DTC P005B ‘B’ Camshaft Profile Actuator ‘A’ Control Stuck On Bank 1

DTC P005B is a diagnostic trouble code indicating that the ‘B’ camshaft profile actuator ‘A’ on Bank 1 is stuck in the “on” position. Understanding and addressing this issue is crucial for maintaining your vehicle’s efficiency and performance. In this article, we’ll delve into the details of DTC P005B, exploring what it means, its potential causes, and how to diagnose and fix this issue effectively.

What is DTC P005B?

The P005B diagnostic trouble code (DTC) signifies a problem with the ‘B’ camshaft profile actuator ‘A’ control being stuck in the “on” position on Bank 1. The camshaft profile actuator is responsible for adjusting the camshaft timing to optimize engine performance, efficiency, and emissions. When the actuator is stuck in the “on” position, the engine control unit (ECU) cannot correctly adjust the camshaft timing, leading to suboptimal engine performance, reduced fuel efficiency, and increased emissions.

Potential Causes of DTC P005B:

The P005B code is triggered when the ECU detects that the camshaft profile actuator is stuck in the “on” position. This can happen due to several reasons:

  • Faulty Camshaft Profile Actuator: The actuator itself may be malfunctioning and unable to return to the “off” position.
  • Wiring Issues: Damaged, corroded, or shorted wiring in the camshaft actuator control circuit can lead to performance issues.
  • Connector Problems: Loose or damaged connectors can disrupt the electrical pathway, causing the actuator to malfunction.
  • Oil Flow Issues: Insufficient or contaminated oil can affect the actuator’s performance, as it relies on proper oil pressure to operate.
  • Faulty ECU: Although rare, a malfunctioning ECU could incorrectly control the camshaft actuator.

Symptoms of P005B

When the P005B code is set, you might experience the following symptoms:

  • Check Engine Light (CEL) illuminated on the dashboard.
  • Decreased engine performance.
  • Poor fuel efficiency.
  • Increased emissions.
  • Possible rough idling or engine misfires due to incorrect camshaft timing adjustments.

Diagnostic and Repair Procedures for DTC P005B:

Diagnosing and resolving the P005B code requires a systematic approach:

  1. Initial Inspection: Connect a diagnostic scanner to the vehicle’s OBD-II port to retrieve the trouble codes, including P005B. Record any additional codes and freeze frame data to understand the conditions under which the code was set.
  2. Visual Inspection: Conduct a thorough visual inspection of the camshaft profile actuator and its wiring harness. Look for signs of damage, corrosion, or disconnections.
  3. Check Actuator Operation: Test the camshaft profile actuator for proper operation. Use a diagnostic tool to activate the actuator and verify its movement. Replace the actuator if it is stuck or not functioning correctly.
  4. Inspect Wiring and Connectors: Check the wiring and connectors in the camshaft actuator control circuit for continuity. Look for loose connections, short circuits, broken wires, or corroded terminals. Repair or replace any damaged components.
  5. Oil Inspection: Ensure that the engine oil level is adequate and the oil is clean. Replace the oil and filter if contaminated or old, as proper oil flow is crucial for actuator operation.
  6. Check for Blockages: Inspect the oil passages leading to the camshaft actuator for any blockages or restrictions. Clean or replace any clogged passages to ensure proper oil flow.
  7. Test Voltage Supply: Verify that the camshaft actuator control circuit is receiving the correct voltage. Use a multimeter to check for proper power supply to the actuator. If the voltage supply is too high or too low, trace back to the source and repair any issues.
  8. Check ECU: Although rare, inspect the ECU for any potential faults that could cause incorrect control of the camshaft actuator. Reprogram or replace the ECU if necessary.
  9. Clear Codes and Perform Test Drive: After completing the repairs, clear the trouble codes from the vehicle’s memory using the diagnostic scanner. Perform a test drive to ensure the vehicle operates properly and that the P005B code does not return.


Understanding and addressing DTC P005B is essential for maintaining optimal engine performance and fuel efficiency. By following these detailed diagnostic and repair procedures, you can effectively address the P005B trouble code, ensuring the vehicle’s camshaft profile actuator operates correctly and the camshaft timing is properly adjusted. Regular maintenance and careful inspection of the camshaft actuator and its control circuit can help prevent this code from appearing. If you found this guide helpful, please share it with fellow automotive enthusiasts and technicians. For more detailed guides and tips on car maintenance and repair, visit our website.