P0678 Code - Cylinder 8 Glow Plug Circuit Fault

What Does P0678 Mean?

The P0678 code is a generic OBD-II trouble code indicating a problem with the glow plug circuit in cylinder number 8. Glow plugs are used in diesel engines to help warm the engine to aid ignition. The powertrain control module (PCM) helps control this heat. When the voltage from the glow plug circuit in cylinder 8 is more than 10 percent off of the manufacturer’s suggested settings, then the PCM will be alerted, and the P0678 code will be detected.

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What are the common causes of P0678 ?

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 P0678 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0678 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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