OBD Guide
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B126A

Drivers Door Interior Lock Switch General Electrical Failure

B126A is an OBD-II diagnostic trouble code meaning: Drivers Door Interior Lock Switch General Electrical Failure. Common causes: open or short circuit in wiring harness, malfunction of internal door lock switch. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Inability to lock or unlock doors from interior switch
  • Door lights flashing
  • Central locking malfunction

Causes

  • Open or short circuit in wiring harness
  • Malfunction of internal door lock switch
  • Problems with the control module
  • Contact corrosion

How to Fix

  1. Check wiring harness for damage
  2. Check if the door lock switch is working properly
  3. Check control module
  4. Clean or replace corroded contacts

Related codes

B126BB126CB126D

FAQ

What does the B126A code mean?

B126A is an OBD-II diagnostic trouble code that indicates: Drivers Door Interior Lock Switch General Electrical Failure

What causes a B126A error code?

The most common causes of B126A include: Open or short circuit in wiring harness; Malfunction of internal door lock switch; Problems with the control module; Contact corrosion.

How do I fix a B126A diagnostic trouble code?

To fix B126A: Check wiring harness for damage. Check if the door lock switch is working properly. Check control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B126A?

Limited driving only, diagnose soon

How much does it cost to fix B126A?

The estimated repair cost for B126A is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat