@Ford Motor Company-Does tire size change void drivetrain warranty

So the P160a code is related to tire size change and not updating in forscan
C05D9 is related to a battery issue and there is a TSB on it
U0403is related to a faulty transfer case module.
not sure if the tire change would cause the other two. My guess is that the first code for sure is because of a Forscan update issue. Research the codes and possible causes and then talk to the service guy. A lot of places bet on us being uninformed.

TK1215

One last question for you. When you did the tire change did you update the vehicles computer via Forscan?

Knowing that your answers are reputable, can you direct me to something that can tell me specifically how to go about this procedure? I have Forscan and am a bit familiar with it (I used it to modify my audio settings) but some of the Forscan forum entries that relate to this topic have a very seat-of-your-pants feel to them and it's difficult to trust them. I recently upgraded my tires (35" on standard aluminum BD rims) and suspect my speedometer (and associated metrics) may be off by a bit.

Umichigan

Knowing that your answers are reputable, can you direct me to something that can tell me specifically how to go about this procedure? I have Forscan and am a bit familiar with it (I used it to modify my audio settings) but some of the Forscan forum entries that relate to this topic have a very seat-of-your-pants feel to them and it's difficult to trust them. I recently upgraded my tires (35" on standard aluminum BD rims) and suspect my speedometer (and associated metrics) may be off by a bit.

As of yet, I haven’t made any changes that have required Forscan adjustments. But I know that there are numerous members who have. I know that my Badlands with Sasquatch has always run about 1.5-2 MPH faster on the speedometer than actual speed. And that @SlashRacer was the same. He recently went up to 37” tires and his MPH is now spot on with no Forscan changes. I would say that unless you find someone here or on 6G with a definitive how to, have your dealership technician take a look. Try reaching out to @RagnarKon with a PM. I know that he is solid with the technical how to’s

Here is a short and simple version I found that isn’t a video. Nuts and bolts
https://radbroncoparts.com/blogs/news/how-to-recalibrate-your-bronco-speedometer

extra toasty

Only on the part that broke. So essentially equates to no powertrain warranty if Ford says your mod caused the issue.

That does not equate to "no powertrain warranty," it equates to denial of a one specific claim - that hardly means the entire warranty disappears.

YOLO

That does not equate to "no powertrain warranty," it equates to denial of a one specific claim - that hardly means the entire warranty disappears.

Only on the part that broke. So essentially equates to no powertrain warranty if Ford says your mod caused the issue.

I said “if”…
They can deny multiple claims. You only care about a warranty coverage on broken parts.

extra toasty

Only on the part that broke. So essentially equates to no powertrain warranty if Ford says your mod caused the issue.

I said “if”…
They can deny multiple claims. You only care about a warranty coverage on broken parts.

Yeah, but something else could break tomorrow that IS covered. OP still has a warranty, even if one claim was denied.

rmedina1

This is a question for the FORD MOTOR COMPANY(FMC):

Does changing the tire size on your Bronco void the drive train warranty? for example, changing the tire size from 255/70R18 to 275/70R18. Please answer and don't direct me to a dealer because, at the end of the day, they are not the FMC. They only have their best interest and pocket in mind. Thank you in advance.

As a dealer mechanic and shop foreman, it is up to the dealer's discretion if most things are warrantable. That being said, you would have to find a really shady dealer to be picky enough to void warranty over tire size. You might not get NVH warranty, but all other should be 100% good.

As a dealership mechanic and shop foreman, I try to err on the side of warranty as much as I can unless there's something that ties my hands. I'd much rather call you and you're car is all set and you owe nothing than tell you that you owe anything

Unless I can prove 100% that a modification caused a failure or caused damage, I view it as a warrant able concern.

Stonekoldk

As a dealer mechanic and shop foreman, it is up to the dealer's discretion if most things are warrantable. That being said, you would have to find a really shady dealer to be picky enough to void warranty over tire size. You might not get NVH warranty, but all other should be 100% good.

As a dealership mechanic and shop foreman, I try to err on the side of warranty as much as I can unless there's something that ties my hands. I'd much rather call you and you're car is all set and you owe nothing than tell you that you owe anything

Unless I can prove 100% that a modification caused a failure or caused damage, I view it as a warrant able concern.

Exactly what my service guy told me

TK1215

Exactly what my service guy told me

Huh. Don’t think so…

Stonekoldk

As a dealer mechanic and shop foreman, it is up to the dealer's discretion if most things are warrantable. That being said, you would have to find a really shady dealer to be picky enough to void warranty over tire size. You might not get NVH warranty, but all other should be 100% good.

As a dealership mechanic and shop foreman, I try to err on the side of warranty as much as I can unless there's something that ties my hands. I'd much rather call you and you're car is all set and you owe nothing than tell you that you owe anything

Unless I can prove 100% that a modification caused a failure or caused damage, I view it as a warrant able concern.

To error on the side of warranty on an altered vehicle sounds like a dealer’s self servicing way of taking advantage of Ford. It’s funny how folks think it’s ok when advantageous dealers benefit them but scrutinize them when they fall into the short end. Double standards.
The rules of “ you play, you pay” come to mind.
A dealer doesn’t have to prove 100% of anything on a warranty claim. That burden falls totally on the customer.

extra toasty

Huh. Don’t think so…

Great looking rig! What suspension/gearing updates did you go with? And more importantly, how has the on and off road ride and stability change?

Keeping Nag Dirty

extra toasty

To error on the side of warranty on an altered vehicle sounds like a dealer’s self servicing way of taking advantage of Ford. It’s funny how folks think it’s ok when advantageous dealers benefit them but scrutinize them when they fall into the short end. Double standards.
The rules of “ you play, you pay” come to mind.
A dealer doesn’t have to prove 100% of anything on a warranty claim. That burden falls totally on the customer.

That burden does fall on the customer yes, but general policy is, if you can't prove that the modification caused the damage or failure, it's the dealerships discretion to warranty or not. If the only change is tire size and nothing or not much else, I would err on warranty side depending on failure. Now if it was heavily modified, customer responsibility.

TK1215

Great looking rig! What suspension/gearing updates did you go with? And more importantly, how has the on and off road ride and stability change?

Ha! Not my rig, just another example of voiding a powertrain warranty. But who really cares. If you got the 25k or so to do this type of mod, a warranty isn’t an issue.
Yep cool look but I think 40’s are a bit overkill. Especially for on-road dynamics.

Thank you all for the comments, The only "modification" I have done to the drivetrain has been the tire size change I indicated, I am currently dealing with a representative from Ford. I'll detail the outcome and assistance Ford provides.

extra toasty

To error on the side of warranty on an altered vehicle sounds like a dealer’s self servicing way of taking advantage of Ford. It’s funny how folks think it’s ok when advantageous dealers benefit them but scrutinize them when they fall into the short end. Double standards.
The rules of “ you play, you pay” come to mind.
A dealer doesn’t have to prove 100% of anything on a warranty claim. That burden falls totally on the customer.

The only "modification" to the vehicle was a tire size change from 255/70/18 to 275/70/18, and I have been dealing with a drivetrain issue since December 2023 with NO modifications. All documented, every time I brought it to the dealership, they claimed I had altered the vehicle to try and charge me for "service". Example: the first time I had brought the Bronco in was for a check 4x4 warning indicator, I brought it in for service. They claimed "I installed something" in the OBD port they had never seen before and caused damage to the AWD module which in turn caused the grinding noise I was hearing. Turns out the "I installed something" was a dealer-installed LoJack system that was installed by the dealer I purchased my Bronco from BRAND NEW in 2021. That dealership had to fax them the info or else I was on the hook.