Possible causes – Faulty Ignition/Distributor engine speed sensor– Faulty Crankshaft Position sensor– Ignition/Distributor engine speed sensor harness is open or shorted– Ignition/Distributor engine speed sensor circuit poor electrical connection– Low battery charge– Faulty Engine Control Module (ECM) When is the obd code mean? The P0320 code is triggered when the Engine Control Module (ECM) detect…