OBD Guide
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B2723

PASS-Key Detection Circuit

B2723 is an OBD-II diagnostic trouble code meaning: PASS-Key Detection Circuit. Common causes: faulty ignition key (chip), damaged pass-key reader antenna. 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
  • Engine stalls after starting
  • The immobilizer indicator is flashing
  • A security system malfunction message appears on the dashboard

Causes

  • Faulty ignition key (chip)
  • Damaged PASS-Key reader antenna
  • Open or short circuit in wiring harness
  • Faulty immobilizer module
  • Problems with power or grounding of the circuit

How to Fix

  1. Check the ignition key (use a spare key)
  2. Inspect the reader antenna for damage
  3. Check the integrity of the wiring harness and connections
  4. Scan the immobilizer module for errors
  5. If necessary, replace faulty components and reprogram the system

Related codes

B2721B2722B2724

FAQ

What does the B2723 code mean?

B2723 is an OBD-II diagnostic trouble code that indicates: PASS-Key Detection Circuit

What causes a B2723 error code?

The most common causes of B2723 include: Faulty ignition key (chip); Damaged PASS-Key reader antenna; Open or short circuit in wiring harness; Faulty immobilizer module.

How do I fix a B2723 diagnostic trouble code?

To fix B2723: Check the ignition key (use a spare key). Inspect the reader antenna for damage. Check the integrity of the wiring harness and connections. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2723?

Yes, but get it checked soon

How much does it cost to fix B2723?

The estimated repair cost for B2723 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat