Without RPO WC2 or WC8
DTC C0750, C0755, 00760, or 00765 (w/o WC2 or WC8)Circuit Description
The Tire Pressure Monitor (TPM) system has 9 radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed increases above 32 km/h (20 mph) the sensors internal roll switch closes which puts the sensors into drive mode. The sensors begin to transmit once every 60 seconds to the Remote Control Door Lock Receiver (RCDLR). The data within the sensors RF transmission is translated by the RCDLR into sensor presents, sensor mode and tire pressure. The RCDLR waits for the first sensor to go into drive mode then checks if all sensors have gone into drive mode.
Condition for Running the DTC
Vehicle speed is above 32 km/h (20 mph).
Conditions for Setting the DTC
Any given sensor does not go into drive mode, or does not transmit at all for 35 minutes.
Action Taken When the DTC Sets
^ A DTC is stored in memory.
^ The DIC displays the SERVICE TIRE MONITOR warning message.
^ The DIC will display the suspect tire pressure as dashes.
Conditions for Clearing the DTC
^ A current DTC will clear when the malfunction is no longer present.
^ A history DTC will clear after 50 consecutive malfunction free ignition cycles.
^ Using a scan tool.
Diagnostic Aids
^ If the vehicle is stationary for more than 15 minutes after being driven the sensors will go into stationary mode. Always test drive the vehicle over 32 km/h (20 mph) to insure the sensors are in drive mode before viewing tire pressures on the DIC.
^ If there is an open in the class 2 serial data circuit to the receiver, the DIC will display dashes for all tire pressures and the SERVICE TIRE MONITOR warning message.
^ Occasionally sensor transmission will not be received by the RCDLR due to vehicle level RF interference.
^ Loss of, or low vehicle battery voltage, or disconnecting the RCDLR will cause the sensors Id codes to be erased from the RCDLR's memory and set all 4 of the sensor DTCs. If this condition is suspected, refer to Tire Pressure Sensor Learn (w/o WC2 or WC8) or Tire Pressure Sensor Learn (w/ WC2 or WC8).
^ Occasionally sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed. Always learn the sensors first then test drive to ensure the DTC set is for that actual corner of the vehicle. Refer to Tire Pressure Sensor Learn (w/o WC2 or WC8) or Tire Pressure Sensor Learn (w/ WC2 or WC8).
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests if the malfunction is due to the sensors internal battery being low.
5. Tests if the sensors internal roll switch is functioning properly.
6. Tests if the malfunction was corrected by sensor replacement, or if the malfunction still exists in the RCDLR.
Test Procedure