Possible causes – Faulty Ignition/Distributor engine speed sensor– Ignition/Distributor engine speed sensor harness is open or shorted– Ignition/Distributor engine speed sensor circuit poor electrical connection– Faulty Crankshaft Position sensor– Low battery charge– Faulty Engine Control Module (ECM) When is the obd code mean? The P0321 code is triggered when the Engine Control Module (ECM) detects…