Diagnostic Instructions
DTC Descriptor
DTC C0774: Low Tire Pressure System Performance
Circuit Description
The tire pressure monitor (TPM) system has 4 radio frequency (RF) transmitting pressure sensors inside each wheel/tire assembly. If a sensor detects a low tire pressure, the DIC will display the CHECK TIRE PRESSURE, and the Electronic Brake Control
Module (EBCM) will receive a serial data message that a DTC C0774 has set. The Vehicle Stability Enhancement System (VSES) will compensate for the low tire pressure with a calibration change to low tire present. Review the TPM for diagnostics for C0774.
Conditions for Running the DTC
Vehicle speed is 32 km/h (20 mph), or greater for 1 minute.
Conditions for Setting the DTC
| • | The TPM detects a tire pressure difference in 1 tire of 8.2 kPa (1.2 psi) higher or lower than the other 3. |
| • | The EBCM will receive a serial data message that a DTC C0774 has set. |
Actions Taken When the DTC Sets
| • | A DTC C0774 is stored in memory. |
| • | The VSES system compensates for low tire pressure. |
Conditions for Clearing the DTC
| • | A current DTC will clear when the TPM system is reset. |
| • | A history DTC will clear after 100 consecutive malfunction-free ignition cycles from when the TPM system has been reset. |
Diagnostic Aids
A possible cause of this DTC could be a low tire pressure in one of the four tires.
Scan Tool Reference
Control Module References
for Scan Tool Information
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
