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I hit some rough road on a severely patched bridge at speed the other day in my 2014 C350 Sport (RWD). I got a dash message that said the TPMS was temporarily unavailable. Checking the tire pressures, the right front showed dashes while the other wheels showed the tire pressure. I kept driving and checked again after a few minutes. Everything was back to normal. Is this a sign of imminent failure? Is something loose or is the TPMS sensor battery about to expire?
I hit some rough road on a severely patched bridge at speed the other day in my 2014 C350 Sport (RWD). I got a dash message that said the TPMS was temporarily unavailable. Checking the tire pressures, the right front showed dashes while the other wheels showed the tire pressure. I kept driving and checked again after a few minutes. Everything was back to normal. Is this a sign of imminent failure? Is something loose or is the TPMS sensor battery about to expire?
Thanks
Would a TPMS programmer show the charge level of the sensors? Or it just cuts out completely is when you know it needs to be replaced?
I hit some rough road on a severely patched bridge at speed the other day in my 2014 C350 Sport (RWD). I got a dash message that said the TPMS was temporarily unavailable.
Checking the tire pressures, the right front showed dashes while the other wheels showed the tire pressure.
I kept driving and checked again after a few minutes. Everything was back to normal.
Is this a sign of imminent failure? Is something loose or is the TPMS sensor battery about to expire?
Thanks
How old are your current wheel modules ?
You may need replacement around the corner.
Can your MB scanner read data from your TPMS module ? See what's available...
The chassis module receives the wheel data when modules are not asleep.
I will have to play with my scanner (LAUNCH X431 PROS V.5) to check to see if the battery levels are available. I do have the LAUNCH i-TPMS TSGUN activation and programming tool, in addition to the TPMS module access through the scanner. When I ran the program earlier using my scanner it did detect and display the ID numbers for all the sensors.
My TPMS sensors are probably original, meaning they are 12 years old and the batteries are likely about to puke. I had all the modules replaced on my SL400 last fall when I got new tires at Costco. But I now have a set of genuine Mercedes sensors that I will probably use when I need new tires on this car (2014 C350).
NOTE: The latest LAUNCH update for Mercedes is 50.56 on the Creader Elite scanners.
I will have to play with my scanner (LAUNCH X431 PROS V.5) to check to see if the battery levels are available. I do have the LAUNCH i-TPMS TSGUN activation and programming tool, in addition to the TPMS module access through the scanner. When I ran the program earlier using my scanner it did detect and display the ID numbers for all the sensors.
My TPMS sensors are probably original, meaning they are 12 years old and the batteries are likely about to puke. I had all the modules replaced on my SL400 last fall when I got new tires at Costco. But I now have a set of genuine Mercedes sensors that I will probably use when I need new tires on this car (2014 C350).
NOTE: The latest LAUNCH update for Mercedes is 50.56 on the Creader Elite scanners.
Wow 12 years is quite a long time. you don't drive a lot so they are constantly in hibernation mode? Or I just underestimated the lifespan of a TPMS sensor?
The car has 140k miles. It’s not driven a lot now, but it was when I was working. My round trip was 130 miles. I figured I put about 800 miles per week on the car.
The car has 140k miles. It’s not driven a lot now, but it was when I was working. My round trip was 130 miles. I figured I put about 800 miles per week on the car.
Maybe older TPMS sensors have better battery life then.
Interesting! Looking the part number up on FCP Euro, the TPMS looks entirely different. So, you may have a point. Note the applicable date in the description. My car was built in October 2013, before the date listed.
Interesting! Looking the part number up on FCP Euro, the TPMS looks entirely different. So, you may have a point. Note the applicable date in the description. My car was built in October 2013, before the date listed.
Thanks for your question, no I haven't needed to replace my sensors yet, mines a 2017 model year car though.
Edit: So they cheap out on the battery with the newer sensors? Hence why the older ones last so long compared to the new ones? I don't think TPMS sensors advanced at all in technology, there is no point of modifying it when it just works. If they updated the part number, other than the frequency change then they might have messed with the battery, but why?
Last edited by W205C43PFL; Jun 19, 2026 at 02:53 PM.
this is where technology meets the edge...
The programming tool reads all coin-cells as Normal status.
At the dame time, transmit range is getting shorter after 12Yrs.
Your wheel senfirs are on the edge of flipping from Normal to Abnormal.
The module doesn't have a lot of energy to spare to run self-checks - This way it last longer before failing.
I wonder if this Schrader TPMS status is integrated in safety modules like ESP/ABS.
Bosch ESP use to run its own primitive "wheel warning" by comparing individual wheels Rpm's differences.
Having non-working TPMS may disable safety logic - Keep us posted once your sensor really flips to sleep.
...I wonder if this Schrader TPMS status is integrated in safety modules like ESP/ABS.
Bosch ESP use to run its own primitive "wheel warning" by comparing individual wheels Rpm's differences.
Having non-working TPMS may disable safety logic - Keep us posted once your sensor really flips to sleep.
Well, I got no other warnings like PRE-SAFE unavailable or ESP disabled when the TPMS Unavailable popped up, so I don’t think the two systems are connected. But, as you said, the Bosch system used in other countries may impact safety modules.
As my high school science teacher would always say when asked a question he couldn’t answer, “Sounds like a good research project, Mr. PotatoHead."
Well, I got no other warnings like PRE-SAFE unavailable or ESP disabled when the TPMS Unavailable popped up, so I don’t think the two systems are connected. But, as you said, the Bosch system used in other countries may impact safety modules.
As my high school science teacher would always say when asked a question he couldn’t answer, “Sounds like a good research project, Mr. PotatoHead."
yep! Stock "Pre-Safe disabled ..." IC warning messages are solved by Reboots and not having voltage transients.
> SOLID INSIGHT...
Obviously WIS doesn't provide us with 100% module design notes
No problem: the list of DTC's give us a more precise idea of what are the partner modules and what transactions are involved.
Direct the highschool potato-head to scroll through TPMS module applicable DTCs and then ESP or others from Xentry.
Last edited by CaliBenzDriver; Jun 19, 2026 at 09:44 PM.
I’m thinking the rough road gave those poor old TPMS sensors are real shakeup. The sensor portion and the stem portion of the TPMS can pivot a little. Not sure why they are made that way, maybe to fit different wheels, but they are hinged. At normal driving, the centrifugal force will cause the sensor portion to flatten out and remain in contact with the wheel (rim). But the rough road could have caused it to momentarily flop a little, causing distress to the sensor.
Old style (current)
New style
Here are the DTCs that were stored.
Last edited by PotatoHeadII; Jun 20, 2026 at 10:01 AM.
I’m thinking the rough road gave those poor old TPMS sensors are real shakeup. The sensor portion and the stem portion of the TPMS can pivot a little. Not sure why they are made that way, maybe to fit different wheels, but they are hinged. At normal driving, the centrifugal force will cause the sensor portion to flatten out and remain in contact with the wheel (rim). But the rough road could have caused it to momentarily flop a little, causing distress to the sensor.
Old style (current)
New style
Here are the DTCs that were stored.
So the new style TPMS sensors with poorer battery life but improved durability?
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