P0679 Code - Cylinder 9 Glow Plug Circuit Fault

What Does P0679 Mean?

OBD-II Code Hard or no start in cold weather is defined as a Cylinder 9 Glow Plug Circuit/Open

The Glow Plug is used on diesel engines to preheat the cylinder before the engine is started. If the engine control module (PCM) detects the glow plug for cylinder nine is not operating properly, the PCM will set code P0679.

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What are the common causes of P0679 ?

Common causes of this code may include (but are not limited to) faulty glow plugs, a faulty glow plug relay, a bad glow plug timer or module, shorted or open wiring in the glow plug circuit, loose or corroded electrical connectors in the glow plug circuit. Blown fuses are also a common problem but there is usually an underlying problem that caused a fuse to blow. Repair codes in the order that they appear on the code reader or scanner. Freeze frame data can also be helpful in diagnosing this condition.



How do you troubleshoot P0679 ?

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Searches related to P0679 Code - Cylinder 9 Glow Plug Circuit Fault

• P0679
• P0678