P0674 Code - Cylinder 4 Glow Plug Circuit Fault

What Does P0674 Mean?

OBD-II Code Hard or no start in cold weather is defined as a Cylinder 4 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 four is not operating properly, the PCM will set code P0674.

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What are the common causes of P0674 ?

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 P0674 ?

Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0674 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.



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