P0335: Crankshaft Position Sensor A Circuit Malfunction
Updated November 12, 2026
The crankshaft position sensor tells the engine computer how fast the engine is turning and where the pistons are. Without a good signal the engine may not start or may stall.
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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- A failed crankshaft position sensor
- Damaged wiring or a loose connector
- A damaged reluctor (tone) ring
- Debris on a magnetic sensor tip
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Engine cranks but won't start
- Stalling, especially when hot
- Check engine light, sometimes with no tachometer reading
Is it safe to drive?
Not recommended: the engine can stall without warning, including in traffic.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- Check the connector and wiring near the sensor.
- With a scan tool, see if RPM shows while cranking; no RPM points to the sensor or circuit.
- Inspect the sensor tip for damage or metal debris.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
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Questions
What does P0335 mean?
P0335 is the generic OBD2 code for "Crankshaft Position Sensor A Circuit Malfunction." The crankshaft position sensor tells the engine computer how fast the engine is turning and where the pistons are. Without a good signal the engine may not start or may stall.
Is it safe to drive with P0335?
Not recommended: the engine can stall without warning, including in traffic.
How do I check P0335 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: Check the connector and wiring near the sensor. With a scan tool, see if RPM shows while cranking; no RPM points to the sensor or circuit. Inspect the sensor tip for damage or metal debris.
Related codes
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