Code Definition

P0320 — Ignition/Distributor Engine Speed Input Circuit Malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0320

P0320 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0320 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0320 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0320 fault code is set when the powertrain control module (PCM) detects an issue with the engine speed input signal from the ignition/distributor system or the crankshaft position sensor. This signal is crucial for monitoring and controlling ignition timing and fuel injection. A malfunction may result from a loss of input signal, erratic readings, or circuit-related problems.

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