GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2007 🢒 H3 🢒 Brakes 🢒 Park Brake 🢒 DTC C0750, C0755, C0760, or C0765

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0750: Left Front Low Tire Pressure Sensor

DTC C0755: Right Front Low Tire Pressure Sensor

DTC C0760: Left Rear Low Tire Pressure Sensor

DTC C0765: Right Rear Low Tire Pressure Sensor

Circuit/System Description

The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor inside each wheel/tire assembly. As vehicle speed increases, centrifugal force closes the sensors internal roll switch and the sensors enter into drive mode. The body control module (BCM) receives and translates the data contained in each sensors RF transmission into sensor presence, sensor mode, and tire pressure. Once vehicle speed is 40 km/h (25 mph) or greater, the BCM waits for the first sensor to go into drive mode and then checks if all sensors have gone into drive mode.

Conditions for Running the DTC

Vehicle speed is 25 mph or greater for 2 minutes.

Conditions for Setting the DTC
    • Any given sensor does not go into drive mode.
    • Any given sensor does not transmit for 5 minutes.

Action Taken When the DTC Sets
    • The driver information center (DIC) displays the suspect tire pressure as dashes.
    • The DIC displays the SERVICE TIRE MONITOR warring message.

Conditions for Clearing the DTC
    • A current DTC will clear when the malfunction is no longer present.
    • The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
    • The DTC is cleared with a scan tool.

Diagnostic Aids
    • Some aftermarket wheel valve stem holes are located further from the wheel rim than original equipment wheels. When using the TPM diagnostic tool to activate a sensor, ensure the tools antenna is no further than 15 cm (6 in) from the sensor.
    • The sensor activation procedure may have to be repeated up to 3 times before determining a sensor is malfunctioning.
    • Occasionally sensors can become miss-located due to previous tire rotations where the sensor learn procedure was not performed. Always learn the sensors to ensure the DTC set is for that actual physical corner of the vehicle. Refer to Tire Pressure Sensor Learn .
    • Occasionally sensor transmissions are not received by the BCM due to vehicle level RF interference.

Reference Information

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Special Tools

J-46079 Tire Pressure Monitor Diagnostic Tool

Circuit/System Verification

Test drive the vehicle at a speed of 25 mph or greater for 2 minutes. No tire pressure monitor DTCs should set.

Circuit/System Testing

Important:  Tire pressure sensors should transmit valid data with good signal strength in response to low frequency activation from the TPM diagnostic tool. It is important to observe the signal strength graph on the TPM tools display screen after the activate button has been pressed and released. Any more than 1/4 graph displayed can be considered good signal strength.

  1. Using the special tool, activate each tire pressure sensor and record each sensors transmission data and physical location.
    2. ⇒Replace the suspect tire pressure sensor if the special tool does not display a 8-digit ID number, accurate tire pressure +/- 2 psi, Learn Mode and Good Signal Strength. Refer to the Tire Pressure Replacement.
  2. With the scan tool, observe the tire pressure sensor locations and ID.
    3. ⇒Learn the tire pressure sensors if the IDs and locations displayed on the scan tool do not match the IDs and locations recorded from the special tool.
  3. Enable the TPM learn mode. Use the TPM diagnostic tool in simulate mode to learn 4 simulated sensor transmissions into the BCM.
    4. ⇒If the scan tool does not display all 4 sensor locations, IDs and tire pressures as they are displayed on the TPM tools screen (+/-2 psi), replace the BCM.
  4. Test drive the vehicle above 40 km/h (25 mph) for greater than 10 seconds. With the scan tool observe the suspect Pressure Sensor Mode data parameter.
    5. ⇒If the suspect Pressure Sensor Mode does not change from Wake to Drive, replace the suspect tire pressure sensor.
    ⇒If no fault is found, go to Diagnostic Aids.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming