukids]

My speedometer is 2 mph slower than GPS at whatever tire size I use. I've gone up and down a hole inch, do I need to go more?

 

[ColoradoGlad]

My speedometer is 2 mph slower than GPS at whatever tire size I use. I've gone up and down a hole inch, do I need to go more?

I used the Jscan and it took a few tries to get it right.. I can't recall what it ended up at, but it was matched to the GPS and when I come across the road speed limit warning signs, it's always been dead on. I do know I used a size that was NOT the exact size of the tire.

 

[DocMike]

I have used the tazer twice now for recalibrating tires. Went from stock to 33 and now 35.
Between this and adjusting the TPS alert pressure....the lite was worth it.
Measure the tire correctly. They are never what they claim to be.

@ 5:19

 

[jjdustr340]

I used the Jscan and it took a few tries to get it right.. I can't recall what it ended up at, but it was matched to the GPS and when I come across the road speed limit warning signs, it's always been dead on. I do know I used a size that was NOT the exact size of the tire.

Same here. Speedo matches gps, the radar stations near the school show same as speedo.
I measured the tire right between 33.25 and 33.5 inches and ended up with 33.75 in Jscan to get it accurate.

 

[TrainMan]

Using Jscan I had to enter 35" even though it measured 33.75.

 

[MainePure]

I had an appointment to have my local dealer do it, but they said Chrysler was making them sign me up for a 2 month service plan for $125 before they could do the work. Smelled funny so I passed. Any truth to this?

 

[Trippin01]

I did the ECRI programmer, and it too lets you adjust about everything. ends up being about $135 with the $50 in app purchase for each vin#

https://www.amazon.com/gp/product/B082T48ZVC/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

 

[PancakeCritter]

My speedometer is 2 mph slower than GPS at whatever tire size I use. I've gone up and down a hole inch, do I need to go more?

Are you using your phone for a GPS app? While connected to USB in the truck? For whatever reason, this will cause it to display the vehicle speed from the Jeep itself, instead of calculating from GPS.

 

[jay21mojave]

I had an appointment to have my local dealer do it, but they said Chrysler was making them sign me up for a 2 month service plan for $125 before they could do the work. Smelled funny so I passed. Any truth to this?

My dealer for the past 2 years explained that FCA makes them pay $100 for re-programming .. I USE Jscan App on the Iphone bought 3 vins and a $20 donegal for the OBD connection.

http://jscan.net/jeep-wrangler-jt/

 

[ColoradoGlad]

I had an appointment to have my local dealer do it, but they said Chrysler was making them sign me up for a 2 month service plan for $125 before they could do the work. Smelled funny so I passed. Any truth to this?

Suggest you look into the Jscan app... It pretty much will do anything you want and it's priced right... I use the iPhone App, and picked up the security cables and OBS Adapter off Amazon....
Nothing stays connected to the Jeep. Set and disconnect.

 

[MainePure]

Thanks guys, I'll check it out.

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