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TPMS Fault after Firmware Update

Solarman004

Member
Apr 27, 2016
770
1,031
Colorado
Car: Aug 2016, AP1 MX; Software: 2019.32.12.3 1b89dd1

A forum search showed some MS owners having problems with the car not recognizing TPMS sensors of new tires, but my issue is a little different.

Immediately after the update to 2019.32.12.3, I get a continuous "Tire Pressure Monitoring System Failure" warning on the instrument cluster. On some trips, only one sensor shows up with no reading, but on other trips, all four sensors show no reading. The timing of the firmware update, plus the failed readings on multiple wheels leads me to believe these are related. These are the original TPMS sensors that came with the car and have been working fine until last week. The warning message is not a low pressure warning, and at 44 psi, all tires are above the 42 psi spec.

I will have my SC look at this next month when I go in for my 50,000 mile maintenance. But, I wanted to ask the forum group if anyone else is seeing this, or is this a specific problem with my car, and unrelated to the firmware update?

Thanks.
 

ShawnA

Supporting Member
Supporting Member
Nov 13, 2017
982
720
Edwardsburg, MI
Hi Solarman004,

At 50,000 miles and only a few years, it probably is software...
But if you are unlucky it could be the batteries croaking prematurely in the TPMS sensors...
If you have a friendly tire shop they can read your tires with their TPMS tool just to see
that they are working...
It might be a relief to know they are working before your service appointment...

Your choice,

Shawn (the TPMS guy)
 

Solarman004

Member
Apr 27, 2016
770
1,031
Colorado
Hi Solarman004,

At 50,000 miles and only a few years, it probably is software...
But if you are unlucky it could be the batteries croaking prematurely in the TPMS sensors...
If you have a friendly tire shop they can read your tires with their TPMS tool just to see
that they are working...
It might be a relief to know they are working before your service appointment...

Your choice,

Shawn (the TPMS guy)

Shawn, it turned out to be one bad sensor which I had replaced by Discount Tire (only $60).
What threw me off was that the one bad sensor was causing a 20 minute delay before the other 3 tires would show a pressure reading. So until I made a few longer highway drives, I thought I was getting no readings from any tire.
 

ShawnA

Supporting Member
Supporting Member
Nov 13, 2017
982
720
Edwardsburg, MI
Hi Solarman004,

That is good news thank you!

That 16 to 20 minute delay is very confusing... I understand it but it is still confusing.
I'm glad it worked out for you.

Shawn
 

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