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DTC codes / P2Bxx · Hybrid propulsion / P2B3C

P2B3CB Camshaft Profile Actuator B Control Circuit/Open Bank 2

P2B3C indicates that the powertrain control module has detected an open circuit in the control wiring for the Bank 2 B camshaft profile actuator, which is the solenoid that moves the camshaft to a different lobe profile for improved breathing. The computer commands the actuator to change position and monitors the circuit for expected voltage or current, and it sets this code when the circuit remains open or the feedback does not match the command.

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
  • Reduced engine power or a limp-home mode when the actuator is commanded but does not respond
  • Rough idle or poor driveability at low engine speeds due to incorrect camshaft timing
  • Decreased fuel economy because the engine cannot switch to the optimal cam profile
  • Intermittent hesitation or stumble during light acceleration if the open circuit is temperature or vibration sensitive

Common causes, most likely first

  1. Broken or chafed wire in the Bank 2 B camshaft profile actuator control circuit
  2. Corroded or loose electrical connector at the actuator or at the powertrain control module
  3. Failed camshaft profile actuator solenoid with an open internal coil
  4. Open circuit inside the powertrain control module driver for that actuator
  5. Damaged pigtail harness or terminal backed out of the connector
  6. Aftermarket wiring repair or accessory installation that disturbed the circuit

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm P2B3C is the primary fault and not a secondary effect
  2. Visually inspect the Bank 2 B camshaft profile actuator connector and harness for corrosion, chafing, or loose pins
  3. Measure resistance across the actuator solenoid terminals and compare to the manufacturer's specification to rule out an open coil
  4. Back-probe the control circuit at the actuator and at the powertrain control module to check for continuity and voltage drop under load
  5. Check for a short to ground or short to voltage on the control wire that could mimic an open circuit
  6. If the circuit tests good, command the actuator with a scan tool and monitor feedback to determine whether the driver or the actuator is at fault
  7. Repair the open circuit, replace the failed actuator or module as needed, clear codes, and verify the repair with a road test and monitor run

Open Circuit Checks Before Replacing Parts

  • A loose or corroded connector pin is the most common cause of this code, so always wiggle-test the harness while watching live actuator data before condemning the solenoid.
  • The code can set intermittently from vibration or heat, so a circuit that tests good when cold may still be open when the engine bay is hot or the harness is flexed.
  • An open circuit in the actuator coil can read as a normal resistance if the break is intermittent, so a resistance check alone does not prove the actuator is good.
  • The powertrain control module driver can fail open after a shorted actuator, so replacing only the solenoid without checking the driver may lead to a repeat failure.
  • This code does not always mean the actuator is faulty; a poor ground or a shared power feed to other solenoids on the same circuit can set it as well.

Can I keep driving with P2B3C?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration and sustained high speeds because the engine may be stuck on the wrong cam profile and could enter limp-home mode. If the check engine light flashes or the engine runs very poorly, 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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