P2B47: B Camshaft Position Actuator Position Sensor B Circuit Bank 1

What it means

The position sensor B of the camshaft position actuator on the exhaust side of bank 1 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 exhaust camshaft actuator on bank 1 changes valve timing, and position sensor B reports its movement to the control module. This code identifies a fault in that sensor's circuit, making bank 1 exhaust cam position unreliable; it does not specify whether the circuit 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 1 exhaust cam position data for a missing, erratic, or implausible sensor B reading.
2. Locate sensor B at the bank 1 exhaust cam actuator and inspect its connector and wiring for loose pins, corrosion, oil intrusion, or physical damage.
3. Use the manufacturer's wiring information to check circuit connections and continuity before replacing parts.
4. Check the sensor's supply, ground, and signal at the connector following the manufacturer's procedure, since the code does not identify a 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 1 exhaust actuator sensor B connector.
• Repair damaged or open wiring in the sensor circuit.
• Replace sensor B if it fails the manufacturer's test with sound wiring.
• Clear the code and verify that bank 1 exhaust 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 sudden power loss makes continued driving unsafe.