P0335: Crankshaft Position Sensor A Circuit Malfunction

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Summary

The P0335 diagnostic trouble code is a common issue encountered in various vehicle models, including Acura TSX, Lexus, and Nissan. This code indicates a problem with the Crankshaft Position Sensor (CKP) A circuit, suggesting a potential issue with the sensor itself or its associated wiring and connections.

Understanding the Crankshaft Position Sensor

p0335

The Crankshaft Position Sensor (CKP) is a critical component in the engine management system, responsible for providing the Powertrain Control Module (PCM) with information about the engine’s crankshaft position and speed. This data is essential for proper fuel injection, ignition timing, and other engine management functions.

The CKP sensor is typically located near the crankshaft, and it uses a magnetic field to detect the rotation of the crankshaft. As the crankshaft rotates, the sensor generates a series of electrical pulses that the PCM interprets to determine the engine’s operating conditions.

Causes of the P0335 Code

The P0335 code can be triggered by a variety of issues, including:

  1. Faulty Crankshaft Position Sensor: The most common cause of the P0335 code is a malfunctioning CKP sensor. Over time, the sensor can wear out, become damaged, or fail to provide the PCM with accurate crankshaft position and speed information.

  2. Wiring or Connector Issues: Problems with the wiring harness or connectors associated with the CKP sensor can also trigger the P0335 code. This can include loose, damaged, or corroded connections.

  3. Electrical Interference: Electromagnetic interference from other vehicle components, such as ignition coils or alternators, can disrupt the CKP sensor’s signal and cause the P0335 code to set.

  4. Mechanical Issues: In some cases, mechanical problems within the engine, such as a worn or damaged crankshaft, can lead to inconsistent crankshaft position and speed, resulting in the P0335 code.

  5. Weak Car Key Battery: In the case of the Acura TSX, a weak car key battery can sometimes trigger a false P0335 code, leading to limp mode operation.

Diagnosing the P0335 Code

To diagnose and address the P0335 code, it is essential to follow a systematic approach:

  1. Scan Tool Diagnosis: Use a diagnostic scan tool to read any additional trouble codes that may be present, as well as to retrieve any stored data related to the CKP sensor’s performance.

  2. Visual Inspection: Carefully inspect the CKP sensor, its wiring harness, and connectors for any signs of damage, corrosion, or loose connections.

  3. Electrical Testing: Perform voltage, resistance, and continuity tests on the CKP sensor and its associated wiring to ensure proper electrical operation.

  4. Sensor Replacement: If the CKP sensor is found to be faulty, replace it with a new, OEM-approved component.

  5. Relearn Procedure: After replacing the CKP sensor, it may be necessary to perform a relearn procedure to ensure the PCM is properly calibrated to the new sensor.

  6. Intermittent Issue Diagnosis: In some cases, the P0335 code may be intermittent, indicating an issue that is not consistently present. In these situations, additional diagnostic steps, such as monitoring the CKP sensor’s signal with an oscilloscope, may be required.

Addressing the P0335 Code

Once the root cause of the P0335 code has been identified, the appropriate repair steps can be taken to resolve the issue. This may include:

  • Replacing the Crankshaft Position Sensor
  • Repairing or replacing any damaged wiring or connectors
  • Addressing any mechanical issues within the engine
  • Replacing the car key battery (in the case of the Acura TSX)

It is important to note that simply replacing the CKP sensor may not always resolve the problem, as there may be underlying issues that need to be addressed. Thorough diagnosis and a comprehensive repair approach are essential to ensure the P0335 code is properly resolved and does not recur.

Conclusion

The P0335 code is a common issue related to the Crankshaft Position Sensor or its associated circuit. By understanding the role of the CKP sensor, the potential causes of the P0335 code, and the proper diagnostic and repair procedures, vehicle owners and technicians can effectively address this problem and restore their vehicle’s performance.

References

  1. P0335 Crankshaft Position Sensor
  2. Crankshaft Position Sensor Code P0335 and Limp Mode
  3. Error Code P0335 and Solution
  4. Need Help with P0335 Code and Randomly Stuttering
  5. Crankshaft Position Sensor Replacement