P0335: Crankshaft Position Sensor "A" Circuit
The engine computer has lost or cannot read the signal from the crankshaft position sensor, which tracks engine speed and position.
What P0335 means
The crankshaft position sensor reads teeth on a toothed wheel attached to the crank. From that signal the engine computer knows exactly how fast the engine is turning and where each piston is, which it needs to fire the spark plugs and injectors. RepairPal explains that when this signal is interrupted for any reason, P0335 sets. Losing it completely usually means the engine will not start or will stall without warning. The most common causes are a sensor that has failed, often one that quits when hot, and damaged or oil soaked wiring and connectors. A damaged tone ring or a sensor that is not seated right can also cause it. RepairPal notes that crank sensors are sometimes replaced when the real fault was the camshaft sensor or a poor connection. Shops check for a signal on a scope or scan tool rpm while cranking, test power and ground, and inspect the tone ring if the sensor checks out. Because sudden stalling is a safety risk, fix this one right away.
Common symptoms
- Check engine light on
- Engine cranks but will not start
- Stalling while driving, then no restart
- Hesitation or misfire
- Tachometer dropping to zero or acting erratic
Most common causes
- Failed crankshaft position sensor
- Damaged or corroded sensor wiring or connector
- Damaged reluctor (tone) ring on the crank
- Faulty camshaft position sensor confusing the signal
- Sensor gap wrong or debris on the sensor tip
What to check yourself first
Check the crank sensor connector for oil, corrosion or a loose fit. If the car stalls when hot and restarts after cooling, tell the shop, since that pattern often points to the sensor. Watch the tachometer while cranking; no movement can mean no crank signal.
Typical fixes and what they cost
| Fix | Typical cost | Note |
|---|---|---|
| Replace crankshaft position sensor | $230-$335 | The most common fix. Many fail when hot and work again when cool. |
| Electrical diagnosis to find a wiring or connector fault | $122-$179 | RepairPal lists poor connections and chafed wiring as a common misdiagnosis. |
| Replace camshaft position sensor | $224-$326 | If the camshaft sensor is the real cause, which RepairPal warns is sometimes missed. |
Typical US price ranges for parts and labor, not quotes. Your shop should confirm the cause with a diagnostic before replacing parts.
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Related codes
- P0336 Crankshaft Position Sensor "A" Circuit Range/Performance
- P0340 Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)
- P0016 Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
- P0300 Random/Multiple Cylinder Misfire Detected
- P0341 Camshaft Position Sensor "A" Circuit Range/Performance (Bank 1 or Single Sensor)