Code P0023 – Camshaft Position Actuator B Circuit (Bank 2)
Fault code P0023 is a generic powertrain code (OBD-II). It relates to a malfunction in the Variable Valve Timing (VVT) or Variable Camshaft Timing (VCT) actuator circuit on the “B” camshaft of bank 2. This issue affects the timing system and is managed by the engine control module (PCM or ECM).
Meaning of Code P0023
The PCM controls the Camshaft Position (CMP) actuator via a Pulse Width Modulation (PWM) control circuit and a feedback circuit. If the PCM detects an anomaly (open circuit, short to ground or voltage) in this system, it logs code P0023.
Camshaft “B” (Bank 2): Typically refers to the exhaust camshaft on the side of the engine that does not contain cylinder number 1.
Symptoms of Code P0023
- ⛌ Malfunction Indicator Lamp (MIL) illuminated
- 🔧 Engine malfunction (misfiring, rough idle)
- 📉 Decreased performance and fuel efficiency
- ⚙️ Engine stalling in severe cases
Possible Causes
- 🚫 Faulty Oil Control Valve (OCV)
- 🔌 Wiring issue (short circuit, open circuit, corroded connectors)
- 🛢️ Insufficient or poor-quality engine oil
- 🧠 Engine control module (PCM) failure
Diagnosis and Solutions
- Check engine oil level and condition: Dirty oil or low level can hinder VVT system operation.
- Inspect wiring and connectors: Use a multimeter to check for open circuits or short circuits between the OCV and PCM.
- Test the solenoid valve (OCV): Measure its resistance and compare it to manufacturer specifications. An out-of-range value indicates replacement is needed.
- Consult a specific repair manual: Exact procedures vary by make and model (Toyota, VW, Ford, etc.).
🔧 Tip: If you do not have the necessary tools or expertise, it is recommended to entrust the diagnosis to a qualified mechanic to avoid damaging other components.
Need help diagnosing your vehicle? Refer to our comprehensive guide or contact a licensed professional for an accurate diagnosis.