P0676 Cylinder 6 Glow Plug Circuit

Definition: The OBD-II code P0676 indicates a problem with the glow plug circuit in cylinder number 6. This code is set when the Engine Control Module (ECM) detects an issue with the electrical circuit of the glow plug for cylinder 6, which could be due to a faulty glow plug, wiring issues, or a malfunctioning control module.

p0676 – Cylinder 6 Glow Plug Circuit

Severity: Moderate

Common Causes

P0676 – Cylinder 6 Glow Plug Circuit

Description: The PCM has detected a fault in the cylinder 6 glow plug circuit.

Common Causes:

• Faulty glow plug in cylinder 6
• Wiring issues in the glow plug circuit for cylinder 6
• Loose or corroded connections in the glow plug circuit for cylinder 6
• Defective glow plug control module
• PCM software needs to be updated

 

Common Misdiagnosis

OBD2 Code: P0676

Description: Cylinder 6 Glow Plug Circuit

Common Misdiagnosis: Faulty glow plug relay or control module is often misdiagnosed as a faulty glow plug. Additionally, wiring issues such as damaged connectors or corroded wires are sometimes overlooked.

 

Common Diagnostic Steps

OBD2 Code: P0676

Description: Cylinder 6 Glow Plug Circuit

• Check the glow plug: Remove and inspect the glow plug for damage or wear. Replace if necessary.
• Inspect the wiring: Examine the wiring and connectors to cylinder 6’s glow plug for any signs of corrosion, damage, or disconnection.
• Test the glow plug relay: Ensure that the glow plug relay is functioning correctly by testing it with a multimeter.
• Measure resistance: Use an ohmmeter to measure the resistance of the glow plug circuit. Compare it to manufacturer specifications.
• Check power supply: Verify that there is proper voltage supply reaching the glow plug when activated.
• Scan for additional codes: Perform a comprehensive scan to check for other related trouble codes that might indicate a broader issue.