Dealership can now reprogram / calibrate speedometer and odometer for bigger tires

DayJ

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On my 2019 JL I had the dealer do my recal for tires, well I'm back again for my newer 2020 and they said they need to actually buy something different and that the old flash way isnt the way any more. I feel like this is a puff of steam... Any word out there from 2020 guys?





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Fred

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On my 2019 JL I had the dealer do my recal for tires, well I'm back again for my newer 2020 and they said they need to actually buy something different and that the old flash way isnt the way any more. I feel like this is a puff of steam... Any word out there from 2020 guys?
Did you show them this? I had to show it to my dealer 2 years ago on my 2018 JLR
 

DayJ

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Did you show them this? I had to show it to my dealer 2 years ago on my 2018 JLR
I did via text, not in person... They were able to do my 2019 (RIP) but now they are saying they have to order a part for the 2020... Just checking other experiences with 2020 folks.
 

BlackGenesis

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Get OBD Jscan App, 12+8 Chrysler bypass wires and OBD2 bluetooth adapter (total cost of $75 for all to your door)

Save your self time and money ... and sanity

Also will be able to program your tire pressure (set mine to give out warning at 20spi) and anything else that Tazer does.
 

DayJ

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Savin warranty is what I'm trying to do. The dealer just sent me a picture of a rough country calibrator that they are having people use....
 

rk86

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Savin warranty is what I'm trying to do. The dealer just sent me a picture of a rough country calibrator that they are having people use....
did you ever get it done? im asking my dealership now if they can just swap in bigger tires for me when i take possession of the vehicle and calibrate them there...waiting on response.
 

DayJ

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did you ever get it done? im asking my dealership now if they can just swap in bigger tires for me when i take possession of the vehicle and calibrate them there...waiting on response.
Yupp they sure did.
 

millerjl

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I just did this when I picked up my 2021, 2 weeks ago. Had them put on new wheels and tires before pickup and they said now they actually put in your VIN and tire size, send it to FCA and then they get a file back to upload and reprogram the Jeep.
 

rk86

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I just did this when I picked up my 2021, 2 weeks ago. Had them put on new wheels and tires before pickup and they said now they actually put in your VIN and tire size, send it to FCA and then they get a file back to upload and reprogram the Jeep.
That's cool. Did it also take the new PSI of larger tire into consideration?

Also - what did they do with your stock wheels/tires? I just wanted them to remount my factory rims on some 35's which they said they'll do, but they won't buy back or give me any kind of credit on the stock 33's so I don't really know what to do with them as I would prefer not to load my garage up with 5 tires I'm not planning on using.
 

millerjl

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My dealer in SoCal gave me $1200 credit for my wheels and tires :handsinair:

not sure if it changes anything in the TPMS
 

ratherbskiing

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My dealer charged me $135 for the recalibration service. I asked them what tire size they typed in and they said 35'' since I'm on 35's. I told them that they need to measure the actual tire size and then I received a lecture about how wrong I am and how they have never done it that way in the past. I mentioned I'm looking at the Mopar sheet that says "do not assume sidewall value is correct". I was then accused of being overly "critical". I'm going to try and see if they can fix it. So my advice is to just be super clear about what you want upfront.
 

Rhinebeck01

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My dealer charged me $135 for the recalibration service. I asked them what tire size they typed in and they said 35'' since I'm on 35's. I told them that they need to measure the actual tire size and then I received a lecture about how wrong I am and how they have never done it that way in the past. I mentioned I'm looking at the Mopar sheet that says "do not assume sidewall value is correct". I was then accused of being overly "critical". I'm going to try and see if they can fix it. So my advice is to just be super clear about what you want upfront.
@ratherbskiing

My advice would be do not have the stealership do the re calibration.. You can do it yourself for well under $100.00.
 

Off-Road Toad

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Yea...my speedo is off 5 to 7 mph with 35" tires so last Friday, I checked with 2 different dealerships in the local area...one wanted $265 and told me that there was a "part" that I needed to purchase and that they would have to order it before having it done...and the other dealership wanted $225 for the re-flash but didn't mention anything at all about a part having to be ordered to complete the job. :swear: In fact, they told me that they would just have to be on the phone with FCA during the process...what about, I don't know...and said it would take about an hour to accomplish. Sounds like a bunch of horse-hockey to me and I don't know what to believe at this point. But, if this does affect shifting points with the vehicle, I think that it's pretty important that it gets done fairly quickly. Anyone have any other experiences like mine??? :facepalm:

Does anyone know if the mopar calibration ACTUALLY adjusts the shifting points >???
I'm putting on 37s and shifting point re-calibration is the only reason I would want this service...
Thanks !!!
 

W5MQS

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Does anyone know if the mopar calibration ACTUALLY adjusts the shifting points >???
I'm putting on 37s and shifting point re-calibration is the only reason I would want this service...
Thanks !!!
I can tell you that for about a week I ran my Jeep with 35" tires and I sensed that the shift points were slightly off compared to running them with the 33s that it came with. Once I re-cal'd my speedo to reflect the 35" tires, everything seemed fine...and has been ever since. Could the shift points have actually been off just a tad to make it noticeable to me? Sure. Or was it just me thinking they were off? Could've been that too. Logic dictates to me that a larger size tire affects your RPMs and that would affect the shift points. But again, that's just me. At any rate, my Jeep has run and shifted just fine ever since I had it recalibrated. That was nearly 3 years ago now.
 

jludave

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Does anyone know if the mopar calibration ACTUALLY adjusts the shifting points >???
The tire size adjustment/calibration doesn't actually do anything to the transmission. The JL transmission will automatically adjust and relearn the shift points once the vehicle is adjusted for the proper tire size.
 

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