OBD Guide
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B2659

Courtesy Switch Fault

B2659 is an OBD-II diagnostic trouble code meaning: Courtesy Switch Fault. Common causes: faulty interior light switch, wiring harness damage. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–56 (est.)

Symptoms

  • Faulty interior lighting
  • The backlight does not turn on when the doors are opened
  • False lighting alarms

Causes

  • Faulty interior light switch
  • Wiring harness damage
  • Oxidized switch contacts
  • Problems with the lighting control unit

How to Fix

  1. Check the interior light switch
  2. Inspect the wiring harness for damage
  3. Clean switch contacts
  4. Check the operation of the lighting control unit
  5. Replace the switch if necessary

Related codes

B2660B2661

FAQ

What does the B2659 code mean?

B2659 is an OBD-II diagnostic trouble code that indicates: Courtesy Switch Fault

What causes a B2659 error code?

The most common causes of B2659 include: Faulty interior light switch; Wiring harness damage; Oxidized switch contacts; Problems with the lighting control unit.

How do I fix a B2659 diagnostic trouble code?

To fix B2659: Check the interior light switch. Inspect the wiring harness for damage. Clean switch contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2659?

Do not drive — repair immediately

How much does it cost to fix B2659?

The estimated repair cost for B2659 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat