Speedometer Forscan Fix for 37 Inch Tires
- OP 🔹 omcvay
- Start date
- Sep 12, 2022
- 209
- 330
- 2022 F450 Platinum Shortbed by DBL Design
- 2017 Porsche 911 Turbo S & 2021 Polaris Pro XP 4
scroll up and post the log before you did the relearn please, just curious what that says
Ok. I’ll have to run through the process again and take a picture. I’ll do it tomorrow. Thanks
- Oct 26, 2020
- 2,090
- 4,386
- 2021 Tremor 6.7L Lariat Ultimate / Lariat Black
- 2023 Corvette C8 Stingray R
This thread has lived on for more then 2.5 years, so I wanted to comment again for the new members. I followed the instructions exactly on my 2021 and I could not get it to work without throwing codes. I changed mine back to the factory settings and I have been driving it for almost three years without worrying about the 2-3 MPH difference.
Any update if you got it fixed?
Nope. Forgot to take a picture of the relearn. But no matter what I do, it throws a code
Same! Mine runs 2mph lower than actual at 80MPH. I guess I’ll just have to leave it as is. Kinda dumb it won’t accept another tire diameter
- Sep 12, 2022
- 209
- 330
- 2022 F450 Platinum Shortbed by DBL Design
- 2017 Porsche 911 Turbo S & 2021 Polaris Pro XP 4
I have installed a few of the hypertech inline speedo calibration devices on 2023 F550's. It worked fine BUT your cruise control is now going to be off by the same amount as your speedo calibration. So if your speedo is off 4mph and you add that into the inline adapter to make your speedo correct, your cruise control will be off.
For example: you are driving 70mph, enable cruise control, the set point will be set at 66mph. This is a side effect of the new digital dash. My truck is getting some upgrades installed so I haven't had it to compare but I don't remember my cruise control being off in my 2022 with the inline speedo calibrator. I will test it out next weekend and circle back.
On my 2022, I was able to correct the speedo using the 2770 value without dash lights/error codes for 37x12.5x20’s. It’s dead accurate when comparing multiple different gps speed apps. Did the PCM/TCM relearn after changing the value, didn’t touch axle ratio either. Weird because my truck speedo was 2mph fast from the factory so that helped close the gap when going to 37’s.
Can’t get the 2770 value to work on mine even after multiple attempts and relearns. Damn thing
- Sep 12, 2022
- 209
- 330
- 2022 F450 Platinum Shortbed by DBL Design
- 2017 Porsche 911 Turbo S & 2021 Polaris Pro XP 4
PM or Text me and I can do a zoom session with you. We may need to tweak your gear ratio setting to get to play nice.
I appreciate the offer! Not super comfortable playing with the gear ratio at the moment. If I change my mind I’ll let you know. Once again, thx for the offer
Don’t take this question the wrong way, but did you click “write” or “confirm change” after entering 2770? I’ve got a habit of just hitting the enter key so it never hurts to double check those easy fixes. Good luck man wish I could be of more help
has anyone been able to get a 37" (2770) value to work without lights/codes on a '23-up truck?
Just wanted to say thank you to this site and specifically to @omcvay for this post.
I installed 37's the other day then went to update in Forscan and sure enough experience the same CEL and DTC P0610 as everyone else. I went through a number of other forums and sure enough the answer was right here on the Tremor forums. Post number one answered and solved the issue and I now have a clear dash. Thanks again for the great post and info.
I installed 37's the other day then went to update in Forscan and sure enough experience the same CEL and DTC P0610 as everyone else. I went through a number of other forums and sure enough the answer was right here on the Tremor forums. Post number one answered and solved the issue and I now have a clear dash. Thanks again for the great post and info.
Just wanted to say thank you to this site and specifically to @omcvay for this post.
I installed 37's the other day then went to update in Forscan and sure enough experience the same CEL and DTC P0610 as everyone else. I went through a number of other forums and sure enough the answer was right here on the Tremor forums. Post number one answered and solved the issue and I now have a clear dash. Thanks again for the great post and info.
Don’t be surprised if your transmission, specifically shifting, starts acting weirdly soon.
You will notice that lots of times the OP does a write up but never returns to update the forum on how the change held up over time.
Speedometer Forscan Fix for 37 Inch Tires
Edit: I can’t remember for sure if it allows you to use non-standard axle ratios. If it doesn’t, you’d need to move it down to the next lower standard ratio (from the example above it would be 3.55) and then move the tire circumference as well. (Standard ratio / calculated ratio) * tire...
www.fordtremor.com
Don’t be surprised if your transmission, specifically shifting, starts acting weirdly soon.
You will notice that lots of times the OP does a write up but never returns to update the forum on how the change held up over time.
Speedometer Forscan Fix for 37 Inch Tires
Edit: I can’t remember for sure if it allows you to use non-standard axle ratios. If it doesn’t, you’d need to move it down to the next lower standard ratio (from the example above it would be 3.55) and then move the tire circumference as well. (Standard ratio / calculated ratio) * tire...
Thanks for the heads up. I'll keep an eye on that. Might have to go ahead and readjust. Have you seen any other methods for getting rid of the CEL and DTC?
played with my 23 trying to resolve this as well. My f150 was a piece of cake compared to the 250. 2780 was my true to gps number but could not get it to clear dtc U0422. No lights on dash but if you pull codes it will show up. process I followed was set the tire circumference, this would then set the wrench light and 4wd messages with a p160A code. I would relearn the AWD module and that would clear all the lights on dash and P160A. I would reset and then pull a new DTC list and the u0422 code would show. I would relearn the PCM and reset and repull the DTC and the U0422 would still be present. I drove couple hundred miles like this and noticed no issues with truck. I rechecked DTCs and a new one was present for the seatbelt, I forgot the code number. I tried several more 2700 ranges and all ended with the U0422. I then set it to 2699 and all codes cleared.. It seems to me the 23s or at least mine will not take anything over 2699. I noticed when I was relearning the PCM when trying several 2700 range numbers, during the write the log would say Tire circumference not in database. Trucks 2.5 off actual so not bad. At least all the other updates worked with no issues.
