The OBD2 P0335 code indicates a problem with the crankshaft position sensor (CKP) circuit. This sensor is vital for engine operation, providing information to the engine control module (ECM) about the crankshaft’s position and speed. This data is crucial for determining ignition timing and fuel injection. A malfunctioning CKP circuit can lead to various driveability issues. This article will delve into the causes, symptoms, and possible solutions for the P0335 code.
What Causes a P0335 Code?
The P0335 code, indicating a Crankshaft Position Sensor “A” Circuit Malfunction, can be triggered by several issues:
- Faulty Crankshaft Position Sensor: The sensor itself may be damaged or worn out, failing to generate the necessary signals.
- Damaged Wiring or Connectors: Wiring harnesses and connectors in the CKP circuit can become frayed, corroded, or disconnected, disrupting signal transmission.
- Timing Belt or Chain Issues: A stretched or broken timing belt/chain can affect the crankshaft’s position and trigger the code.
- Damaged Reluctor Ring: The reluctor ring, a toothed wheel attached to the crankshaft, can be damaged, affecting the sensor’s ability to detect crankshaft position. This can include damage to the teeth or a sheared-off keyway.
- Faulty ECM: In rare cases, a malfunctioning ECM can incorrectly interpret signals or fail to communicate with the CKP sensor. This is less common but should be considered.
Recognizing the Symptoms of a P0335 Code
Symptoms of a P0335 code can vary depending on the vehicle and the extent of the problem. Common symptoms include:
- Check Engine Light Illumination: The most obvious symptom is the illumination of the check engine light on the dashboard.
- Engine Misfires: The engine may misfire due to incorrect ignition timing.
- Starting Problems: The engine may crank but fail to start, especially if the CKP sensor is used for both misfire detection and spark timing.
- Rough Idle: The engine may idle roughly or stall.
- Reduced Engine Performance: You might experience a loss of power or acceleration.
Diagnosing and Fixing a P0335 Code
Troubleshooting a P0335 code involves several steps:
- Retrieve the Code: Use an OBD2 scanner to confirm the P0335 code and check for any other related codes.
- Visual Inspection: Inspect the CKP sensor, wiring harness, and connectors for any visible damage, loose connections, or corrosion.
- Signal Testing: Use a multimeter or oscilloscope to test the voltage and signal from the CKP sensor. This will help determine if the sensor is generating the proper signal. If no signal is present, further diagnostics of the wiring and sensor are required.
- Component Testing: Test the resistance of the CKP sensor using a multimeter to ensure it falls within the manufacturer’s specifications.
- Reluctor Ring Inspection: Inspect the reluctor ring for any damage to the teeth or keyway.
- ECM Testing: If all other components check out, the ECM may need to be tested by a qualified technician.
Conclusion
The OBD2 P0335 code signifies a problem with the crankshaft position sensor circuit, a critical component for engine operation. By understanding the causes, symptoms, and diagnostic procedures, you can effectively address this issue and ensure your vehicle runs smoothly. While some simple checks can be performed by car owners, more complex diagnostics and repairs often require the expertise of a qualified mechanic equipped with specialized tools like a scope. Addressing this issue promptly can prevent further engine damage and restore vehicle performance.
