P0335 — Crankshaft Position Sensor A Circuit
High severityWhat it means
P0335 is stored when the engine control unit sees a fault involving the crankshaft position (CKP) sensor circuit. The crankshaft position sensor tells the control unit engine speed and piston position; without a reliable signal the engine cannot run. The control unit has flagged this circuit or signal as outside its normal operating range.
Common symptoms
- No-start or stalling
- Intermittent cutting out while driving
- Hard starting
Likely causes
- A wiring, connector or ground problem in the circuit
- A failed sensor or actuator in the circuit
- Faulty crankshaft position sensor
- A damaged reluctor/tone ring or incorrect sensor air gap
What to check first
- Inspect the connector and wiring for damage, corrosion or loose pins
- Watch live RPM while cranking — no RPM points to the CKP signal
- Inspect the sensor connector and tone ring
Can you keep driving?
Take it seriously: a failing crank sensor can stall the engine without warning, so avoid driving if it cuts out.
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