Faulty crankshaft position sensor (internal failure or heat-related breakdown); Damaged, chafed or corroded wiring or connector in the sensor circuit; Metallic debris or oil contamination on the sensor tip, or incorrect air gap or loose sensor mounting; Damaged or dirty reluctor (trigger) wheel or tone ring, or a loose or damaged crank pulley; Low battery voltage or poor earth or power supply to the sensor; Timing chain or belt fault leading to a crank and cam correlation problem (depends on engine); Fault within the engine control unit.

P0335

Crankshaft Position Sensor A Circuit.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
3: AreaIgnition system or misfire
35: FaultThe specific fault in that area

What it means

P0335 is the generic code for a fault in the crankshaft position sensor 'A' circuit. The engine control unit has seen no signal, an erratic signal or an implausible signal from the crankshaft sensor while the engine is cranking or running. Because the crank signal is the main reference for engine speed and piston position, the fault often causes a no-start or a stall.

Symptoms

Engine cranks but will not start
Engine stalls unexpectedly, often when warm
Intermittent misfire or rough running
Rev counter drops to zero or flickers while driving
Engine management warning light on
Hesitation or loss of power under load

Possible causes

Faulty crankshaft position sensor (internal failure or heat-related breakdown)likely
Damaged, chafed or corroded wiring or connector in the sensor circuitlikely
Metallic debris or oil contamination on the sensor tip, or incorrect air gap or loose sensor mountingpossible
Damaged or dirty reluctor (trigger) wheel or tone ring, or a loose or damaged crank pulleypossible
Low battery voltage or poor earth or power supply to the sensorpossible
Timing chain or belt fault leading to a crank and cam correlation problem (depends on engine)rare
Fault within the engine control unitrare

How to diagnose

Read all stored codes and freeze frame data, noting engine speed, temperature and whether the fault is current or intermittent; check for related cam sensor codes
Check the battery condition and charging voltage, as low voltage during cranking can upset sensor signals
Inspect the sensor, wiring and connector for oil, heat damage, chafing, corrosion and a secure fit
Check live data for engine speed while cranking; a reading of zero on a healthy starter suggests no crank signal
Test the sensor supply, earth and signal wires for continuity, short circuits and resistance against the manufacturer's specifications (the sensor type, inductive or Hall effect, depends on the model)
View the sensor signal on an oscilloscope while cranking, checking for dropouts or missing teeth patterns
Remove the sensor and inspect its tip and the reluctor wheel for damage, debris or excessive play
If signals are good, check cam and crank correlation and the timing components per the manufacturer's procedure

How to fix

Replace the crankshaft position sensor with a quality part and make sure it is seated and torqued correctly
Repair or replace damaged wiring, connectors or terminals in the sensor circuit
Clean contamination from the sensor and mounting area, and correct the air gap where adjustable
Repair or replace a damaged reluctor wheel, crank pulley or related components
Correct battery, charging or earth faults, then clear the code and confirm it does not return
Where the engine control unit is proven faulty, repair or replace it and carry out any required programming

Can I keep driving?

High severity

Avoid driving the car if it stalls or hesitates, as losing power suddenly in traffic is unsafe. If it starts and runs normally, limit use to getting it to a workshop promptly, as it may fail to restart.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.