recommendation on replacing BCM vs TPMS

[dsga1]

Hello All -- looking for recommendation for ongoing issue with TPMS sensors.

Vehicle: 2020 Ford Explorer ST -- 20in wheels (thank goodness).

Scenario:

1. started seeing TPMS sensor issues on dash following ignition ON. first it was one or two. then all.
2. searched google and this forum and found thread HERE about buying new TMPS sensors off Amazon, with correct frequency for FORD, and using Motorcraft TPMS sensor tool to identify the placement for each TPMS sensor.
3. I did TEST RUN with new TPMS sensors in box (ie. not installed). I put auto in learn mode, grabbed each TPMS sensor and held it by itself (away from others) and used Motorcraft tool to identify each corner of vehicle.
4. Learn was successful and I put all sensors back in box and placed box in magazine holder behind DRIVER seat (ie. in vehicle).
5. For 2-3 days, the wheels were reading 2lbs and throwing a warning about low pressure. Important: no errors.
6. Flash to 4th or 5th day and now startup back to original issue: Sensor system error and no pressure on any wheel.
7. What is next step:
   1. I've read that BATTERY at this age could be source of issue.
   2. I've also read that this could be sign that Body Control Module could need replacement (or at least attention -- maybe reseat of connectors and/or fuse review). I have been looking into the BCM clone service offered by some service shops.

What are your thoughts and suggestions?

Thanks -G

FORscan output --

===BdyCM DTC B124D:02-8A===
Code: B124D - Tire Pressure Sensor

Additional Fault Symptom 02):
- General Signal Failure

Status (-8A):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Body Control Module

===END BdyCM DTC B124D:02-8A===

===BdyCM DTC B1182:00-8A===
Code: B1182 - Tire Pressure Monitoring System

Status (-8A):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Body Control Module

===END BdyCM DTC B1182:00-8A===



reference elsewhere:
https://www.explorerst.org/threads/tpms.8416/

 

[Cdubya]

BCM failure would be unusual.
TPMS end of life is the norm for all 2020's out there.

Just get the new TPMS installed

 

[dsga1]

Hello and thanks for msg. sincerely!

the issue is that my 4x newly paired TPMS sensors should work for YEARS before losing connect to Vehicle. The fact the sensors are NOT installed in the tire is somewhat irrelevant, right? There's no way the Vehicle systems would know a paired TPMS sensor was inside tire - or inside cabin?

Because the newly paired TPMS sensors lost "sync" after FOUR days, I'm thinking there's something more serious wrong with the auto.

make sense?

BCM failure would be unusual.
TPMS end of life is the norm for all 2020's out there.

Just get the new TPMS installed

 

[Cdubya]

You are making a lot of assumptions. I don't think keeping the new TPMS in the cabin is a good way to test them. Please do us a favor and just install them. The Ford system automatically relearns the TPMS sensors and knows which ones are in which wheel after a short drive. Keeping them in the cabin, it probably doesn't know what's what and errors out.

 

[UNBROKEN]

You are WAY overthinking this. Go have the new sensors installed.