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B3420 Code – Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal

What are the Possible Causes of the Code B3420?
  • Faulty Headlamp Leveling Control Module Rear Axle Sensor
  • Headlamp Leveling Control Module Rear Axle Sensor harness is open or shorted
  • Headlamp Leveling Control Module Rear Axle Sensor circuit poor electrical connection
  • Faulty Headlamp Leveling Control Module
  • Need help with this OBD II code? Our mechanics are available within west Michigan to help. Outside of our service area? Visit our Car Help Section where you can ask questions and get answers.

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