TPMS Oddity

[08Bluesky]

Yesterday, driving to work, the TPMS light came on within 2 blocks of my destination.
Continued to work, hopped out and checked the tire pressures. Most were 31, one was 29. Being that it was the first cool morning we’ve had in the burgh, I figured it must have been the 29 tire.
Later in the day I drove on home (13 miles) and checked the pressures again (no difference) and brought them all up to 32 and looked for screws/nails – found none.

Fired up the car and the TPMS was still lit. Thought? Perhaps a battery in the TPMS may be going out? So I grabbed my Tire Learn Tool (to test the communication) and did a quick “Learn” procedure – all seemed normal, started the car and still the TPMS was lit.

Later that eve I ran off to a store, Light still on, made a couple of stops and after a few more – “The Light was OFF” WooHoo!

No Light this morning.

Did the “System” need a few “Key Cycles” to Reset?

 

[Natesriv]

no... you need to ensure you're at the proper PSI... Probably 36. If it flashes when you start the car, then stays on, it's a bad TPMS, if it's solid, it's a low tire. 32 PSI seems about 4 psi low.
Same thing JUST happened to me 36 PSI stopped it.

 

[6speedti]

My 2015 hatchback displays a low tire pressure warning when a tire drops to 28 psi.

 

[Thesd45]

My 2014 LT hatch TPMS system also activates at about 28 psi. Although mine seems to do something no one else's Sonic does. In odometer display it will show which tire is low and the pressure its reading. Like "rr 27" and my right rear tire was at 27 psi, while the rest where still at 38 psi.

I'm assuming that for ease of programming the TPMS system GM must have chosen 28-29psi as the trip spot. As depending on the wheel option the car came with the factory recommended pressure can be 32-38 psi.

 

[Mad*Max]

My light has been on for a month and all the tires look okay, I will recheck the pressure, didn't realize that 28 psi would trigger the light!

 

[Mad*Max]

So it turns out my hand held gauge was defective so when I checked at the time the light had come on I incorrectly thought that the pressure was all right and that the TPMS is defective. I topped up the air and the light has now come off, thank goodness for this Forum!

 

[Natesriv]

So it turns out my hand held gauge was defective so when I checked at the time the light had come on I incorrectly thought that the pressure was all right and that the TPMS is defective. I topped up the air and the light has now come off, thank goodness for this Forum!

Totally !!