P0676 Fault Code

Cylinder 6 Glow Plug Circuit

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

The P0676 fault code indicates a problem with the glow plug circuit associated with cylinder 6 of a diesel engine. Glow plugs are crucial for pre-heating the engine to ensure smooth starting and efficient combustion, especially in cold weather conditions. If the glow plug circuit for cylinder 6 is malfunctioning, it can lead to hard starting, increased emissions, and rough engine performance.

What are the symptoms of the P0676 code?

Drivers may experience a variety of symptoms when the P0676 code is present, including:

• Difficulty starting the engine, especially in cold weather
• Increased engine cranking time
• Illuminated check engine light on the dashboard
• Engine misfires or poor performance while running
• Increased exhaust smoke, particularly during startup

What causes the P0676 code?

Several factors can contribute to the P0676 fault code, including:

• A faulty glow plug in cylinder 6
• Wiring issues such as short circuits or open circuits in the glow plug circuit
• Bad connections or corrosion at the glow plug terminals
• Problems with the glow plug relay or control module
• Failing engine control unit (ECU) that improperly monitors the glow plug circuit

How to fix P0676?

Diagnosing and fixing the P0676 fault code typically involves the following steps:

• Use a scan tool to confirm the P0676 code and check for any additional trouble codes.
• Visually inspect the glow plug and its wiring for any signs of damage or corrosion.
• Test the glow plug for continuity and proper operation; replace if faulty.
• Check the glow plug relay and control circuits for proper function.
• Clear the fault code and perform a road test to ensure the issue is resolved.