Faulty camshaft position actuator position sensor B on bank 2; Open or high-resistance wiring in the sensor signal circuit; Short to voltage on the sensor signal circuit; Corroded or damaged electrical connector at the sensor or PCM; Failed camshaft phaser or actuator mechanism causing the sensor to read out of range; PCM internal fault (rare, but possible after other causes are ruled out)

DTC codes / P2Bxx · Hybrid propulsion / P2B46

P2B46A Camshaft Position Actuator Position Sensor B Circuit High Bank 2

P2B46 indicates that the powertrain control module has detected an abnormally high voltage 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 a high voltage reading typically means the circuit is open, shorted to power, or the sensor's internal electronics have failed.

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, especially when cold
Reduced engine performance or poor fuel economy due to incorrect camshaft timing
Intermittent stalling or hesitation during acceleration
A noticeable decrease in power at higher engine speeds
Possible rattle or ticking noise from the timing chain area if the phaser is not controlling properly

Common causes, most likely first

Faulty camshaft position actuator position sensor B on bank 2
Open or high-resistance wiring in the sensor signal circuit
Short to voltage on the sensor signal circuit
Corroded or damaged electrical connector at the sensor or PCM
Failed camshaft phaser or actuator mechanism causing the sensor to read out of range
PCM internal fault (rare, but possible after other causes are ruled out)

How to diagnose and fix it

Perform a visual inspection of the sensor, connector, and wiring for damage or corrosion
Use a scan tool to check live data for the camshaft position actuator sensor B voltage and compare to specifications
Measure resistance and voltage on the sensor signal circuit to check for opens or shorts
Test the sensor with a multimeter or oscilloscope to verify its output matches camshaft movement
Replace the camshaft position actuator position sensor B if faulty
Repair or replace damaged wiring or connectors as needed
Clear the code and perform a road test to verify the repair, including a drive cycle to confirm the code does not return

Don't overlook the phaser or wiring

A high voltage code often points to an open circuit rather than a failed sensor, so inspect the wiring harness for breaks or chafing before replacing parts.
The camshaft position actuator position sensor B is sometimes confused with the camshaft position sensor itself; they are separate components with different functions and part numbers.
Oil sludge or debris can clog the oil control valve for the phaser, causing the actuator to stick and the sensor to report an implausible high voltage.
After replacing the sensor, the PCM may require a relearn procedure for the camshaft actuator to ensure proper timing control.
Intermittent high voltage readings can be caused by a loose ground connection at the engine block, which affects sensor reference voltage.

Can I keep driving with P2B46?

You can usually drive the vehicle with this code, but avoid aggressive acceleration or heavy loads because incorrect camshaft timing can reduce performance and may eventually damage the engine. Have the fault diagnosed soon to prevent worsening symptoms.

Tools that help

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