OBD Guide
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P1649

Immobilizer Security Code Not Programmed

P1649 is an OBD-II diagnostic trouble code meaning: Immobilizer Security Code Not Programmed. Common causes: immobilizer code not programmed, problems with communication between the ecu and the immobilizer. 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 engine stalls immediately after starting
  • The immobilizer indicator is on
  • Check Engine light comes on

Causes

  • Immobilizer code not programmed
  • Problems with communication between the ECU and the immobilizer
  • Immobilizer unit malfunction
  • Replacing ECU without reprogramming
  • Damage to the security system wiring harness

How to Fix

  1. Diagnostics of the immobilizer system
  2. Checking connections and wiring
  3. Reprogramming the immobilizer code
  4. Replacing a faulty immobilizer unit if necessary
  5. Repair only from an authorized dealer

Related codes

P1650P1651P1630

Error P1649 by Vehicle Brand

MazdaVolkswagen

FAQ

What does the P1649 code mean?

P1649 is an OBD-II diagnostic trouble code that indicates: Immobilizer Security Code Not Programmed

What causes a P1649 error code?

The most common causes of P1649 include: Immobilizer code not programmed; Problems with communication between the ECU and the immobilizer; Immobilizer unit malfunction; Replacing ECU without reprogramming.

How do I fix a P1649 diagnostic trouble code?

To fix P1649: Diagnostics of the immobilizer system. Checking connections and wiring. Reprogramming the immobilizer code. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1649?

Yes, but get it checked soon

How much does it cost to fix P1649?

The estimated repair cost for P1649 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat