OBD Guide
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B279C

Theft Deterrent System Presence Detection

B279C is an OBD-II diagnostic trouble code meaning: Theft Deterrent System Presence Detection. Common causes: key detection sensor malfunction, damage to the anti-theft system wiring harness. 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
  • Anti-theft indicator flashes
  • The system does not recognize the ignition key

Causes

  • Key detection sensor malfunction
  • Damage to the anti-theft system wiring harness
  • Malfunction of the anti-theft control module
  • Problems with the key transponder

How to Fix

  1. Check the condition of the ignition key and transponder
  2. Check the integrity of the anti-theft system wiring harness
  3. Diagnose the anti-theft system control module
  4. Replace faulty components

Related codes

B279DB279E

FAQ

What does the B279C code mean?

B279C is an OBD-II diagnostic trouble code that indicates: Theft Deterrent System Presence Detection

What causes a B279C error code?

The most common causes of B279C include: Key detection sensor malfunction; Damage to the anti-theft system wiring harness; Malfunction of the anti-theft control module; Problems with the key transponder.

How do I fix a B279C diagnostic trouble code?

To fix B279C: Check the condition of the ignition key and transponder. Check the integrity of the anti-theft system wiring harness. Diagnose the anti-theft system control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B279C?

Yes, but get it checked soon

How much does it cost to fix B279C?

The estimated repair cost for B279C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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