Pinpoint Test J: DTC B2872

Tire Pressure Monitoring System

Pinpoint Test J: DTC B2872

Normal Operation

If there is a concern with 1, 2 or 3 TPMS sensors, the TPMS sets DTC B2872. The TPMS indicator flashes for 70 seconds from key ON and then remains ON continuously. This symptom occurs when the Tire Pressure Monitor (TPM)/Vehicle Security Module (VSM) does not hear from a sensor or is incapable of hearing a sensor(s) for 20 minutes.

- DTC B2872 (Tire Pressure Sensor Fault) - sets if the TPMS has been unable to communicate with 1 or more sensors (up to 3) for more than 20 minutes.

This pinpoint test is intended to diagnose the following:

- TPMS sensors not trained to the TPMS
- TPMS sensors not transmitting / damaged
- TPMS sensors missing
- Incorrect TPMS sensor installed
- Spare tire in use
- Radio Frequency Interference (RFI)

PINPOINT TEST J: DTC B2872

NOTE: If the vehicle has been stationary for more than 30 minutes, the sensors go into "sleep mode" to conserve battery power. It becomes necessary to wake them up so that they transmit the latest tire pressure information to the TPM/VSM. Refer to Tire Pressure Monitoring System (TPMS) Sensor Activation Tire Pressure Monitoring System (TPMS) Sensor Activation.

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J1 CHECK TPMS SENSOR IDENTIFIERS AND FOR SPARE TIRE USE

NOTE: Make sure that all aftermarket electronic equipment has been disconnected (if possible) and that the customer has been questioned about the kinds of electronic equipment they may have been using in the vehicle when this issue was identified.

- Connect the scan tool.
- NOTE: A spare tire cannot be programmed to the vehicle, even if equipped with a TPMS sensor. If a damaged road wheel is located in the trunk and the TPM/VSM cannot communicate with it, or if the damaged wheel has been dropped off at a dealership or repair shop, the TPM/VSM sets a TPMS sensor fault.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: VSM DataLogger.
- Read and record the following PIDs:

- Left Front Tire Transmitter Identifier (LF_ID)
- Right Front Tire Transmitter Identifier (RF_ID)
- Left Rear Tire Transmitter Identifier (LR_ID)
- Right Rear Tire Transmitter Identifier (RR_ID)
- Is the spare tire in use?

Yes
REPAIR and REMOUNT the wheel to the vehicle. REFER to Wheel and Tire Overhaul. ADJUST the tire pressure to the required pressure as specified on the Vehicle Certification (VC) label located in the driver door jam.

No
GO to J2.

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J2 CARRY OUT TPMS SENSOR TRAINING

- Training the TPMS sensors. Refer to Tire Pressure Monitoring System (TPMS) Sensor Training Tire Pressure Monitoring System (TPMS) Sensor Training.
- Did all the sensors train?

Yes
GO to J3.

No
GO to J4.

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J3 COMPARE THE SENSOR IDENTIFIERS BEFORE AND AFTER SENSOR TRAINING

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: VSM DataLogger.
- Read and record the following PIDs:

- Left Front Tire Transmitter Identifier (LF_ID)
- Right Front Tire Transmitter Identifier (RF_ID)
- Left Rear Tire Transmitter Identifier (LR_ID)
- Right Rear Tire Transmitter Identifier (RR_ID)
- Compare the recorded transmitter identifier PID readings taken before sensor training with the readings taken after sensor training.
- Did all the sensors match?

Yes
Sensor identifiers that did not match were mounted to the vehicle without the required sensor training. Sensor training in the previous step has corrected the condition.

No
REFER to Tire Pressure Monitoring System (TPMS) PID Definitions for more information on repairing intermittent conditions .

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J4 SENSOR(S) NOT RESPONDING TO TRAINING

- NOTE: Sensor(s) that fail to train may be broken, missing, effected by RFI or the wrong sensor(s) may be installed.
- Dismount tire and inspect the suspect TPMS sensor(s).
- Install a new sensor(s) as necessary. Refer to Tire Pressure Monitoring System (TPMS) Sensor Service and Repair.
- Retrain the TPMS sensors. Refer to Tire Pressure Monitoring System (TPMS) Sensor Training Tire Pressure Monitoring System (TPMS) Sensor Training.
- Did all the tire pressure sensors transmit to the TPM/VSM?

Yes
The system is functioning normally.

No
REFER to Tire Pressure Monitoring System (TPMS) principles of operation for additional information on training sensors.

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