OBD Guide
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P1259

Immobilizer to PCM Signal Error

P1259 is an OBD-II diagnostic trouble code meaning: Immobilizer to PCM Signal Error. Common causes: immobilizer malfunction, damaged wiring or poor contact. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Engine won't start
  • Engine stalls after starting
  • The immobilizer indicator is on
  • The security light is flashing
  • Lost Communication with PCM

Causes

  • Immobilizer malfunction
  • Damaged wiring or poor contact
  • Ignition key mismatch
  • PCM software failure
  • Problems with immobilizer power supply

How to Fix

  1. Check the condition of the wiring and contacts
  2. Check ignition key and chip
  3. Reset immobilizer system
  4. Update PCM Software
  5. Repair only from an authorized dealer

Related codes

P1260P1261

Error P1259 by Vehicle Brand

AcuraHondaInfinitiVolkswagen

FAQ

What does the P1259 code mean?

P1259 is an OBD-II diagnostic trouble code that indicates: Immobilizer to PCM Signal Error

What causes a P1259 error code?

The most common causes of P1259 include: Immobilizer malfunction; Damaged wiring or poor contact; Ignition key mismatch; PCM software failure.

How do I fix a P1259 diagnostic trouble code?

To fix P1259: Check the condition of the wiring and contacts. Check ignition key and chip. Reset immobilizer system. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1259?

Do not drive — repair immediately

How much does it cost to fix P1259?

The estimated repair cost for P1259 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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