What is the P000B Code?
The error code P000B is a generic powertrain code indicating a slow response from camshaft position “B”, bank 1. It applies to vehicles equipped with a Variable Valve Timing (VVT) system. This issue affects brands such as Subaru, Dodge, VW, Audi, Jeep, GMC, Chevrolet, Saturn, Chrysler, Ford, etc.
VVT System Operation and Causes of the Fault
The VVT system optimizes performance and fuel consumption. The Powertrain Control Module (PCM) controls a solenoid that directs engine oil to adjust the camshaft position via an actuator. Code P000B is triggered when the actual camshaft position does not match the position desired by the PCM.
The designation “B” typically refers to the exhaust camshaft, and “bank 1” indicates the side of the engine where cylinder number 1 is located.
Severity and Symptoms
This fault is of moderate to severe severity and should be addressed promptly to avoid engine damage.
Common Symptoms:
- Check engine light illuminated
- Decreased engine performance
- Increased fuel consumption
- Abnormal noises from the engine
- Excessive pollutant emissions
Possible Causes of Code P000B
- Insufficient engine oil level or pressure
- Faulty Camshaft Position Sensor (CMP)
- VVT control solenoid stuck or clogged
- Damaged VVT actuator
- Timing chain issue (excessive slack, worn guides)
- Damaged electrical wiring or faulty connectors
- PCM failure (rare)
How to Diagnose Code P000B?
⚠️ Warning: These steps are general. Refer to the specific technical documentation for your vehicle for an accurate procedure.
1. Preliminary Checks
- Check the engine oil level and condition.
- Visually inspect the CMP sensor, VVT solenoid, and their wiring for damage or loose connections.
- Consult Technical Service Bulletins (TSB) for your model.
2. Camshaft Position Sensor (CMP) Test
Identify the sensor type (Hall effect or permanent magnet) and use a multimeter to measure its signal. A lack of fluctuating signal indicates a faulty sensor.
3. Sensor Circuit Test
Check the sensor circuit’s power supply (5V or 12V depending on type) and ground using a multimeter.
4. VVT Control Solenoid Test
- Measure its internal resistance and compare it to the manufacturer’s specifications.
- Inspect and clean the solenoid’s filter screen, often clogged with metal debris.
5. Solenoid Circuit Test
Verify that the solenoid receives 12V power and that its ground circuit is functional.
6. Mechanical Inspection
If electrical tests are conclusive, inspect the timing chain (tension, guide wear) and VVT actuators for any mechanical play or damage.
Conclusion and Call to Action
Code P000B is often related to an oil issue, faulty sensor, or solenoid. A methodical diagnosis is essential to avoid costly repairs.
Not comfortable performing these tests yourself? Leave the diagnosis to a professional. Use our online tool to get a personalized quote.