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2014 RAM 2500
6.7L I6 Cummins Diesel•4WD•AUTOMATIC•diesel•turbo
16 active safety recalls on this vehicle — view recalls🏆Sponsored by Lost Pines Precision Automotive· Bastrop, TX
Repairs436Labor519Torque3583Fluid10DTC1037Battery1Maintenance0Recalls16
B2100low severityBody

Automatic Headlight Sensor Circuit

on 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD

What this code means

Malfunction in the automatic headlight ambient light sensor circuit.

Symptoms

  • Auto headlights not turning on in tunnels/darkness
  • Headlights on in bright daylight
  • Auto headlight feature disabled
  • Dash light sensor not adjusting brightness

Common causes

  • Faulty ambient light sensor
  • Sensor covered by dashboard object
  • Wiring damage
  • BCM auto-light module fault
  • Sensor window dirty

Diagnostic steps

  1. Check light sensor reading with scan tool
  2. Clean sensor lens on dashboard
  3. Inspect sensor wiring
  4. Test BCM auto headlight output
  5. Verify feature is enabled in settings

Repair notes

Replace ambient light sensor or clean sensor window. Check that nothing is covering the sensor on the dash top.

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