P0322 Ignition/Distributor Engine Speed Input Circuit No Signal

P0322 indicates no signal from the ignition or distributor engine speed input circuit. During cranking or running, the controller is missing an expected speed reference.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not keep cranking a no-start with P0322 until the missing speed signal path is identified.

Symptoms of P0322

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0322

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Watch scan-tool RPM while cranking, check spark and injector enable, and compare crankshaft, distributor, or ignition reference signals if equipped.
Inspect open circuits, shorted signal wires, failed sensor power or ground, damaged connectors, tone wheel damage, and ignition module faults.
Confirm the signal at the sensor and at the controller to separate a failed sensor from harness or module input problems.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.