I recently purchased a 2002 Monte Carlo SS Pace Car version. The lot balanced the front tires, then about 2 days later the low pressure light came on. I took and back and had it reset, but now about 2 weeks later the light is back on again. Is this normal or is it a bad sensor? Also I read a reply to a similar question on this site and the reply was to "reset the dash switch" to turn off the light........how do you reset the dash switch?
on my '05 Impala there are no pressure sensors, they are reading the speeds of the wheels through the ABS computer and throwing a light if there is a mismatch. Is it possible that you have one new tire and one worn tire?
good luck
nate
Can I assume you've actually checked the pressure? If it is down about 3 to
5 psi compared to the tire on the other side, the light will come on.On my care, it does not read pressure, but the computer counts the wheel revolutions and compares them. The low tire will turn more revolutions than the higher pressure tire and give the signal. Assuming the pressure is OK, on my car (leSabre), you just hold in the reset button for about 5 seconds and it will rest itself. Yours may be different.
Are the tires the same brand, size and equally worn? If not, from what the other guys said, this could cause the problem.
Document ID# 751368
2002 Chevrolet Monte Carlo-------------------------------------------------------------------------------- Tire Pressure Monitor Description and Operation 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. The software requires approximately 30 minutes of straight line driving in each of the three different speed ranges to complete the calibration process in order to have full capability of detecting a tire pressure condition. The speed ranges are as follows:
24-64 km/h (15-40 mph) 64-113 km/h (40-70 mph) 113-145 km/h (70-90 mph) Each speed range has 2 modes of tire pressure detection:Monitor Mode 1 Monitor Mode 2 The EBCM learns the tire pressure calibration for each speed range independently. In Monitor Mode 1, the EBCM has only partially learned the tire pressure calibration for the speed range and has limited detection capability for a tire pressure conditions. In Monitor Mode 2, the EBCM has fully learned the tire pressure calibration for the speed range and has full detection capability for a tire pressure condition. Once the TPM system is calibrated the EBCM monitors the ABS wheel speed sensor inputs, which will all be the same as the learned calibration if the tire pressures stay the same. If the pressure increases or decreases in a tire, so too will that tires circumference and radius, which causes that wheel speed sensor input to change. The EBCM recognizes this change in wheel speed as a tire pressure condition. If the pressure in one tire becomes at least 69 kPa (10 psi) higher or lower than the other three the EBCM commands the IPC message center to display the LOW TIRE PRESSURE warning message via a class 2 serial data circuit. This warning message is a re-configurable telltale and is ranked as lowest priority and may not be displayed if a higher priority message is requested at the same time. This message does not appear if more than one tire has high or low pressure, or if the system is not calibrated properly. The TPM system does not alert the driver to which tire is high or low. To turn off the LOW TIRE PRESSURE warning message, refer to Tire Pressure Monitor Reset Procedure .
Document ID# 679494
2002 Chevrolet Monte Carlo-------------------------------------------------------------------------------- Tire Pressure Monitor Reset Procedure
Important There are 3 different ways to reset the Tire Pressure Monitor (TPM) system. 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, for further information, refer to Tire Pressure Monitor Description and Operation . If the TPM system does not reset, or DTC C1245 remains current, refer to Diagnostic System Check - Tire Pressure Monitoring .
Using the exterior lamp switch Adjust all tire pressures to the recommended kPa/psi. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication, or to Tire Placard in General Information. Turn ON the ignition, with the engine OFF. Cycle the exterior lamp switch from OFF to parking lamps 3 times within 5 seconds. Use the scan tool in order to clear the TPM DTC. Using the RDS radio, if equipped Adjust all tire pressures to the recommended kPa/psi. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication, or to Tire Placard in General Information. Turn the ignition to ACC or ON, with the engine OFF. Turn the radio OFF. Press and hold the DISP button until SETTINGS is displayed. Press the SEEK up or down arrows until TIRE MON is displayed. Press the PREV or NEXT button to enter the submenu. RESET will be displayed. Press the DISP button, A chime will sound and DONE will be displayed. Scroll until EXIT is displayed. Press the DISP button to exit the TPM reset mode. A chime will sound to verify exit. Use the scan tool in order to clear the TPM DTC. Using the scan tool Adjust all tire pressures to the recommended kPa/psi. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication, or to Tire Placard in General Information. Install the scan tool. Turn ON the ignition, with the engine OFF. With the scan tool select Special Functions. Select TIM Reset. Press the Reset soft key. Use the scan tool in order to clear the TPM DTC.
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