2010 Cadillac Truck SRX AWD V6-3.0L Page 865
DTC C0755 29
- Right Front Tire Pressure Sensor Too Few Pulses
DTC C0755 39
- Right Front Tire Pressure Sensor Internal Malfunction
DTC C0760 03
- Left Rear Tire Pressure Sensor Low Voltage
DTC C0760 29
- Left Rear Tire Pressure Sensor Too Few Pulses
DTC C0760 39
- Left Rear Tire Pressure Sensor Internal Malfunction
DTC C0765 03
- Right Rear Tire Pressure Sensor Low Voltage
DTC C0765 29
- Right Rear Tire Pressure Sensor Too Few Pulses
DTC C0765 39
- Right Rear Tire Pressure Sensor Internal Malfunction
Circuit/System Description
The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed
increases, centrifugal force closes the sensors internal roll switch, which puts the sensor into Rolling mode. The body control module (BCM)
receives and translates the data contained in the tire pressure sensor RF transmissions into sensor presence, sensor mode, and tire pressure. Once
vehicle speed is greater than 40km/h (25 mph), the BCM waits for the first sensor to go into Rolling mode, then checks if all sensors have gone into
Rolling mode. If one or more sensors do not go into these modes, or do not transmit at all, the BCM will set DTC C0750, C0755, C0760, or C0765
respectively.
Conditions for Running the DTC
Vehicle speed is greater than 40 km/h (25 mph).
Conditions for Setting the DTC
* A sensor does not transmit for 18 minutes.
* A sensor low battery condition.
Action Taken When the DTC Sets
* The tire pressure monitor indicator icon on the instrument panel cluster (IPC) flashes for 1 minute and then remains illuminated after the
ignition switch is cycled ON and the IPC bulb check is complete.
* If equipped, the driver information center (DIC) displays the suspect tire pressure as dashes.
* If equipped, the DIC displays a service tire monitor type message.
Conditions for Clearing the DTC
* A current DTC will clear when the malfunction is no longer present and 1 ignition cycle occurs.
* The BCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
* Some aftermarket wheel valve stem holes are located further from the wheel rim than original equipment wheels. When using the TPM
special tool to activate a sensor, ensure the tool antenna is no further than 15 cm (6 in) from the sensor and is aiming upward.
* Aftermarket wheel valve stem locations can cause a sensor to not function correctly.
* A sensor may have been damaged due to a previous wheel/tire service or flat tire event.
* The use of other than GM approved tire sealants can obstruct the sensor pressure sensing port and cause inaccurate tire pressure readings. If
this condition is verified, remove the sealer from the tire and replace the sensor. Refer to Tire Pressure Indicator Sensor Replacement (See:
Instrument Panel, Gauges and Warning Indicators/Tire Monitoring System/Tire Pressure Sensor/Service and Repair).
* Occasionally sensor transmissions are not received by the BCM due to vehicle level RF interference from items such as but not limited to
aftermarket ignition systems, DVD players, CB radios, or metallic type window tinting.
* The sensor activation procedure may have to be repeated up to 3 times before determining a sensor is malfunctioning. In the event a
particular sensor information is displayed on the special tool upon activation but the horn does not chirp, it may be necessary to rotate the
wheel valve stem to a different position due to the RF signal is being blocked by another component.
* Occasionally sensors can become mislocated due to previous tire rotations where the sensor learn procedure was not performed or stray
