I wanted to share my experience with successfully calibrating my 2025 F350 6.7 with aftermarket suspension upgrades and 37" tires.

First step is correcting the speedometer mismatch caused by upgrading to a larger tire size. Using the FORScan info on FTE, I set the tire circ mm value to 2799. This resulted in a precise speed match with GPS for my application.

Second step is correcting the CCM radar misalignment caused by upgrading the suspension (approx 5.5" truck lift). This required adjusting the radar sensor in the front bumper to be exactly perpendicular to the ground (truck parked on a level surface).



The third step is to run the CCM calibration procedure in FORScan which involves driving 10-15 min at moderate speed on a straight road with targets (traffic signs, obstacles, etc.) for the radar.

Upon successful completion of all three steps, the CCM DTC B142E:78-AF is cleared and the "Pre-Collision Assist Not Available" alert is removed.

My speedo and mileage are now accurate and the Adaptive Cruise Control functions as it did when the truck was stock.

 

@JW350
Glad you got it, 2799 tire value can be elusive sometimes. Did you run the PCM/TCM relearns ?

Great info on the CCM calibration.

Post a photo of your truck

ZooDad

 

Yes, for the tire size update I ran the PCM, TCM, and AWD relearn procedures (in that order). Thank you @ZooDad for your contributions on FORScan!

 

I got everything done but must be doing something wrong. In FORScan is a calibration an on demand self test? It seems like it won’t take it. I’m on flat ground and used the same level.

 

I am far from being a FORscan expert and I have not touched it since my fix 3 months ago.

Based on what others have experienced, you might try the following:

• Try small incremental values less than the max of 2799 (37" tire). That value seems to work on some, but not all trucks.
• Follow the FORscan prompts that instruct key/button on, engine off or engine on/off. I paused at least 45 seconds between events.

I suspect (no proof) that the adaptive cruise control requires precise MPH calibration as an input to its function.

 

Sometimes you need to drive truck several miles between starts and stops for it to recalibrate. Be patient and post back your results. Wish I could help more.

 

Short version of the update:
I was able to change the circumference to 2799mm. At 78 mph on the dash the gps says 78&79 depending on I’m assuming the decimal and the way speeds round in the gps. That is so close it’s not worth messing with. 75 is 75. 20 is 20. 35 is 35 etc.

What I had issues with on my vehicle:
I tried changing the tire size of my truck using EZLYNK to 37”. By doing so I threw a few codes. P0160 or something like that and the one mentioned above for the cruise control . I apologize for not having the code specific. On the truck itself there were a few messages:
Service engine soon
Service 4x4
Adaptive cruise not available
Pre collision blah blah not available

What I have learned:
the codes are a mismatch and mix between programming and mismatches between the modules as well as my altered ride height (2.5” coil level on 37” toyos)

Cruise control and pre collision are out because the camera and the radar do not align.

Service 4x4 and service engine soon are out because by changing the tire circumference to 37”, the BdyCM now will not match the programming of the PCM, TCM, and the AWD modules. This is the wrench that won’t go away on the cluster.

MEAT AND POTATOES
This is what I struggled with but now figured it out. When you connect FORScan to your truck DO NOT LOAD A PROFILE AND DO NOT SAVE A PROFILE. After the modules come up you will see the CCM and AWD listed on the main page where you connect and disconnect in FORScan.

First things first click on the “configuration and programming” (C&P)icon. Select BdyCM search tire. Take a picture of that number for future needs if any. Change that number to 2799m if you have a 37” tire. Write the change and cycle ignition power.

Go back the the C&P page. Click on “PCM - module initiation/relearn from central configuration” and complete that.
Go back to C&P and click on “TCM - module initialization/relearn from central configuration” and complete that.
Go back to C&P and click on “AWD - module no initialization/relearn from central configuration”

Cycle power on ignition
Go to DTC page and clear codes. Cycle power again.
your wrench should be gone and engine light if you still had one.


Follow the steps from above to align the radar sensor. You’ll need a small flat head, small level, 7/16 socket and E6 torx socket. I used Milwaukee 48-22-5603 pocket level from home depot. It’s 21$.

Now once you are leveled out drive to a flat highway/interstate where it’s relatively straight and MUST NOT BE HILLY. pull over at the on ramp and put your truck in park. Click on “Service procedures” in FORScan. Scroll to “CCM - calibrate, cruise control sensors”. Click the 3 oks before shifting to drive. Drive over 30 mph.

my truck failed 3 times. Stops, hills and turnaround make the process unbelievably slow. I drove for 2 hours failing hanging up at 67, 88 and 94%.

During the evening/dark I made a long drive on the interstate. it took 5 minutes. It will stop at 99%. Just keep driving and it will do a cycle after a few minutes and say completed.

NOW my cruise control still doesn’t work HOWEVER I have been told a takes a few key cycles and drives. I will update you going forward if cruise control returns.

update: less than 24 hours and I noticed the light disappeared. Maybe it was cleared already and I just didn’t realize it but cruise works and everything is normal. Good luck everyone

I’d like to thank you @JW350 for your assistance because I was at the end of the road until you directed me to this forum. I do not think I would have cruise control without your guidance. Thank you for your assistance and hopefully this helps those stumbling onto this thread in the future.

My truck is a 2024 f250 SO 6.7 short bed crew cab fx4. I will post a link to YouTube for a video later for guidance.

As promised:

Alex

 

how did yall get the CCM to come up mine does not show up thanks

 

you cannot load a profile. That’s the only way I was able to get CCM to show up

 

When are they doing the rear lift? Front looks great. You’ll have to redo the ccm procedure when all done.

 

First off thanks for the video and write up. Going to use this thread when I get my truck.

Can you increase the value past 2799 for 38’s or 40’s?

See this thread has some info on this same topic.
https://www.fordtremor.com/threads/speedometer-forscan-fix-for-37-inch-tires.4709/page-5

Interesting that this is the only place I’ve read about having to do the cruise control reset process.

 

I did that i will try again tomorrow

 

I truly never tried I don’t want to lie to you

 

interesting…I unfortunately do not know any other way

 

Hi:
I'm trying to do this on a F350 Tremor with 5" lift and 38's. I have a few questions/observations that I'd appreciate any feedback that might be available.
1: The circumference for 38's is 3032 (theory), if I enter this value I get all sorts of errors saying the value is out of range for the module (PCM/TCM/AWD)
Is there a known max value. If I use the 37's value then the speedo is ~1mp less that GPS. Not sure if that is close enough for the calibration to work.
2: After making the initial change (for the 38's) the steering 'feel' changed completely - anyone experienced this? It stayed that way even after resetting to stock tire value. This finally cleared after driving and some forward/reverse and stop/starts, so not sure about the cause.
3: I have 4 DTC error codes with the IPMA (Image processing module) that won't clear no matter what? Is this error normal until the Adaptive cruise is fixed or is it pointing to some other problem?
Any thoughts/comment's or suggestions are much appreciated.