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Possible Causes

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
  1. B1: CHECK FOR ABS MODULE DTCS 
    • Ignition ON, engine OFF.
      NOTE: To access the ABS ECU Reset routine when using Ford IDS, go to Chassis, then Braking and click ABS ECU Reset.
    • Using a diagnostic scan tool, carry out the ABS ECU Reset routine.

      Carry out the ABS self-test.

    • Is DTC C003x:01, C003x:11, C003x:12, C003x:14 or C1A95:01 present? 
      Yes No
      For DTC C0031:01, C0031:11, C0031:12, C0031:14, C0032:11, C0034:01, C0034:11, C0034:12, C0034:14, C0035:11 or C1A95:01, GO to PINPOINT TEST M .
      For DTC C0037:01, C0037:11, C0037:12, C0037:14, C0038:11, C003A:01, C003A:11, C003A:12, C003A:14 or C003B:11, GO to PINPOINT TEST N .      		 Go to  B2.
  2. B2: CHECK THE TIRES SIZE AND PRESSURE 
    • Ignition OFF.
    • Verify all the tires and wheels are the same size and the tire size and inflation pressures are correct as indicated on the VC label.
    • Are the tires and wheels OK? 
      Yes No
      Go to  B3. INSTALL the correct size tire or wheel or ADJUST tire pressure as necessary.
  3. B3: CHECK THE WHEEL SPEED SENSOR AND ELECTRICAL CONNECTOR 
    • With the transmission in NEUTRAL, position the vehicle on a hoist. Refer to the Jacking and Lifting article.
    • Disconnect the suspect wheel speed sensor electrical connector.
    • Using a good light source, inspect the wheel speed sensor and electrical connector for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
      • water intrusion - clean and dry the connector, install a new connector as necessary
    • Inspect the wheel speed sensor and harness for abrasions, broken connector tabs or water intrusion.
    • Are the wheel speed sensor and harness OK? 
      Yes No
      Go to  B4. INSTALL a new wheel speed sensor for the one in question. REFER to the appropriate procedure in the Anti-Lock Brake System (ABS) and Stability Control article.
  4. B4: INSPECT THE WHEEL SPEED SENSOR MOUNTING 
    • Inspect the suspect wheel speed sensor and fastener for looseness.
    • Inspect the suspect wheel speed sensor installation.
    • Is the wheel speed sensor installed correctly and is the wheel speed sensor fastener tight? 
      Yes No
      Go to  B5. REINSTALL or TIGHTEN the wheel speed sensor fastener to specification.
  5. B5: CHECK THE FRONT AND REAR ENCODERS FOR DAMAGE 
    NOTE: It may be necessary to remove the brake disc to thoroughly inspect the front wheel speed encoder.
    • Inspect the suspect front wheel bearing for abnormal wear or roughness and for deformation or contamination of the seal and encoder.
      NOTE: It may be necessary to remove the rear axle shaft to thoroughly inspect the rear wheel speed encoder.
    • Inspect the suspect rear wheel speed sensor encoder for signs of damage, deformation and missing teeth.
    • Are the wheel bearings and encoders OK? 
  6. B6: CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPEN 
    • Ignition OFF.
  7. B7: CHECK FOR RETURNING DTCS 
  8. B8: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
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