P0673 Fault Code

Cylinder 3 Glow Plug Circuit

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0673 fault code indicates an issue with the glow plug circuit for cylinder 3 in a diesel engine. The glow plugs are responsible for warming the combustion chamber prior to ignition, which is essential for cold starting. When a fault is detected in the glow plug for this specific cylinder, it may lead to starting difficulties and increased emissions.

What are the symptoms of the P0673 code?

Common symptoms of a P0673 code may include:

• Difficulty starting the engine, especially in cold conditions.
• A rough idle or misfire when the engine is cold.
• Increased exhaust smoke upon startup.
• The check engine light illuminated on the dashboard.

What causes the P0673 code?

The primary causes of a P0673 code can include:

• A faulty glow plug for cylinder 3.
• Damaged or corroded wiring or connectors in the glow plug circuit.
• A malfunctioning glow plug relay.
• Issues with the engine control module (ECM) that affect the glow plug system.

How to fix P0673?

To resolve a P0673 fault code, follow these steps:

• Inspect the glow plug for cylinder 3 and replace it if faulty.
• Check the wiring and connectors for damage or corrosion and repair or replace as necessary.
• Test the glow plug relay for proper function and replace if defective.
• Clear the fault code from the ECM and perform a test drive to ensure that the issue is resolved.