URGENT dealer wants to charge me $145 for "recalibration to new tire size"

[ShadowsPapa]

They are completely, 100% full of ahit. It's that simple. There is no "caibration" to the steering or brakes for thwninstallation of bigger tires. Your toe will be off, as that is still set for the factory tires. The larger 315s will be toed in more than the stock tires, simply because the leading edge of the tire is further away from the axle centre line. So, an alignment is needed, but no electronic "calibration", other than what you've already done regarding tire size.

Toe is measured in degrees. That won't change.
One reason they do that is to account for different diameter tires.
If you go the old fractions of an inch method, yes, that would differ.
But these go by degrees, mine, for example, should be: - 1/32 degree to +1 1/64 degrees
Bigger tires will have more forces trying to shove them toe-out so you definitely want to be sure toe is correct, bit it won't change.

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[OHJeeper]

The whole "steering" and "brakes" stuff is total BS, as others have said. But... dealers do have a service offering, usually about $100, where they will not only do the reprogramming for you if you don't have JScan/etc but will also update your vehicle configuration in the FCA/Stellantis database. What this means is that if they ever have to flash/reset the PCM the new settings also get sent. Otherwise, you have to do the JScan update again.

This is a rare instance, but for some a peace of mind sort of situation.

 

[Maximus Gladius]

I asked a couple dealerships to recalibrate for my slight upsized tires and they said we don’t do that. These dealerships are in Calgary.

 

[ScooterInTX]

That is all that is needed! However, it's really simple to put the transmission back in relearn mode, too, with jscan.



Can't hurt to go through the process outlined by jscan and have the transmission relearn - based on new tires if the size is a lot different.




That's a hoot. Steering has zip to do with tire size, that's all about angles.
Brakes? ABS goes by the sensors at each wheel.

@ShadowsPapa So IS there a bit more that we can/should do in JSCAN when we upsize or does the tire change procedure in JSCAN take care of other things like shift points?

 

[Hootbro]

My dealership wanted to $350 to do it. Said they have to purchase the software from Jeep and download it etc....If they told me $145 I would have done it haha.

In the very early JL days after release, the dealer techs using their OEM WiTech scan tool could just change the tire size calibration. Jeep then implemented a program called "Mopar Custom Calibration" that required the dealerships to purchase basically what was a quasi vehicle protection plan for them to be able to download the software to update a particular customers vehicle. The software was VIN specific to do the upgrade and also put the sales code into the Jeep system that if there was any future PCM software upgrades applicable to vehicle, it would catch the tire size change and not zero it out.

The dealership actually has to purchase that software custom calibration and take the additional time to process it. That increase cost in addition to the actual labor time to do the update is passed on the customer.

When Jeep went to the Mopar Custom Calibration scheme, that also blanked out the ability of the dealer tech to do it manually once their WiTech tool was eventually updated later.

 

[ShadowsPapa]

@ShadowsPapa So IS there a bit more that we can/should do in JSCAN when we upsize or does the tire change procedure in JSCAN take care of other things like shift points?

I didn't change tire size by very much either time and it was fine just doing the tire size change.
That should take care of it. I used GPS to compare miles traveled to odometer reading and went from there - speedometer wasn't accurate enough for me. In my final check, I drove 17 miles after setting my trip meter to 0 and resetting the trip tracking on my GPS device to 0. They matched to the tenth of a mile when done.

I double-checked JSCAN docs and the automatic relearn stuff JSCAN talks about seems to be for prior transmissions in other model Jeeps.

JSCAN says that with the MANUAL transmission one should follow their procedure to reset things.

So bottom line - reset tire size and drive it. Life should be good.

 

[Lunentucker]

If you don't need or want all of the extras that a Tazer will do for you, ECRI is a nice and less costly option for speedometer calibration and a few other features, like gearing, lighting options.

Really simple and easy to use with their mobile app.

 

[redriderjf87]

Well done handling it. This is the reason I avoid dealers at all costs.

I would've ended up playing their game and asking for specifics on how they're recalibrating my steering and brakes, until it became obvious they have no specifics. Your way was more efficient though.

 

[Orange01z28]

I bought 315/70r17's and mounted/balanced them myself. I bought the bypass cable and Jscan and recalibrated the Jeep to my new tire size. I dropped my Jeep off this morning to have the wheels road force balanced and they just called to tell me it was all set. They want to charge me $145 to "recalibrate the jeep to the new tire size so the brakes and steering operate correctly". I informed them that I already took care of the tire size change on my own and they told me that yes the speedo would be correct but i might have issues with my steering and brakes.

At the end of the day, I am either paying the 60 bucks they want for the balancing (bargain if you ask me), or 230 dollars which includes the recalibration/tax/fees.

What are they talking about?

Go to Discount Tire or something for your balancing

That's dealer theft trying to get you to do that

 

[Klicht87]

In the very early JL days after release, the dealer techs using their OEM WiTech scan tool could just change the tire size calibration. Jeep then implemented a program called "Mopar Custom Calibration" that required the dealerships to purchase basically what was a quasi vehicle protection plan for them to be able to download the software to update a particular customers vehicle. The software was VIN specific to do the upgrade and also put the sales code into the Jeep system that if there was any future PCM software upgrades applicable to vehicle, it would catch the tire size change and not zero it out.

The dealership actually has to purchase that software custom calibration and take the additional time to process it. That increase cost in addition to the actual labor time to do the update is passed on the customer.

When Jeep went to the Mopar Custom Calibration scheme, that also blanked out the ability of the dealer tech to do it manually once their WiTech tool was eventually updated later.

My dealership makes you purchase the AEV PRO SNAP calibration tool.

 

[ShadowsPapa]

My dealership makes you purchase the AEV PRO SNAP calibration tool.

Makes you?

 

[Klicht87]

Makes you?

Let me rephrase that. If you want the dealer to recalibrate for different size tires, the only option they offer is to sell you the prosnap and they do it. You do keep the prosnap.

 

[Geoarch]

I bought 315/70r17's and mounted/balanced them myself. I bought the bypass cable and Jscan and recalibrated the Jeep to my new tire size. I dropped my Jeep off this morning to have the wheels road force balanced and they just called to tell me it was all set. They want to charge me $145 to "recalibrate the jeep to the new tire size so the brakes and steering operate correctly". I informed them that I already took care of the tire size change on my own and they told me that yes the speedo would be correct but i might have issues with my steering and brakes.

At the end of the day, I am either paying the 60 bucks they want for the balancing (bargain if you ask me), or 230 dollars which includes the recalibration/tax/fees.

What are they talking about?

That's about what I paid.

 

[ShadowsPapa]

Let me rephrase that. If you want the dealer to recalibrate for different size tires, the only option they offer is to sell you the prosnap and they do it. You do keep the prosnap.

That's an interesting way for them to handle it. I was told "we can sell you a device and you can do it yourself".
I opted for jscan and AlfaOBD.

Do they at least tell you that you have other options, or do they leave it at "if you want it done, this is the only way" sort of thing?

Heck, if you buy the device you sure as heck don't need them to do anything.

 

[Klicht87]

That's an interesting way for them to handle it. I was told "we can sell you a device and you can do it yourself".
I opted for jscan and AlfaOBD.

Do they at least tell you that you have other options, or do they leave it at "if you want it done, this is the only way" sort of thing?

Heck, if you buy the device you sure as heck don't need them to do anything.

I didn't dig to far into it. I was asking about it when I was going to lift my wife's JL before I bought my gladiator. They are an aev sponsored shop so I'm assuming that's why they only mentioned the snap. I think they wanted $200 for the snap, they calibrate and that was included in a $600 labor install for the Mopar lift. I never went through with it as I have since bought my own toy and have been doing things myself.

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