P0335 Crankshaft Position Sensor A Circuit Malfunction

P0335 indicates a crankshaft-position sensor A circuit malfunction. Since crank signal is central to timing and RPM calculation, symptoms can include no-start, stalling, or misfire-like behavior.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the sensor without checking signal integrity and mechanical trigger condition; a damaged reluctor or wiring fault can set the same code.

Symptoms of P0335

A no-start or intermittent stalling.
Hard starting or hesitation.
Check-engine light.

Common causes of P0335

A failed crankshaft-position sensor.
Sensor wiring or connector faults.
A damaged crank reluctor ring.
Heat-related sensor dropout when hot.

Useful checks before replacing parts

Check crank-sensor connector, power or reference feed, ground, signal circuit, and harness routing near heat or moving parts.
Look for RPM signal during cranking and compare crank/cam synchronization data if available.
Inspect sensor mounting, tone wheel or reluctor damage, and recent engine or transmission work.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.