UO422 code will not clear

[DangerRanger84]

Hey guys, maybe you can help me make sense of this. 2021 Ranger Lariat with Ford Performance tune and Ford Performance ProCal4 tuner module. Ford Performance exhaust and 32.7” BF Goodrich KO2 tires.

I noticed that my throttle response seemed to be a bit less peppy so I pulled DTC codes and I get a persistent UO422 code “Invalid Data Received from Body Control Module”. I clear it but then recheck DTC codes immediately and it’s still there.

I updated my ProCal, return to stock tune and then reload the Ford Performance tune and it’s still there. After reloading the throttle response seems great and I’ve got no warning dash lights and everything seems to function just fine - other than this dang DTC code that won’t clear. The BCM module itself looks fine, all connections are solid. All fuses are good. OBD port is clean and ProCal wires are not bent.

I do have Baja Designs fog lights, LED side mirror lights and LED front fender lights that I’m wondering may be causing the fault…but not entirely sure if that’ll do it.

Could LED bulbs be causing this? Anyone else seen this? Any guesses as to what’s going on?

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[chrisakz]

I got the unclearable U0422 after adjusting my tire circumference with Forscan. BCM doesn’t seem like it and hasn’t caused any problems for me but can’t be cleared. I imagine the dealership could.

 

[airline tech]

Yes, as far as I know, (2) codes that are related are P106a and U0422
Are both invalid data from the BCM and will not clear.

My hunch is they are related to the Tune.

The manuals give ZERO direction for clearing the code other than reprogramming the PCM.
From what I have researched so far, even resetting back to stock tire size (if changed in Forscan) will not reset it either.

 

[RedlandRanger]

I got the unclearable U0422 after adjusting my tire circumference with Forscan. BCM doesn’t seem like it and hasn’t caused any problems for me but can’t be cleared. I imagine the dealership could.

This was my first guess. I have the same thing but it has never caused any issues in almost 2 years since it first happened.

 

[airline tech]

Just found this on the Forscan forum.

I do not know if any of these Tire Sizes match our Ranger (Forscan) Changes or not.

But it is interesting info: for those who have altered the Tire Size via Forscan

The poster of this was playing with the Tire Size changes to get rid of the code.

 

[chrisakz]

Just found this on the Forscan forum.

I do not know if any of these Tire Sizes match our Ranger (Forscan) Changes or not.

But it is interesting info: for those who have altered the Tire Size via Forscan

The poster of this was playing with the Tire Size changes to get rid of the code.

I personally am not bothered by the code but if I decide to play with Forscan or change my tire size again when my current tires are in need of changing I’ll look into this and see if the BCM is happy with certain sizes.

 

[tm1506]

Just found this on the Forscan forum.

I do not know if any of these Tire Sizes match our Ranger (Forscan) Changes or not.

But it is interesting info: for those who have altered the Tire Size via Forscan

The poster of this was playing with the Tire Size changes to get rid of the code.

Here's my short story long...I replaced the 265/65/17 LT Hankooks with 265/70/17 Cooper Discoverer Road and Trail so naturally my speedometer was off. At 60 it was 1 mph off and between 1 and 2 mph at 70 not much but I couldn't let it go.
So I jumped down the Forescan well and adjusted the circumference. The original setting was 2360 and I had seen somewhere in all the threads on this that 2400 was good for the 265/70/17. I changed that and the speedo was right on but I got the dreaded U0422 error code. I tried the PCM relearn and no joy. I stumbled across this thread and with a difference of 39mm or less over the original setting there were no errors. First I tried 2399 but still the U0422. I dropped down to 2398 (38mm more than original) no U0422 but P160A popped up. I then did the PCM relearn and no error codes! In disbelief I cleared the codes and ran DTC again still no error codes. Took the truck for a drive and according to Waze the speedo is right on at 60 and 70 mph. Ran Forescan again when I got home and no errors!!!

Big thanks to @airline tech for finding this table. At least for me only going up 38mm from stock zeroed in the speedometer and eliminated the error codes. YMMV!

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