OBD Guide
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B2645

Ambient Light Sensor Circuit

B2645 is an OBD-II diagnostic trouble code meaning: Ambient Light Sensor Circuit. Common causes: ambient light sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $22–111.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Incorrect operation of automatic headlights
  • Dashboard brightness adjustment malfunction
  • Check Engine Light or Dashboard Warning Light Is On

Causes

  • Ambient light sensor malfunction
  • Open or short circuit in wiring harness
  • Poor contact in connectors
  • Body Control Module (BCM) Software Failure

How to Fix

  1. Check the integrity of the ambient light sensor
  2. Inspect the wiring harness for damage
  3. Check connections and connectors
  4. Scan the body control module (BCM) for errors
  5. If necessary, replace the sensor or repair the wiring harness

Related codes

B2646B2647U1000

FAQ

What does the B2645 code mean?

B2645 is an OBD-II diagnostic trouble code that indicates: Ambient Light Sensor Circuit

What causes a B2645 error code?

The most common causes of B2645 include: Ambient light sensor malfunction; Open or short circuit in wiring harness; Poor contact in connectors; Body Control Module (BCM) Software Failure.

How do I fix a B2645 diagnostic trouble code?

To fix B2645: Check the integrity of the ambient light sensor. Inspect the wiring harness for damage. Check connections and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2645?

Limited driving only, diagnose soon

How much does it cost to fix B2645?

The estimated repair cost for B2645 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat