P0684 Code - Glow Plug Control Module to ECM Communication Circuit Range/Performance

What Does P0684 Mean?

OBD-II Code Hard or no start in cold weather is defined as a Glow Plug Control Module to PCM Communication Circuit
The Glow Plug Module controls the glow plugs used on diesel engines to preheat the cylinder before the engine is started. If the engine control module (PCM) cannot communicate with the Glow Plug Module, the PCM will set code P0684.

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What are the common causes of P0684 ?

• The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
• Defective ECU strategies or components will prevent proper regeneration
• Some aftermarket accessories and performance modifications

How do you troubleshoot P0684 ?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the P0684 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.

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