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DTC codes / P2Bxx · Hybrid propulsion / P2B38

P2B38A Camshaft Profile Actuator B Control Circuit High Bank 2

P2B38 indicates that the powertrain control module (PCM) has detected a high-voltage condition on the control circuit for the Bank 2 camshaft profile actuator B. This actuator, often part of a variable valve timing or variable valve lift system, receives a command signal from the PCM to adjust camshaft profile, and the high circuit voltage suggests a short to power, an open circuit, or a faulty actuator.

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 performance or power, especially at higher RPMs
  • Rough idle or misfire under certain conditions
  • Decreased fuel economy
  • Engine may enter limp mode, limiting speed and RPM

Common causes, most likely first

  1. Faulty camshaft profile actuator B on Bank 2
  2. Damaged or shorted wiring in the actuator control circuit (short to power)
  3. Corroded or loose electrical connector at the actuator or PCM
  4. Failed PCM driver for the actuator control circuit
  5. Open circuit in the ground or power supply to the actuator
  6. Oil sludge or debris obstructing the actuator mechanism, causing abnormal current draw

How to diagnose and fix it

  1. Perform a visual inspection of the actuator, wiring, and connectors for damage, corrosion, or loose pins
  2. Use a scan tool to command the actuator on and off while monitoring circuit voltage to verify the fault
  3. Measure resistance and voltage on the control circuit to check for shorts to power or opens
  4. Swap the Bank 2 actuator with a known-good unit (if accessible) to see if the code follows
  5. Check for technical service bulletins (TSBs) or software updates for the PCM related to this code
  6. Repair or replace damaged wiring or connectors as needed
  7. Replace the camshaft profile actuator B if testing confirms it is faulty

Don't overlook the wiring harness

  • A short to power in the actuator control circuit is a common cause that many technicians miss when they replace the actuator without testing the harness.
  • The PCM may set this code intermittently if the actuator connector is loose or corroded, so always perform a wiggle test while monitoring live data.
  • Oil contamination or sludge can cause the actuator to draw excessive current, leading to a high circuit code, so check oil condition and maintenance history.
  • This code is often misdiagnosed as a simple actuator failure, but the root cause may be a chafed wire near the exhaust manifold or a faulty PCM driver.
  • Related codes such as P2B37 (low circuit) or other camshaft actuator codes may also be present, indicating a shared circuit issue.

Can I keep driving with P2B38?

Driving with this code is generally safe for short distances, but avoid aggressive acceleration or heavy loads because the engine may enter limp mode or suffer reduced performance. Have the vehicle diagnosed promptly to prevent potential catalytic converter damage from misfires.

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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