Fault code P1626 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1626 – Theft Deterrent Fuel Enable Signal Not Received/ B+ Supply To VCRM A/C Circuit Malfunction

P1626: Causes, signs and repairs

Error code P1626 is displayed and the check engine light is on - what does this mean?

The DTC P1626 is triggered by the OBD/EOBD system when a problem is detected with the immobilizer or the engine control unit. This manufacturer-specific error code mainly concerns the communication between the immobilizer and the ECU. The exact definition of trouble code P1626 may vary between manufacturers.

What causes can this error code have?

Defective immobilizer
Damaged remote control key
Faulty antenna in the ignition lock
Loose plug connections on the engine control unit
Defective engine control unit (ECU)
Broken cable connections to the immobilizer
Corroded contacts in the fuse box
Faulty power supply
Programming error in the control unit

What symptoms occur in parallel with error code P1626?

Starting problems: The vehicle cannot be started or is difficult to start
Check engine light: The warning light in the dashboard lights up continuously
Immobilizer active: The immobilizer symbol flashes or is permanently illuminated
Engine stalls: The engine starts briefly and then stops again
Idle problems: The engine runs unevenly at idle speed
Key is not recognized: The system does not recognize the vehicle key

How can I fix the problem with fault code P1626?

Repairing fault code P1626 requires a systematic diagnosis of the affected components.
Checking and replacing the remote control key and reprogramming in the vehicle
Cleaning or replacing the antenna coil in the ignition lock and checking the connecting cables
Checking all plug connections on the engine control unit and cleaning corroded contacts
Replacing the defective engine control unit and subsequent programming with vehicle data
Repair of broken cable connections between immobilizer and ECU
Reprogramming the immobilizer with appropriate diagnostic software
Checking and repairing the power supply to the immobilizer system

FAQ - Frequently asked questions about DTC P1626

Can I continue driving with error code P1626?

No, you should not continue driving with P1626, as the vehicle will usually not start at all or may stop while you are driving. The immobilizer prevents the engine from operating normally.

How much does it cost to repair error code P1626?

The repair costs for P1626 vary between 150-800 euros, depending on the cause. A new key costs 80-200 euros, while an engine control unit can cost 400-1200 euros.

Is the error code P1626 the same for all manufacturers?

No, P1626 is a manufacturer-specific code and can have different meanings for different brands. The exact definition depends on the respective vehicle manufacturer.

Can I repair error code P1626 myself?

You can carry out simple measures such as changing the battery in the key yourself. However, more complex repairs to the immobilizer require special tools and should be carried out by a specialist workshop.

How long does it take to repair P1626?

The repair usually takes 1-4 hours, depending on the cause. Simple key programming takes 30 minutes, while replacing the engine control unit can take several hours.

Does error code P1626 occur frequently?

P1626 is a relatively rare EOBD code that mainly occurs in older vehicles or after improper repairs. Modern immobilizer systems are usually more reliable.

Vehicles in which error code P1626 occurs most frequently

Error code P1626 is a manufacturer-specific DTC that indicates problems with the immobilizer or engine management system and can have different meanings depending on the manufacturer, but is most common in the following vehicles:

Chrysler: 300C, Sebring, PT Cruiser (2004-2010)
Dodge: Charger, Magnum, Caliber, Avenger (2005-2012)
Jeep: Grand Cherokee, Commander, Compass (2005-2010)
Mitsubishi: Lancer, Outlander, Eclipse (2003-2009)
Hyundai: Elantra, Sonata, Tucson (2006-2011)
Kia: Optima, Sorento, Sportage (2005-2010)
Volkswagen: Golf, Passat, Jetta (2000-2008)
Audi: A3, A4, A6 (2001-2007)

If code P1626 occurs in your vehicle, you should first check the vehicle battery and the key before visiting a specialist workshop. As this is a safety-relevant error code that affects the immobilizer, a professional diagnosis is usually unavoidable. The exact meaning and repair can vary considerably depending on the vehicle brand, which is why manufacturer-specific diagnostic equipment is required.

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