P2C19: B Camshaft Profile Actuator Position Sensor B Circuit High Bank 1

What it means

The control module detects a high signal from camshaft profile actuator position sensor B on bank 1. The signal does not reliably indicate the actuator’s position.

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 B camshaft profile actuator changes the cam profile, and sensor B on bank 1 reports its position to the control module. This code sets when the sensor B circuit voltage is above the expected level, making its position signal unreliable.

Common causes

Most likely first.

1. Signal wire shorted to B+
2. Open position sensor
3. Connector pins corroded - high contact resistance

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. Capture freeze-frame data and watch live bank 1 sensor B data to see whether the high signal is constant or intermittent.
2. Inspect sensor B’s connector and wiring for corroded or loose pins, broken conductors, and damage that could leave the circuit open.
3. Check the signal wire for a short to battery voltage or another high-voltage circuit using the manufacturer’s isolation procedure.
4. Test sensor B’s supply, ground, signal continuity, and connector contacts against vehicle service information.
5. If the circuit checks out, test sensor B for an internal open and verify the bank 1 actuator moves correctly.

Common fixes

• Secure the sensor B connector and clean or repair corroded or loose terminals.
• Repair a signal wire shorted to battery voltage or an open in the bank 1 sensor B circuit.
• Replace sensor B if it is internally open or remains high with a sound circuit.
• Repair the bank 1 actuator if testing separately finds it is sticking or worn.

Can I keep driving?

Drive only as needed and avoid hard acceleration; the high bank 1 sensor B signal can lead to reduced power, rough running, or stalling. Stop safely if the engine begins to stall or loses substantial power.