P0335 Code – Crankshaft Position Sensor Circuit

P0335 Code – Crankshaft Position Sensor Circuit Explained

The P0335 code is a common OBD2 diagnostic trouble code that indicates a malfunction in the crankshaft position sensor circuit. This sensor plays a critical role in engine operation because it monitors the position and rotational speed of the crankshaft.

The engine control unit (ECU) uses this information to determine ignition timing and fuel injection timing. If the ECU loses the signal from the crankshaft position sensor, the engine may run poorly or may not start at all.

When the ECU detects an abnormal signal or no signal from the sensor, it stores the P0335 code and activates the Check Engine Light.

What the P0335 Code Means

The P0335 diagnostic trouble code indicates that the ECU has detected a problem in the crankshaft position sensor circuit.

The issue may involve:

• a faulty crankshaft sensor

• damaged wiring

• poor electrical connections

• ECU signal processing issues

Because the crankshaft sensor is essential for engine synchronization, faults in this system can cause serious engine performance problems.

Where the Crankshaft Position Sensor Is Located

The crankshaft position sensor (CKP) is typically located:

• near the crankshaft pulley

• near the flywheel

• on the engine block close to the crankshaft

The sensor reads a trigger wheel or reluctor ring attached to the crankshaft to determine its exact position.

Common Causes of the P0335 Code

Several mechanical or electrical issues can trigger this code.

Faulty crankshaft position sensor

The sensor may fail due to heat, vibration or internal electronic damage.

Damaged wiring

Broken wires or damaged insulation can interrupt the signal between the sensor and the ECU.

Loose or corroded connectors

Electrical connectors exposed to moisture may develop corrosion.

Damaged reluctor wheel

If the crankshaft trigger wheel is damaged or misaligned, the sensor cannot read it correctly.

ECU problems

Although rare, the ECU itself may fail to process the signal properly.

Symptoms of a P0335 Code

When the P0335 code appears, drivers may experience several noticeable symptoms.

Common symptoms include:

• Check Engine Light illuminated

• Engine hard to start

• Engine stalling

• Engine misfires

• Rough idle

• Loss of engine power

• Engine not starting at all

In many cases, a failed crankshaft sensor can prevent the engine from starting.

How to Diagnose the P0335 Code

Diagnosing the P0335 code requires checking both the sensor and the associated wiring.

Step 1 – Scan the vehicle

Use an OBD2 scanner to confirm the P0335 code and check for additional related codes.

Step 2 – Inspect wiring

Check the crankshaft sensor harness for damage or loose connections.

Step 3 – Check sensor resistance

Measure the resistance of the sensor using a multimeter.

Step 4 – Monitor live data

Use a diagnostic scanner to verify crankshaft RPM signal during engine cranking.

Step 5 – Inspect the reluctor wheel

If possible, inspect the crankshaft trigger wheel for damage or missing teeth.

How to Fix the P0335 Code

Repair solutions depend on the cause identified during diagnosis.

Common repairs include:

• replacing the crankshaft position sensor

• repairing damaged wiring

• cleaning or replacing connectors

• repairing or replacing the reluctor wheel

• updating or replacing the ECU (rare)

In most cases, replacing the crankshaft position sensor resolves the issue.

Can You Drive With a P0335 Code

Driving with a P0335 error code is usually not recommended.

This fault may cause:

• sudden engine stalling

• difficulty starting the engine

• unpredictable engine performance

In severe cases, the engine may stop running completely.

Repair Cost Estimate

Typical repair costs include:

• Crankshaft position sensor replacement: 60 – 250 EUR

• Wiring repair: 50 – 200 EUR

• Reluctor wheel repair: 150 – 500 EUR

Labor costs depend on sensor accessibility and vehicle design.

How to Prevent P0335 Errors

Although some sensor failures are unavoidable, certain maintenance practices can reduce the risk.

Recommended actions include:

• regular engine inspections

• avoiding oil leaks near sensors

• repairing wiring damage early

• keeping engine components clean

Preventive maintenance helps ensure accurate engine timing and reliable performance.

Conclusion

The P0335 code indicates a malfunction in the crankshaft position sensor circuit. Because this sensor is essential for engine timing, a fault in this system can cause serious drivability problems or prevent the engine from starting.

Prompt diagnosis and replacement of a faulty sensor usually restores normal engine operation.