OBD Guide
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B291A

Content Theft Deterrent Assembly

B291A is an OBD-II diagnostic trouble code meaning: Content Theft Deterrent Assembly. Common causes: open or short circuit in the anti-theft system, security sensor malfunction. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Engine won't start
  • The anti-theft indicator is flashing
  • Alarm goes off for no reason

Causes

  • Open or short circuit in the anti-theft system
  • Security sensor malfunction
  • Problems with the system control module
  • Wiring harness damage
  • Low battery

How to Fix

  1. Check battery and charge status
  2. Inspect the wiring harness for damage
  3. Check the anti-theft system sensors
  4. Scan the control module for errors
  5. Replace faulty components if necessary

Related codes

B291BB291CB291D

FAQ

What does the B291A code mean?

B291A is an OBD-II diagnostic trouble code that indicates: Content Theft Deterrent Assembly

What causes a B291A error code?

The most common causes of B291A include: Open or short circuit in the anti-theft system; Security sensor malfunction; Problems with the system control module; Wiring harness damage.

How do I fix a B291A diagnostic trouble code?

To fix B291A: Check battery and charge status. Inspect the wiring harness for damage. Check the anti-theft system sensors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B291A?

Yes, but get it checked soon

How much does it cost to fix B291A?

The estimated repair cost for B291A is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat