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P0383

Trouble code P0387 means the PCM has detected a signal from crankshaft position sensor B that is outside the normal variation set by the manufacturer.

Trouble code P0383 means the PCM has detected a low voltage reading of the glow plug heater circuit.

Trouble code P0384 means the PCM detects a malfunction in the voltage reading of the glow plug heater circuit, often due to a faulty glow plug relay.