I SWAPPED WHEELS,COMPLETE WITH TIRES AND TPMS FROM A 2008 Z51 ONTO A 2008 STOCK VERT. I thought i had to reset the tpms but my dic is giving readouts, 30psi,29psi,30psi,30psi, do you think this is correct or is it from the old tpms? i drove the car 5 miles still reading the same, I've read on the forum that the dic would not read the new TPMS. I did order the tpms tool, to do the reset, but it hasn't arrived yet. Should the DIC give me another message when i change the tpms?

 

4 sensor ID#'s can be stored in the TPMS memory. If you haven't done a relearn procedure yet then the 4 ID#'s in your TPMS are the old sensors. Those number stay in there until you do a relearn procedure and then the old ones are erased and the new ID#'s are logged in and take their place. You can turn off the car, unhook the battery, let it sit for a year, but when you hook the battery up again those sensor ID#'s are still in the TPMS memory.

However, the pressures sent to the tpms are volatile. The car will remember the last known pressures from the last time you drove the car, and when you start it up the next time it shows those pressures until they are updated by new transmissions from the sensor. If you unhook the battery those last known pressures will be dropped out of memory and the DIC will display "xx psi" for all tires. The next time you drive the car it will take a couple minutes of driving faster than 20 mph for the sensors to wake up and send the current pressures to your TPMS to display in the DIC. Of course if you don't have sensors then the display will remain "xx psi" for all tires.

So, try unhooking the battery, and when you hook it back up and go driving you'll see "xx psi" for all tires and probably a "Service Tire Monitor" message.

If you don't unhook the battery and don't do a relearn, take the car for a drive of over approximately 1 hour (straight driving without shutting off the ignition) and you'll get a "Service Tire Monitor" message because the TPMS has not received any transmissions from the sensors.

So....the numbers you see are old numbers.

When you get your tool and do the relearn procedure you'll see the actual pressures in your tires.

Bob

 

Bob knows his TPMS....listen to the man

 

Thanks bob, thats what i thought was going on. Like i said i am waiting for my tool, in the meantime i check my pressures each time i go for a ride.

 

I am experiencing a similar TPMS problem. But my car is brand new with the original wheels/tires on it.

I just bought a new coupe. It had 7 miles on it. When driving home from the dealership (a 2-hour trip), the "Service Tire Monitor" warning light came on the dash after about 5 minutes of driving...and it stayed on the entire time. I checked, and all 4 tires are reading "xx psi" in the DIC. How is this possible for a new car? Will I need to buy the tool and do the relearn procedure?

 

Find a chevy dealer closer to you. unless you just want to buy a tool.

You're covered under your warranty

 

I responded in that other thread, but the only way that would happen is if the dealer swapped wheels.

Did you order the car? What wheels are on it? What is the wheel RPO code on the glove compartment door, or your window sticker?

If your car was sitting on the lot along with other cars, and somebody wanted another car that didn't have the wheels he wanted, they may have swapped them from your car to the other car.

If they charged you and you paid for wheels that you didn't get, it's time to jack up the dealer. Unless.....maybe you got an upgraded set of wheels without paying for them!

That's the only way that your sensors would not be properly programmed to your TPMS that I can think of. I'm positive that they didn't skip doing it on the production line.

Bob