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DTC codes / P2Bxx · Hybrid propulsion / P2B43

P2B43A Camshaft Position Actuator Position Sensor B Circuit Bank 2

P2B43 indicates that the powertrain control module (PCM) has detected an abnormal electrical condition on the signal circuit for the bank 2 camshaft position actuator position sensor B. This sensor reports the actual position of the camshaft phaser, and the PCM sets the code when the voltage or signal behavior falls outside the expected range for the current operating conditions.

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 engine misfire, particularly when the camshaft phaser is commanded to change timing.
  • Reduced engine power or a limp-home mode triggered by the PCM to protect the engine.
  • Poor fuel economy or increased emissions due to incorrect camshaft timing.
  • Intermittent stalling or difficulty starting when the phaser position is misreported.
  • A noticeable rattle or ticking noise from the timing cover area if the phaser is not controlling properly.

Common causes, most likely first

  1. Faulty camshaft position actuator position sensor B on bank 2.
  2. Damaged or corroded wiring or connector at the sensor or PCM.
  3. Open or shorted signal circuit between the sensor and the PCM.
  4. Failed camshaft phaser or actuator that cannot achieve the commanded position.
  5. Low engine oil pressure or sludge buildup affecting phaser operation and sensor feedback.
  6. PCM internal fault on the sensor input circuit (rare).

How to diagnose and fix it

  1. Perform a visual inspection of the sensor, connector, and wiring for damage or corrosion.
  2. Check for related diagnostic trouble codes (DTCs) and freeze-frame data to confirm the fault conditions.
  3. Measure the sensor reference voltage and ground at the connector with a digital multimeter.
  4. Back-probe the signal circuit and compare the sensor output to the commanded phaser position using a scan tool.
  5. Test the camshaft phaser for mechanical freedom and verify engine oil condition and pressure.
  6. Replace the camshaft position actuator position sensor B if electrical tests indicate a failed sensor.
  7. Repair or replace damaged wiring or connectors, then clear codes and verify the repair with a road test.

Oil quality and phaser wear often mimic sensor faults

  • A dirty or sludged engine oil system can cause the camshaft phaser to stick, making the position sensor report an implausible value and setting P2B43 even when the sensor itself is good.
  • The sensor is a three-wire hall-effect or magnetoresistive type; a poor ground or reference voltage can skew the signal without completely failing, leading to intermittent codes.
  • Technicians sometimes replace the sensor only to find the phaser actuator or solenoid is the real culprit, so always command the phaser with a scan tool and watch the sensor feedback.
  • P2B43 is specific to bank 2 sensor B; on V6 or V8 engines, bank 2 is the side opposite cylinder 1, and misidentifying the bank can lead to replacing the wrong part.
  • A failing timing chain tensioner or worn chain can cause erratic camshaft timing that the sensor interprets as a circuit fault, so listen for chain rattle and check timing correlation.

Can I keep driving with P2B43?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration or towing because incorrect camshaft timing can cause engine damage or stalling. If the engine runs rough, misfires, or enters limp mode, stop driving and seek professional diagnosis.

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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