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Pinpoint Test B: B124D:02

WARNING: This page is about a different car, the 2022 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. Normal Operation and Fault Conditions 

    REFER to: Tire Pressure Monitoring System (TPMS) - System Operation and Component Description .

    Communication between the RTM and the TPMS sensors can be interrupted by RFI, which causes intermittent issues that are not vehicle concerns. RFI is generated by electrical motors and appliance operation, cellular telephones, remote transmitters, power inverters and portable entertainment equipment.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    BCM B124D:02 Tire Pressure Sensor: General Signal Failure Set by the BCM in continuous memory when 1, 2 or 3 of the tire pressure sensors are faulted, not communicating with the RTM or when sensor data is not received by the BCM from the RTM.

    Possible Sources 

    • RFI
    • One or more TPMS sensors not trained
    • TPMS sensor(s)

    Visual Inspection and Pre-checks 

    • Inspect for customer electronic devices, such as cell phone chargers or GPS units.
    • Inspect for Non-Original Equipment Manufacturer (OEM) wheels or run-flat tires.
    • Verify horn operation.
    • Verify spare tire is not in use.

  2. B1 CHECK THE BCM (BODY CONTROL MODULE) TPMS (TIRE PRESSURE MONITORING SYSTEM) STATUS (TPMS_STATUS) PID (PARAMETER IDENTIFICATION) AND SENSOR IDENTIFIERS

    • Ignition ON.

    • Using a diagnostic scan tool, view and record  the following BCM Parameter Identifications (PIDs):

      • Left Front Tire Transmitter Identifier (TPM_S_ID_LF)
      • Right Front Tire Transmitter Identifier (TPM_S_ID_RF)
      • Left Rear Tire Transmitter Identifier (TPM_S_ID_LRO)
      • Right Rear Tire Transmitter Identifier (TPM_S_ID_RRO)

    • View the BCM TPMS_STATUS PID.

    Does the BCM TPMS_STATUS PID display SENSOR FAULT? 

    Yes  GO to B2 
    No  If the TPMS_STATUS PID displays SYSTEM FAULT, GO to Pinpoint Test A 

  3. B2 CARRY OUT THE TPMS (TIRE PRESSURE MONITORING SYSTEM) SENSOR TRAINING PROCEDURE

    Did all of the TPMS sensors train and did the horn sound when each sensor was trained? 

    Yes  Using a diagnostic scan tool, LOCATE the updated TPMS sensor identifiers trained to the BCM. COMPARE these values to those recorded prior to the TPMS sensor training procedure. Disregarding sensor position, any sensor identifiers not matching those retrieved from the module were changed, but not retrained. The sensors are now trained to the vehicle, diagnosis is complete. DOCUMENT all TPMS sensor identifiers on the applicable warranty claim.
    No  GO to B3 

  4. B3 ATTEMPT TO TRAIN THE TPMS (TIRE PRESSURE MONITORING SYSTEM) SENSORS AGAIN

    Did any of the TPMS sensors train and did the horn sound when each sensor was trained? 

    Yes  If only some of the sensors trained, VERIFY the correct sensors are installed. If the correct sensors are installed and do not train, INSTALL a new TPMS sensor for each sensor that failed to train. REFER to: Tire Pressure Monitoring System (TPMS) Sensor . If all the sensors trained, the concern may have been caused by RFI. For information on locating sources of RFI, REFER to: Tire Pressure Monitoring System (TPMS) - System Operation and Component Description .
    No  GO to B4 

  5. B4 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all BCM connectors.

    • Repair:

      • corrosion (replace connector or terminals - clean module pins)
      • damaged or bent pins - replace terminals or pins
      • pushed-out pins - replace pins as necessary

    • Connect the BCM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  The sensors may not be present. DISMOUNT the tires and VERIFY the correct sensors are present and mounted to the wheels. If the sensors are missing, INSTALL new sensors. REFER to: Tire Pressure Monitoring System (TPMS) Sensor . CLEAR the Diagnostic Trouble Codes (DTCs). If all the sensors are present and of the correct type, CHECK OASIS for any applicable Technical Service Bulletins (TSBs), GSB, SSM or FSA. If a exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no TSB exists for the concern, INSTALL a new BCM. REFER to: Body Control Module (BCM) . .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. CLEAR the Diagnostic Trouble Codes (DTCs).
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