OBD Guide
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B2431

Transponder Programming Failed

B2431 is an OBD-II diagnostic trouble code meaning: Transponder Programming Failed. Common causes: transponder fault in the key, problems with the immobilizer control unit. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • The immobilizer indicator is flashing
  • The key is not recognized by the system

Causes

  • Transponder fault in the key
  • Problems with the immobilizer control unit
  • Damage to the wiring harness between the control unit and the transponder antenna
  • Control unit software failure

How to Fix

  1. Check the status of the transponder in the key
  2. Diagnose the immobilizer control unit
  3. Check the integrity of the wiring harness
  4. Reprogram the transponder or control unit
  5. Replace faulty components if necessary

Related codes

B2432B2433P0513

FAQ

What does the B2431 code mean?

B2431 is an OBD-II diagnostic trouble code that indicates: Transponder Programming Failed

What causes a B2431 error code?

The most common causes of B2431 include: Transponder fault in the key; Problems with the immobilizer control unit; Damage to the wiring harness between the control unit and the transponder antenna; Control unit software failure.

How do I fix a B2431 diagnostic trouble code?

To fix B2431: Check the status of the transponder in the key. Diagnose the immobilizer control unit. Check the integrity of the wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2431?

Yes, but get it checked soon

How much does it cost to fix B2431?

The estimated repair cost for B2431 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat