We just bought a 2003 Impala and put on 18 inch rims with 245/45/18 tires. It still rides smooth but now our "low tire pressure" warning light turns on and stays lit. What can I do?

We just bought a 2003 Impala and put on 18 inch rims with 245/45/18 tires. It still rides smooth but now our "low tire pressure" warning light turns on and stays lit. What can I do?


Turn ON the ignition, with the engine OFF.
Cycle the exterior lamp switch from OFF to parking lamps 3 times within 5 seconds
After resetting, the TPM system requires up to 30 minutes of straight line driving in each of the 3 speed ranges to complete the calibration process
24-64 km/h (15-40 mph)
64-113 km/h (40-70 mph)
113-145 km/h (70-90 mph)

Where are the pressure monitoring sensors located? I thought they were inside the tires attached to the wheels? If so don't they have to be relocated onto the new wheels?

Where are the pressure monitoring sensors located? I thought they were inside the tires attached to the wheels? If so don't they have to be relocated onto the new wheels?
The Tire Pressure Monitor (TPM) system alerts the driver when a large change in the pressure of one tire exists while the vehicle is being driven. The TPM system uses the Electronic Brake Control Module (EBCM), ABS wheel speed sensor inputs, class 2 serial data circuit, and the Instrument Panel Cluster (IPC) message center to perform the system functions. The EBCM contains the software to calculate relative tire pressure differences.

Good information... I still don't know where the sensors are that physically monitor the tire pressure... Aren't they located inside the wheels/tires?

no it uses the abs sensors which are located on the hub, it senses when one wheel is spinning fast/slower than the others and then throws the LTP code.

if you have the DISP button on your radio it can reset the message too.

Reset it using your "stock" radio. Turn car off, turn radio off, turn key to ACC. Push and hold the lower knob that says DISP for 10 seconds, your radio display should then say something like "settings" use the buttons directly below the power button to scroll through the menu, get to tire monitor(or similar) push the # 2 button till reset shows up then push the DISP button again. You can re program alarm functions , light functions, add fobs ect using the radio.