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DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P005B

P005BB Camshaft Profile Actuator A Control Stuck On Bank 1

P005B means the engine computer has commanded the bank 1 B camshaft profile actuator to move, but the actuator's control circuit is stuck in the on or energized state, so the camshaft profile cannot be changed as requested. The computer detects this by comparing the commanded actuator state against the electrical feedback from the actuator circuit and flagging a persistent mismatch.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other symptoms besides the warning light
  • Reduced engine power or a limp-home mode because the cam profile stays in one position
  • Rough idle, misfire, or unstable engine operation at low speed
  • Poor fuel economy or increased emissions due to incorrect valve timing
  • A noticeable change in engine sound or responsiveness when the computer tries to switch cam profiles
  • In some vehicles, a message on the driver information display about reduced engine performance

Common causes, most likely first

  1. A failed camshaft profile actuator solenoid that is mechanically stuck in the energized position
  2. A short to voltage in the actuator control wire between the engine computer and the actuator
  3. A shorted actuator solenoid winding that keeps the circuit continuously energized
  4. Contaminated engine oil or sludge blocking the actuator's oil passages and preventing it from returning
  5. A faulty engine computer driver circuit that holds the control output on
  6. Corroded or damaged connector pins at the actuator or computer causing an intermittent short
  7. An aftermarket or incorrect actuator installed previously that does not match the vehicle's control strategy

How to diagnose and fix it

  1. Scan all modules for stored and pending codes and record freeze-frame data to confirm the fault conditions
  2. Inspect the actuator connector and wiring harness for chafing, corrosion, or signs of a short to voltage
  3. Measure resistance across the actuator solenoid and compare it to the manufacturer's specification
  4. With the key on and the actuator disconnected, check the control wire for voltage that should not be present when the actuator is commanded off
  5. Verify engine oil condition and level, and check for sludge or restricted oil passages feeding the actuator
  6. If electrical checks pass, command the actuator with a scan tool and observe whether it responds or remains stuck on
  7. Replace the actuator only after confirming the circuit is not shorted, then clear codes and verify the repair with a road test

What a stuck-on actuator really means

  • A short to voltage in the control wire is often mistaken for a failed actuator, so always check the wire for unwanted voltage before replacing the solenoid.
  • Dirty engine oil is a common hidden cause because sludge can physically hold the actuator spool in the energized position even when the electrical circuit is healthy.
  • This code does not always mean the actuator itself has failed; a stuck-on condition can be caused by the engine computer holding the output on due to an internal driver fault.
  • Some vehicles set P005B after a battery replacement or low-voltage event because the computer loses its learned actuator positions and misinterprets the feedback signal.
  • A camshaft profile actuator that sticks on can cause valve-to-piston contact in extreme cases, so ignoring the warning light risks mechanical engine damage.

Can I keep driving with P005B?

You can usually drive the vehicle to a repair shop, but avoid hard acceleration and sustained high speeds because the camshaft profile may remain stuck in the wrong position and cause poor running or engine damage. If the engine runs roughly, misfires, or enters limp mode, stop driving and have it towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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