Another TPMS thread (not a failure - but not sure it is a success either)

[Andrews Chalmers]

Our TPMS light went on while we were returning from a roadtrip last night - pulled over, visually inspected the tires & decided to finish the drive home since we were so close to home.

Got up this morning - checked the cold tire pressure 31, 30, 30, 31 - thought it was odd because I believe the manual states that the TMPS light will come on only if the tire pressure falls below 28?

Anyway - I pumped up the tires to 33 psi. Took it out for a drive & the light did not go off until about 9 miles later.

Was there a system failure ---> false positive? Or is this normal?

[biggie]

Possible that one did go below 29psi I guess. But if it went off after you upped the pressure then I wouldn't call it a failure, cause it would have stayed on.

[rwanttaja]

Our TPMS light went on while we were returning from a roadtrip last night - pulled over, visually inspected the tires & decided to finish the drive home since we were so close to home.

Got up this morning - checked the cold tire pressure 31, 30, 30, 31 - thought it was odd because I believe the manual states that the TMPS light will come on only if the tire pressure falls below 28?

Anyway - I pumped up the tires to 33 psi. Took it out for a drive & the light did not go off until about 9 miles later.

Was there a system failure ---> false positive? Or is this normal?

The failure mode on the TPMS is pretty definite: When you turn the car on, the warning light flashes for one minute, then stays lit. If the light goes out after adding air, you don't have a TPMS system failure.

My guess is that the calibration is off on either one of your TPMS tire sensors or your own tire gauge. More likely the sensor, but no cause for alarm, either way....

Ron

[Jaesin]

How cold was it when this happened? If you tested the air pressure after the tires had time to warm up, it could be just a cold air (denser, therefore less pressure) induced warning.

I also think this is the reason why the sensors require 33psi+ to go off again. One cold morning I had the sensor go off, tires looked fine, warmed up the next day and the light went off with no additional air being added.