P0335 — Crankshaft Position Sensor "A" Circuit Malfunction
The crankshaft position (CKP) sensor signal is missing or implausible. The CKP is essential — without it the ECU cannot synchronise injection or ignition, and the engine will not start or will stall.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Crankshaft position sensor
- Reluctor ring
- Crankshaft position sensor wiring
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Sensor failed (heat damage common)
- Reluctor ring damaged or contaminated with metal debris
- Wiring or connector fault
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.