OBD Guide
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B2639

Driver DEF Door Fail

B2639 is an OBD-II diagnostic trouble code meaning: Driver DEF Door Fail. Common causes: open or short circuit in wiring, door control unit malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Door locks don't work
  • Window lifter doesn't work
  • Dashboard warning

Causes

  • Open or short circuit in wiring
  • Door control unit malfunction
  • Contact corrosion
  • Door sensor malfunction

How to Fix

  1. Check door wiring harness
  2. Check contacts for corrosion
  3. Check the door control unit
  4. Replace faulty components

Related codes

B2640B2641

FAQ

What does the B2639 code mean?

B2639 is an OBD-II diagnostic trouble code that indicates: Driver DEF Door Fail

What causes a B2639 error code?

The most common causes of B2639 include: Open or short circuit in wiring; Door control unit malfunction; Contact corrosion; Door sensor malfunction.

How do I fix a B2639 diagnostic trouble code?

To fix B2639: Check door wiring harness. Check contacts for corrosion. Check the door control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2639?

Limited driving only, diagnose soon

How much does it cost to fix B2639?

The estimated repair cost for B2639 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat