OBD Guide
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B2129

Central Lock Feedback Failure

B2129 is an OBD-II diagnostic trouble code meaning: Central Lock Feedback Failure. Common causes: open feedback circuit, lock solenoid malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Central locks don't work
  • Locks operate with a delay
  • Locks do not respond to commands from the key fob

Causes

  • Open feedback circuit
  • Lock solenoid malfunction
  • Mechanical damage to the lock
  • Control unit malfunction

How to Fix

  1. Check the integrity of the feedback circuit
  2. Check the operation of the lock solenoid
  3. Inspect the lock mechanism for damage
  4. Check the operation of the control unit

Related codes

B2130B2131

FAQ

What does the B2129 code mean?

B2129 is an OBD-II diagnostic trouble code that indicates: Central Lock Feedback Failure

What causes a B2129 error code?

The most common causes of B2129 include: Open feedback circuit; Lock solenoid malfunction; Mechanical damage to the lock; Control unit malfunction.

How do I fix a B2129 diagnostic trouble code?

To fix B2129: Check the integrity of the feedback circuit. Check the operation of the lock solenoid. Inspect the lock mechanism for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2129?

Limited driving only, diagnose soon

How much does it cost to fix B2129?

The estimated repair cost for B2129 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat