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Discussion Starter #1
I live in Colorado, and we do get snow. In fact we had the first cold snap and a couple of inches of snow yesterday (10/14). The roads stayed clear, but a warning of what is to come.
I had gone to my tire store (discount tire) last week and ordered a set of winter tires on rims. They showed up today and were installed. The winter tires are not inflated as much as the summer tires, so my TPM is acting up and telling me that my tires are deflated. I read in another thread here that after, for example, a tire rotation, the TPM has to "relearn' and some procedure has to be followed. I couldn't find if this just is a procedure to tell the computer where the sensors are located, or if this will also adjust to the right pressure. The car does give me the pressure of the tires, so I think the sensors are working, but it also flags them as "too low". Is there a way to teach the system that the pressure is meant to be a few psi lower with the winter tires?
 

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You don't need to run the winters lower. Pump them up, warning will go away. Sounds like your tire store already matched the new sensors to the car.
 

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if your do it yourself -will need a re-learning tool - and the manual should have the steps.
 

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Ok, this is a bit weird. The TPM complained about the wrong pressure. I put some extra air in the tires, and they are now probably a bit overinflated at 40 psi, but nothing changed. The TPM still says the pressure is 30 psi. So, it seems that the sensors in the tires are not talking to the TPM, but why would it then report a pressure?

Is this a problem with the TPM or with the tire sensors?
 

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Ok, this is a bit weird. The TPM complained about the wrong pressure. I put some extra air in the tires, and they are now probably a bit overinflated at 40 psi, but nothing changed. The TPM still says the pressure is 30 psi. So, it seems that the sensors in the tires are not talking to the TPM, but why would it then report a pressure?

Is this a problem with the TPM or with the tire sensors?
A) It'll show the last read pressure until you drive a few miles. Gen 2 TPMS don't seem to wake up after just a pressure change like the Gen 1 do.
B) Did you set all four tires to the same pressure using a hand pressure gauge? I mean, you said "tires" but didn't specify and the monitoring doesn't intrinsically know which tire is on what hub until it's been relearned.
 

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A) It'll show the last read pressure until you drive a few miles. Gen 2 TPMS don't seem to wake up after just a pressure change like the Gen 1 do.
B) Did you set all four tires to the same pressure using a hand pressure gauge? I mean, you said "tires" but didn't specify and the monitoring doesn't intrinsically know which tire is on what hub until it's been relearned.
This. You need to drive a bit for the TPMS to see the new pressure. BTW, I keep mine at 41 PSI and top off when it hits 38-39psi.
 

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Yes, I set all 4 tires to the same pressure (about 41 psi). I did take the car back to the tire shop and they tried a few times to relearn, but did not get the response from the car (honk) when they were trying to reset the TPM. Nothing changed after driving for 20 minutes. They now think that the sensors are not compatible with the Volt system, and are getting some sensors from Chevy.

To be continued ...
 

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The better tools should be able to read a ID number - temp- pressure and voltage

The battery is small so by design it does not xmit all the time

Adding preasure on Gen one makes mine send data

I would guess that even a gen two will send if you LOWER pressure but the software may be set to moving and lower pressure to send ?
 
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