Special thanks goes to Indytruckchampion(CF member) for creating that thread with the process and to articsilber323 for figuring out that the Autel Maxisys can do this, and thanks to @4x4x4door created this update. PLEASE read the common questions below before asking questions.
General info:
To fully adjust the TPMS you need to change the threshold psi settings and update the RFH (Radio frequency hub).
Factory pressure settings are 60(Hemi) or 65(Cummins) front & 80 rear with a 20% threshold which means that the warnings (light, sounds & nag screen) will come on at 48(H) or 52(C) front & 64 rear. If that happens then you will have to air the tires to 60(H) or 65(C) front and/or 80 rear to make the warnings go away.
The PIN – You must have your PIN to fully adjust the TPMS system. There are 2 PIN numbers associated with your key and truck. Technically, there’s a 3rd one too that’s a rolling code (unknown digits) that expires. It is only used if you lose all your keys and it requires a call to Lord FCA to get. I believe this is where some dealers get confused and try to tell you that the 4-digit PIN will expire. I’ve not heard of anyone saying that theirs expired when they tried to use it. A few members have been charged a fee to get the code. This ridiculous and I’d find another dealer, but I realize some don’t have that choice.
PIN #1: 4-digit code (all numbers) that is used to program the key (fobik) to the truck. This is the one you need for this process.
PIN #2: 5-digit code with a letter in front (ex. M0000) that is used to cut a new metal key.
It’s a good idea to get both codes as soon as you possibly can. Recently, some dealers have refused to give them out.
Devices:
Autel MaxiSys — will adjust the psi settings and update the RFH (Radio frequency hub)
Launch X431 — very similar to the Autel MaxiSys with possible same functionality (unverified)
Matco Maxgo & Maxme — supposed to be able to adjust the psi settings & update the RFH (Maximus should also)
AutoEnginuity software — will only adjust the threshold psi settings (also custom tire sizes & enable fogs w/highs)
Witech (dealer) — will only update the RFH, IF you can find a dealer that’s willing do it
AEV ProCal — only sold with their lift kits; will only adjust the psi settings (tire sizes & other settings)
Snap-on – no one has found that any of their devices can do this
Common questions:
Q: Can the dealer do this?
A: They cannot change the threshold psi settings but they should have the ability to update the RFH. Whether they will or not is questionable.
Q: Will this ‘change’ get removed if I get a flash update from the dealer or if I install a tune.
A: No
Q: Will this ‘change’ void my warranty.
A: First they have to prove that it caused a problem. Next how they gonna ‘see’ it since the Witech can’t get to the settings? BUT anything’s possible.
Q: What model of Autel MaxiSys can do this?
A: The common model is MS906 but any MaxiSys model should have this ability excluding Dodge software version 7.5.1. The MaxiDAS cannot do this process and I doubt any MaxiTPMS will either.
Q: Can the Autel MaxiSys make other adjustments like larger tires or enable fogs w/highs?
A: It’s a very powerful diagnostic device but it can only adjust to other factory tire sizes and cannot enable fogs w/highs.
Q: Where can I find the instructions do make the adjustments?
A: CF member articsilber323 provided them in post #912 in the original thread. Some of the screens have changed slightly with the newer software versions but the process is generally the same.
Credits to https://www.ramforumz.com/threads/how-to-set-tpms-to-any-pressure.236787/
www.obd2shop.co.uk is available with authorized Autel MaxiSys, Launch X431 etc.
