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2021 Speedometer Calibration

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brc80

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Just picked my new 2021 2500 and am looking to upgrade from the craptasic factory tire so something a little bigger. Does anyone know if any company is able to correct the speedometer on the 2021's yet.

Thanks
 
Have read two posts recently of people using alphaobd and taser who had dealer issues. Taser had to do with tire size correction and alpha obd was something to do with fog lights i think
 
Hmm, I would just like to find a simple way to correct tire size and TPMS. Maybe Ill have to wait for hypertech to figure it out then.
 
brc80 said:
Hmm, I would just like to find a simple way to correct tire size and TPMS. Maybe Ill have to wait for hypertech to figure it out then.
Click to expand...
Aev snap or dealer
 
I have both the Ram Tazer and AlfaOBD.

I would recommend AlfaODB over the tazer as it has way more usefulness in adding features and making changes and adjustments.

There are hundreds of youtube videos that will walk you through the process of updating tire size.

I just went through the process again as I upgraded to 37 inch tires on my Power Wagon.

Biggest pain in the but with changing tire size is getting the circumference right for the new tires so the speed matches.

Usually takes a few tries to pick the right number.

If you need help let me know.

Sent from my SM-G998U using Tapatalk
 
Yes the 19-21s are all the same. As long as you get the KAOdTECH bypass cable or similar
www.kaodtech.com

Security Module Bypass | KaodTech

Will Ship 3-5 Business Days after OrderIf you have a 2018 - 2024 RAM and would like to perform diagnostics or make changes to the modules of your truck using tools like AlfaOBD or AutoEngenuity, this bypass is for you.Does this allow access to all modules?It has been tested connecting to the BCM...
www.kaodtech.com www.kaodtech.com

Suggest the OBDLink MX+ OBD2 module
https://www.amazon.com/dp/B07JFRFJG...abc_7DRE2A1VJ2HR16023A6P?_encoding=UTF8&psc=1

and the AlfaOBD App for Android or iPhone

Sent from my SM-G998U using Tapatalk
 
Do i need a bypass cable or anything like that? Sorry new to the Ram world.
 
Yes. See my previous post

Sent from my SM-G998U using Tapatalk
 
3500 2021 and did the calibration with alpha obd , works good
 
Sweet, answers I was looking for.
My 2021 3500 is reading about 5 MPH slow at highway speeds on 37s.
I have an OBDLink MX and AlfaOBD.

Didn't realize I needed a bypass cable, that is good to know.
 
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