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DTC codes / P2Bxx · Hybrid propulsion / P2B3E

P2B3EB Camshaft Profile Actuator B Control Circuit High Bank 2

P2B3E indicates that the powertrain control module has detected an abnormally high voltage on the control circuit for the Bank 2 B camshaft profile actuator, which is the solenoid that moves the camshaft to a different lobe profile for improved power or efficiency. The circuit is commanding the actuator, but the voltage measured on the control wire is higher than expected, so the module flags a short to power or an open circuit.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • Rough idle or unstable engine operation when the cam profile fails to change.
  • Reduced engine power or poor acceleration because the high-lift profile is unavailable.
  • Intermittent stalling or hesitation during light-throttle driving.
  • A noticeable change in engine sound or vibration at certain speeds.
  • Fuel economy may decrease if the engine stays in a default profile.

Common causes, most likely first

  1. A short to voltage on the control wire between the actuator and the powertrain control module.
  2. A faulty camshaft profile actuator solenoid with an internal short to power.
  3. Corroded, loose, or damaged pins in the actuator or powertrain control module connector.
  4. An open circuit in the ground or power supply wire to the actuator.
  5. A failed powertrain control module driver for that circuit, though this is less common.
  6. Aftermarket electrical accessories tapped into the circuit causing voltage feedback.

How to diagnose and fix it

  1. Connect a scan tool and record the freeze-frame data and any stored codes to confirm the fault is present and not intermittent.
  2. Visually inspect the actuator connector and the powertrain control module connector for corrosion, bent pins, or loose terminals.
  3. Measure the control circuit voltage with a digital multimeter while commanding the actuator on and off with the scan tool.
  4. Check for continuity and short-to-power on the control wire between the actuator and the powertrain control module.
  5. Test the actuator solenoid resistance and compare it to the manufacturer's specification; replace it if out of range.
  6. If the wiring and actuator test good, substitute a known-good actuator or perform a bidirectional test to see if the fault follows the actuator.
  7. As a last step, inspect the powertrain control module for internal driver failure and replace it only after all other tests pass.

What a high voltage code really means

  • A high voltage code on a control circuit often points to a short to power rather than a failed actuator, so testing the wire before replacing parts saves time and money.
  • The camshaft profile actuator may share a power or ground circuit with other solenoids, so a fault in a neighbouring circuit can set this code as a ghost.
  • Intermittent faults can be caused by wire chafing near hot exhaust components or sharp brackets, which a simple wiggle test may reveal.
  • Some vehicles will default to a fixed cam profile when this code sets, so the driver may not notice a performance change until the fault is repaired.
  • A weak battery or charging system can cause false high-voltage codes on solenoid circuits, so always verify system voltage first.

Can I keep driving with P2B3E?

You can usually drive the vehicle with this code, but avoid heavy acceleration and towing until it is repaired because the engine may be in a reduced-power default mode. If the check engine light starts flashing or the engine runs very poorly, stop driving and have it diagnosed immediately.

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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