OBD Guide
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B1A7B

Immobilizer Antenna

B1A7B is an OBD-II diagnostic trouble code meaning: Immobilizer Antenna. Common causes: damage to the immobilizer antenna, open or poor contact in the 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
  • The immobilizer indicator is flashing
  • Engine stalls after starting
  • No response to the ignition key

Causes

  • Damage to the immobilizer antenna
  • Open or poor contact in the wiring harness
  • Immobilizer unit malfunction
  • Problems with the ignition key (discharged chip)

How to Fix

  1. Check the integrity of the immobilizer antenna
  2. Check connections and wiring harness
  3. Test the ignition key
  4. Replace the immobilizer antenna if necessary
  5. Reprogram the immobilizer (if required)

Related codes

B1A7AB1A7CP0513

FAQ

What does the B1A7B code mean?

B1A7B is an OBD-II diagnostic trouble code that indicates: Immobilizer Antenna

What causes a B1A7B error code?

The most common causes of B1A7B include: Damage to the immobilizer antenna; Open or poor contact in the wiring harness; Immobilizer unit malfunction; Problems with the ignition key (discharged chip).

How do I fix a B1A7B diagnostic trouble code?

To fix B1A7B: Check the integrity of the immobilizer antenna. Check connections and wiring harness. Test the ignition key. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1A7B?

Yes, but get it checked soon

How much does it cost to fix B1A7B?

The estimated repair cost for B1A7B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat