P0320 — Ignition/Distributor Engine Speed Input Circuit
A general electrical fault is reported on the engine speed input from the ignition/distributor — open, shorted, or out of plausibility. On older systems this is the distributor pickup; on newer ones it is the crank/cam-derived speed signal feeding the ignition driver.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Ignition distributor
- Crankshaft position sensor
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Sensor or pickup failed
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.