P0322
Ignition/Distributor Engine Speed Input Circuit No Signal
Ignition / engine speed input
Generic OBD-II
High
What it means
P0322 means the engine computer is getting no signal from the ignition/distributor engine-speed (RPM) input circuit. The ECM relies on this signal to time spark and fuel, so a lost signal can cause hard starting, stalling, or a no-start until the sensor or its wiring is repaired.
High
Can I keep driving? Risky — the ECM may lose the RPM signal it needs for spark and fuel timing, which can cause stalling or a no-start; have it repaired before relying on the vehicle.
Common symptoms
What you'll notice
- Check-engine light on
- Hard starting, stalling, or a no-start
- Engine misfires or runs erratically
- Tachometer reading erratically or dropping to zero
Common causes
Most likely first
- Faulty engine speed / RPM (distributor or crank) sensorLikely
- Damaged wiring or a poor connector in the signal circuitCommon
- Loose or corroded electrical connections or groundCommon
- Failed ignition or distributor moduleLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the speed-sensor connector and wiring for damage or corrosion.
- Check the sensor's air gap and mounting, and test its signal output while cranking.
- Verify continuity, power, and ground on the signal circuit back to the module/ECM.
- Replace the engine speed sensor or ignition/distributor module if testing confirms it. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0322?+
Not really — losing the engine-speed signal can cause a sudden stall or prevent the engine from starting. Address it promptly.
Can I just clear P0322?+
You can, but if the signal is genuinely dropping out the code returns and the engine may stall until it's fixed.
Related codes
Often seen with P0322
Read & clear P0322 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX