Code P0320 indicates that the engine control module (PCM) is not receiving a valid signal from the engine speed sensor located within the ignition distributor. This sensor is critical for timing spark and fuel delivery based on the crankshaft's position and speed.
The internal magnetic pickup or Hall effect sensor inside the distributor has suffered an electrical failure.
The wires connecting the distributor sensor to the PCM are frayed, melted, or broken.
Moisture or debris has caused corrosion in the distributor electrical connector, interrupting signal flow.
A worn distributor drive gear or excessive shaft play prevents the sensor from accurately reading the trigger wheel.
The internal circuitry of the engine control module responsible for processing the speed signal has failed.
No, P0320 is a circuit-level fault related to the speed sensor, not a combustion issue caused by spark plugs.
Not necessarily; if the sensor is a separate replaceable component, only the sensor needs replacement. If it is integrated, the distributor assembly may be required.
No. While some may suggest replacing the PCM, it is rarely the cause. The vast majority of P0320 cases are resolved by fixing the sensor or the wiring.