Fault code P0683 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0683 – Glow Plug Control Module to PCM Communication Circuit

P0683: Causes, signs and repairs

Error code P0683 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the glow plug control circuit. This DTC P0683 indicates a problem with the communication or power supply of the glow plug control unit. This trouble code may have slightly different names for different manufacturers, but always refers to the glow plug control unit.

What causes can this fault code have?

Defective glow plug control unit
Damaged wiring to the control unit
Corroded or loose plug connections
Defective glow plugs
Broken ground wire
Defective fuse in the glow plug circuit
Faulty CAN bus communication
Voltage problems in the on-board power supply

What symptoms occur in parallel with fault code P0683?

Starting problems: The engine is difficult to start, especially in cold temperatures
Extended starting time: The engine needs more revolutions to start
Uneven idling: The engine runs unevenly after a cold start
White smoke: White smoke comes out of the exhaust during a cold start
Check engine light: The warning light is permanently illuminated
Reduced engine power: Noticeable loss of power when the engine is cold

How to fix the problem of error code P0683?

The repair requires a systematic diagnosis of the glow plug system.
Replacement of the defective glow plug control unit after prior diagnosis of the communication paths
Repair or replace the damaged wiring between the control unit and glow plugs
Cleaning and securing all plug connections in the glow plug circuit
Replacement of defective glow plugs after measuring the resistance of each individual plug
Repairing the earth connection and checking the earthing points
Replacing blown fuses and checking for short circuits
Diagnosis and repair of CAN bus communication errors in the vehicle network
Checking and stabilizing the vehicle electrical system voltage in the event of voltage fluctuations

FAQ - Frequently asked questions about DTC P0683

Can I continue driving with error code P0683?

It is possible to drive in the short term, but you should expect starting problems in cold temperatures. A prompt repair is recommended, as the problem can worsen.

How much does it cost to repair error code P0683?

The costs vary depending on the cause: glow plug replacement 150-400€, control unit replacement 300-800€, cable repair 100-300€. A precise diagnosis costs around €80-120.

How do I recognize defective glow plugs with code P0683?

Typical signs are difficult starting in cold weather, white smoke from the exhaust and rough idling. A resistance measurement of the glow plugs provides information about their condition.

Can I repair error code P0683 myself?

Simple work such as replacing fuses or cleaning plug connections is possible. Control unit replacement or cable repairs should be carried out by a specialist workshop.

Why does code P0683 mainly occur in winter?

The glow plugs are subjected to greater stress in cold temperatures. Components that are already weak then fail completely, which is why the fault code occurs more frequently in the cold season.

How long does it take to diagnose fault code P0683?

A professional EOBD diagnosis takes around 30-60 minutes. A complete check of the glow plug system can take 1-2 hours.

Vehicles in which error code P0683 occurs most frequently

Error code P0683 is a specific diesel trouble code for glow plug control problems and can occur in various manufacturers, but is most common in the following vehicles:

Volkswagen: Golf, Passat, Touran, Caddy, Sharan (2004-2015)
Audi: A3, A4, A6, Q5, Q7 (2005-2016)
BMW: 1 Series, 3 Series, 5 Series, X3, X5 (2006-2014)
Mercedes-Benz: C-Class, E-Class, ML, GLK (2007-2015)
Ford: Focus, Mondeo, Galaxy, S-Max (2008-2016)
Opel: Astra, Vectra, Zafira, Insignia (2006-2014)
Peugeot: 307, 308, 407, 508, Partner (2005-2015)
Citroën: C4, C5, Berlingo, Picasso (2006-2016)
Renault: Mégane, Laguna, Scénic, Espace (2007-2015)
Fiat: Bravo, Croma, Doblo, Multipla (2008-2014)

If the code P0683 occurs in your vehicle, you should first have an OBD diagnosis carried out to determine the exact cause. As glow plug problems occur particularly in winter, it is important to have them repaired in good time to avoid starting problems. A professional workshop can quickly identify and replace the defective components using special diagnostic equipment.

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