OBD Guide
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B17F3

Auto High Beam System Aim

B17F3 is an OBD-II diagnostic trouble code meaning: Auto High Beam System Aim. Common causes: malfunction of light sensors, wiring harness problems. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Automatic high beam does not work
  • The system does not switch between low and high beams
  • Dashboard warning light
  • Reduced lighting efficiency at night

Causes

  • Malfunction of light sensors
  • Wiring Harness Problems
  • Error in the headlight aiming mechanism
  • Camera malfunction (if used)
  • Control unit software error

How to Fix

  1. Check light sensors for dirt or damage
  2. Check the wiring harness for breaks or short circuits
  3. Test the headlight aiming mechanism
  4. Update control unit software
  5. Replace faulty components

FAQ

What does the B17F3 code mean?

B17F3 is an OBD-II diagnostic trouble code that indicates: Auto High Beam System Aim

What causes a B17F3 error code?

The most common causes of B17F3 include: Malfunction of light sensors; Wiring Harness Problems; Error in the headlight aiming mechanism; Camera malfunction (if used).

How do I fix a B17F3 diagnostic trouble code?

To fix B17F3: Check light sensors for dirt or damage. Check the wiring harness for breaks or short circuits. Test the headlight aiming mechanism. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B17F3?

Yes, but get it checked soon

How much does it cost to fix B17F3?

The estimated repair cost for B17F3 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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