C0077

C0077- LOW TIRE PRESSURE

- When Monitored:
Continuously.
- Set Condition:
A low pressure condition will exist when the tire pressure falls below or is equal to the low pressure threshold value as specified for the vehicle.

Possible Causes
INTERMITTENT PERFORMANCE DTC
INCORRECT TIRE PRESSURE
TIRE PRESSURE SENSOR
WCM (SKREEM)

Diagnostic Test
1. DTC STATUS IS ACTIVE

NOTE: If the incorrect Placard Values were programmed into the WCM/SKREEM, a DTC could be set. Before continuing with any TPM diagnostic test, using the scan tool, check that the correct Placard Values have been programmed in to the module.

NOTE: If the following conditions are present:
- Low Tire Pressure DTC (Stored)
- Tire Pressure Sensor Internal DTC (Active)
- Spare Tire is not equipped with a Tire Pressure Sensor
- Spare Tire is currently on the vehicle
Repair the tire and place it back on the vehicle. Test drive the vehicle.
If the DTC(s) reset continue with the diagnostic procedure.

Turn the ignition on. With the scan tool, select View DTCs in the Wireless Control Module (SKREEM).
Is the DTC status Active at this time?
Yes >> Go to 2
No >> Go to 4

2. LOW TIRE PRESSURE

NOTE: The DTC can be caused by many different factors and might not be a sensor/transmitter or a WCM (SKREEM) fault. Interference from other elements will over power the sensor/transmitter RF frequency making erratic operation to the TPM system. Check the vehicle for aftermarket accessories that could compromise the RF frequency signal before diagnosing the TPM system.

Correct all tire pressure to the recommended specifications and wait 2 minutes.
With the scan tool, clear DTCs in the Wireless Control Module (SKREEM).
Test Drive the vehicle for a minimum of 10 minutes with vehicle speed greater than 15 mph.
With the scan tool, select View DTCs in the Wireless Control Module (SKREEM).
Does the DTC reset or is the status Active for this DTC?
Yes >> Go to 3
No >> Test Complete.

3. TIRE PRESSURE SENSOR

NOTE: Before continuing, ensure the tire is free from any leaks or damage that would cause a low tire pressure condition. If a problem is found, repair as necessary and retest.

Turn the ignition off.
Replace the Tire Pressure Sensor.
With the scan tool, clear DTCs in the Wireless Control Module (SKREEM).
Test Drive the vehicle for a minimum of 10 minutes with vehicle speed greater than 15 mph. With the scan tool, select View DTCs in the Wireless Control Module (SKREEM).
Does the DTC reset or is the status Active for this DTC?
Yes >> Replace the Wireless Control Module (SKREEM).
No >> Test Complete.

4. INTERMITTENT TIRE PRESSURE SENSOR DTC
The conditions necessary to set this DTC are not present at this time.
Refer to any Technical Service Bulletins that may apply to this condition.
With the scan tool, clear DTCs in the Wireless Control Module (SKREEM).
Test Drive the vehicle for a minimum of 10 minutes with vehicle speed greater than 15 mph. With the scan tool, select View DTCs in the Wireless Control Module (SKREEM).
Does the DTC reset or is the status Active for this DTC?
Yes >> Repair as necessary
No >> Test complete.