Buick Regal: Tire Pressure Rolling Count Procedure

Introduction

The Tire Pressure Rolling Count parameter for each sensor can be used to help confirm if the sensor transmissions are being received. As the vehicle is being driven, the Tire Pressure Rolling Count increments with every received TPM sensor transmission. If a suspected Sensor is not incrementing, incrementing very slowly compared to others or not at all, that could be a result of interference from aftermarket devices. The sensor transmission success rate (the rate at which each sensors transmission is being received by the RCDLR) can be verified in the scan tool.

NOTE: Scan tool procedure will be used if Tire Pressure Sensor exhibits "no Signal or poor intermittent signal reception" Before proceeding, check for the following:

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• A sensor does not transmit or transmits invalid data to the RCDLR.
• A sensor might exhibit low battery condition.
• If equipped, the driver information center displays " dashes" for the suspected sensor.
• Aftermarket wheel valve system 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
• Occasionally sensor transmissions are not received by the RCDLR due to vehicle level radio frequency interference from items such as but not limited to aftermarket ignition systems, DVD players, CB radios, or metallic type window tinting

How to determine if Sensor Signal is poor or has no signal

Use Scan Tool and follow on screen instructions:

1. Select Module Diagnosis
2. Select Body Control Module
3. Select Configuration/Reset Functions
4. Select Tire Pressure Sensor Signal Reset
5. The Tire Pressure Sensor Rolling Count parameters will be displayed

If the Tire Pressure Sensor Rolling Count parameter is below 50% on one or more tires

NOTE: When moving the tire pressure sensor to a different location on the vehicle, keep the tire pressure sensor with the original tire it is installed in.

• Move the appropriate tire to a different location on the vehicle and verify the Tire Pressure Sensor Rolling Count has increased. Refer to Tire and Wheel Removal and Installation.
• If Tire Pressure Sensor Rolling Count parameter does not increase after moving tire to different location, replace the appropriate B2 Tire Pressure Sensor and perform the Tire Pressure Indicator Sensor Learn.
• If Tire Pressure Sensor Rolling Count parameter does increase after moving tire to different location, check for any aftermarket devices that could be causing interference to the tire pressure sensor signal. Unplug the device and re-run test.

If the Tire Pressure Sensor Rolling Count parameter is above 50% on one or more tires (Follow normal TPM troubleshooting in Service information)

1. Verify if all 4 tire monitor pressure sensor DTCs are not set.

2. If 2 or more tire monitor pressure sensor DTCs are set, test the keyless entry antenna for proper operation, or if antenna is properly seated. Refer to Keyless Entry System Malfunction (Active) Keyless Entry System Malfunction (Passive).

3. Perform the Tire Pressure Indicator Sensor Learn.

4. Verify the scan tool Tire Pressure Sensor Mode parameters change to Drive while driving the vehicle above 40 km/h (25 mph) for greater than 2 min.

5. If a Tire Pressure Sensor Mode parameter does not change to Drive.

6. Replace the appropriate B2 Tire Pressure Sensor.

7. Perform the Tire Pressure Indicator Sensor Learn.

8. If the Tire Pressure Sensor Mode parameter changes to Drive.

9. All OK.

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