P2B43: A Camshaft Position Actuator Position Sensor B Circuit Bank 2

What it means

The position sensor B of the camshaft position actuator on the intake side of bank 2 reports a circuit condition. Cam phasing position cannot be measured reliably.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test
• The engine or gearbox may go into limp mode

How it works

The intake camshaft actuator on bank 2 changes valve timing, and position sensor B reports its movement to the control module. This code indicates a fault in that sensor's circuit, so the module cannot reliably measure the bank 2 intake cam position; the code description does not specify whether the signal is low or high.

Common causes

Most likely first.

1. Position sensor failed
2. Wiring or connector fault

Symptoms

• Check engine light on
• Power loss especially in mid-rpm range
• Possible rough idle or stalling
• Increased fuel consumption

How to diagnose it

1. Record freeze-frame data and inspect live bank 2 intake cam position data for a missing, erratic, or implausible sensor B reading.
2. Locate sensor B at the bank 2 intake cam actuator and inspect its connector and harness for loose pins, corrosion, oil intrusion, or damaged wiring.
3. Use the manufacturer's wiring information to check the sensor circuit connections and continuity before replacing parts.
4. Check the sensor's supply, ground, and signal at its connector using the manufacturer's procedure, since this code does not identify a specific low or high condition.
5. If the circuit checks out, test sensor B and compare its output with the manufacturer's specification.

Common fixes

• Reconnect, clean, or secure the bank 2 intake actuator sensor B connector.
• Repair damaged or open wiring in the sensor circuit.
• Replace sensor B if its output fails the manufacturer's test with sound wiring.
• Clear the code and verify that bank 2 intake cam position data is available and plausible.

Can I keep driving?

Drive only as needed and gently if the engine runs smoothly; reduced power, rough idle, or stalling may occur. Stop if stalling or power loss makes continued driving unsafe.