P0323
Ignition/Distributor Engine Speed Input Circuit Intermittent
Ignition / engine speed input
Generic OBD-II
High
What it means
P0323 sets when the engine computer sees an interrupted or erratic engine-speed (crankshaft/distributor) signal. Because that signal tells the computer how fast and where the engine is turning, an intermittent fault can cause sudden stalling, hard starting, or an occasional no-start — so it's worth diagnosing promptly.
High
Can I keep driving? Risky — an intermittent engine-speed signal can cause sudden stalling or a no-start, so limit driving until it's diagnosed.
Common symptoms
What you'll notice
- Check-engine light on
- Intermittent stalling or cutting out
- Hard starting or occasional no-start
- Erratic idle or hesitation
Common causes
Most likely first
- Faulty crankshaft position / engine-speed sensorLikely
- Intermittent open, short, or chafed wiring in the sensor circuitCommon
- Loose or corroded connector at the sensor or distributorCommon
- Low or unstable battery/system voltageLess often
- Failed engine control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note the conditions when the fault appears (heat, vibration, bumps).
- Inspect the crank/engine-speed sensor connector and wiring, wiggle-testing for intermittent contact.
- Check battery and charging-system voltage, since low voltage can mimic a signal fault.
- Scope or scan the sensor signal while cranking and running to catch dropouts.
- Replace the sensor if the signal drops out with sound wiring. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0323?+
Not really — because the fault is intermittent, the engine could stall or fail to restart unexpectedly. Have it looked at before relying on the vehicle.
Can I just clear P0323?+
You can, but an intermittent circuit fault will return. Track down the wiring or sensor problem to fix it for good.
Related codes
Often seen with P0323
Read & clear P0323 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