OBD Guide
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B291B

Content Theft Deterrent Sensor

B291B is an OBD-II diagnostic trouble code meaning: Content Theft Deterrent Sensor. Common causes: damage to the anti-theft sensor, open or shorted wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • False alarms
  • The security system does not respond to theft attempts
  • The malfunction indicator on the instrument panel is on

Causes

  • Damage to the anti-theft sensor
  • Open or shorted wiring harness
  • Control unit malfunction
  • Failures in car electronics

How to Fix

  1. Check the integrity of the wiring harness
  2. Test the anti-theft sensor
  3. Replace sensor if necessary
  4. Check and reflash the control unit if necessary

Related codes

B291AB291CB2920

FAQ

What does the B291B code mean?

B291B is an OBD-II diagnostic trouble code that indicates: Content Theft Deterrent Sensor

What causes a B291B error code?

The most common causes of B291B include: Damage to the anti-theft sensor; Open or shorted wiring harness; Control unit malfunction; Failures in car electronics.

How do I fix a B291B diagnostic trouble code?

To fix B291B: Check the integrity of the wiring harness. Test the anti-theft sensor. Replace sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B291B?

Limited driving only, diagnose soon

How much does it cost to fix B291B?

The estimated repair cost for B291B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat