The TPMS on my 2006 MCSCa has always worked fine. The yellow TPMS indicator light came on this week. I checked the tire pressures and three tires were down 1 PSI from the original setting and the fourth was down 2 PSI. I repressurized all four tires to 40 PSI, started the engine and held the TPMS reset switch down for about 10 seconds. The indicator light will not go out. I have tried this several time and the light stays lighted. What do I check next. Any ideas? Bad switch? Software glitch?

 

Drive.

You need to drive a ways after pressing reset. The system needs to compare the rotational speed of the wheels as part of the reset sequence.

 

The TPMS finally did reset on the 2nd day of driving; after about a total of 40 miles. Don't think it should take this long. In the past it has reset after five miles.

 

I have a 2006 and my TPMS has always reset in a few seconds, after driving barely 100 yds. TPMS relies on the rotational (ABS) sensor which may be going bad. Mine needed to be replaced recently.

 

hey rkw: when you're saying that TPMS relies on the ABS sensor -- you realize newer TPMSes aren't that way... do you know that the 2006 TPMS is the passive, abs-based ones?

 

2007 forward is when the direct monitors were used!

Alex

 

September 2007. Early 2007 still had the rotation-based FTM system.

 

We've seen it both ways in early 2007

Alex