GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saab 🢒 2006 🢒 9-7x 🢒 Restraints 🢒 SIR 🢒 DTC C0750, C0755, C0760, or C0765

Circuit Description

The tire pressure monitor (TPM) system has 4 radio frequency (RF) transmitting pressure sensors inside each wheel/tire assembly. As vehicle speed increases to at least 32 km/h (20 mph) the sensor's internal roll switch closes which puts the sensors into drive mode. The sensors begin to transmit once every 60 seconds to the liftgate module (LGM). The data within the sensors RF transmission is translated by the LGM into sensor presence, sensor mode, and tire pressure. If a sensor did not go into drive mode, or is not transmitting at all, LGM will set the appropriate DTC.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • 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

Conditions for Running the DTC

Vehicle speed is 40 km/h (25 mph), or greater for 2 minutes.

Conditions for Setting the DTC

Any given sensor stops transmitting for 5 minutes.

Action Taken When the DTC Sets
    • A DTC is stored in memory.
    • The driver information center (DIC) displays the SERVICE TIRE MONITOR warning message.

Conditions for Clearing the DTC
    • A current DTC will clear when the malfunction is no longer present.
    • A history DTC will clear after 100 consecutive malfunction-free ignition cycles.
    • Using a scan tool

Diagnostic Aids
    • Occasionally sensors can become mislocated 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 LGM due to vehicle level RF interference.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests if the sensors internal battery level is low.

    2.

  2. This step tests if the malfunction was system, or vehicle condition related.

    3.

  3. This step tests if the sensors internal roll switch is functioning properly.

    4.

  4. This step tests if the malfunction was corrected by sensor replacement of if the malfunction still exists in the LGM.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Suspect Pressure Sensor Mode Data parameter in Data Display.

Does the scan tool indicate that the suspect Pressure Sensor Mode is Low Bat?

Go to Step 6

Go to Step 3

3

Since some occurrences of this DTC are caused by certain vehicle conditions, review the tire pressure monitor (TPM) system with the customer to verify the conditions under which the DTC set.

Did vehicle conditions cause this DTC to set?

Go to Diagnostic Aids

Go to Step 4

4

Learn the tire pressure sensors. Refer to Tire Pressure Sensor Learn .

Did a horn chirp sound when learning the suspect sensor?

Go to Step 5

Go to Step 6

5

  1. Test drive the vehicle above 32 km/h (20 mph) for 10 seconds.
  2. With the scan tool, observe the Suspect Pressure Sensor Mode Data parameter.

Does the Suspect Pressure Sensor Mode data parameter change from Wake to Drive above 32 km/h (20 mph)?

System OK

Go to Step 6

6

Replace the suspect tire pressure sensor. Refer to Tire Pressure Indicator Sensor Replacement .

Did a horn chirp sound when learning the suspect sensor?

Go to Step 8

Go to Step 7

7

Replace the liftgate module (LGM)/switch assembly. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 8

--

8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

Go to Step 2

System OK