P0671 Code - Cylinder 1 Glow Plug Circuit Fault

What Does P0671 Mean?

OBD-II Code Hard or no start in cold weather is defined as a Cylinder 1 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 one is not operating properly, the PCM will set code P0671.

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What are the common causes of P0671 ?

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 P0671 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0671 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

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