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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor or pickup failedCommon
Parts involved
- Ignition Distributor
- Crankshaft Position Sensor
P0320 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.