OBD Guide
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B2797

Communication Malfunction No. 1 Immobilizer System

B2797 is an OBD-II diagnostic trouble code meaning: Communication Malfunction No. 1 Immobilizer System. Common causes: open or short circuit in the immobilizer wiring harness, immobilizer module malfunction. 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
  • Check Engine Light Is On

Causes

  • Open or short circuit in the immobilizer wiring harness
  • Immobilizer module malfunction
  • Damage to the key reading antenna
  • Problems with the engine ECU
  • Incorrect key programming

How to Fix

  1. Check the integrity of the immobilizer wiring harness
  2. Diagnose the immobilizer module
  3. Check the key reading antenna
  4. Scan the ECU for other errors
  5. Reprogram the key if necessary

Related codes

B2798B2799P0513

FAQ

What does the B2797 code mean?

B2797 is an OBD-II diagnostic trouble code that indicates: Communication Malfunction No. 1 Immobilizer System

What causes a B2797 error code?

The most common causes of B2797 include: Open or short circuit in the immobilizer wiring harness; Immobilizer module malfunction; Damage to the key reading antenna; Problems with the engine ECU.

How do I fix a B2797 diagnostic trouble code?

To fix B2797: Check the integrity of the immobilizer wiring harness. Diagnose the immobilizer module. Check the key reading antenna. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2797?

Yes, but get it checked soon

How much does it cost to fix B2797?

The estimated repair cost for B2797 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat