Tpsm

[WoodyLongbranch]

Left Front does not read at all.

Do you know where abouts the pickup is that detects the radio frequency for the tire pressure monitor system the left front wheel does not acknowledge any pressure it doesn't matter which Tire I put on there it's not the thing in the tire it's the left front pickup that sends the signal what should I be looking for do you have any idea

[Transient]

Did you attempt to adjust air pressure? Could be a simple momentary loss of signal.  Getting the pressure to change in the tire could force the sensor to send a signal to the computer.  If that doesn't work then maybe the battery in the sensor died and the sensor needs to be replaced. 

 

[WoodyLongbranch]

I've gone through multiple tests by adding air pressure reducing air pressure following the instructions for relearning the air pressure following the instructions and I've changed tires therefore I've changed sensors the senses work it only fails to read left front whatever the device is that reads the left front .

My question is what is the device that picks up the signal? Are there four separate antennas one for each tire?

That's what I'm trying to determine.

The problem is not the sensor in the tire but the actual device that the sensor transmits the signal to.

That's the question

That's what I'm looking to figure out.

[Bikerjon]

Your profile says 2009 Sierra. What vehicle are you trying to troubleshoot?