P0390 Subaru Code - Camshaft Position Sensor 'B' Circuit Signal Fault Bank 2
Quick Answer
The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0390 Subaru indicates Camshaft Position Sensor 'B' Circuit Signal Fault Bank 2.
- Common causes
- Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position Sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0390 Subaru Description
When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.
When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.
What are the Possible Causes of the DTC P0390 Subaru?
- Faulty Camshaft Position Sensor
- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery
How to Fix the DTC P0390 Subaru?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0390 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0390 Subaru Code
1. What are common symptoms of OBDII code P0390 in a Subaru related to the Camshaft Position Sensor 'B' Circuit Signal Fault Bank 2?
- Common symptoms include rough idling, engine misfires, difficulty starting the vehicle, and a decrease in fuel efficiency.
2. What are the possible causes of OBDII code P0390 in a Subaru?
- The code P0390 in a Subaru is typically caused by a faulty camshaft position sensor, damaged wiring or connectors, or issues with the sensor's circuit.
3. How can I diagnose the Camshaft Position Sensor 'B' Circuit Signal Fault Bank 2 issue in my Subaru?
- Diagnosing the issue involves using an OBDII scanner to retrieve the fault code, visually inspecting the sensor and its connections, and performing electrical tests to determine the root cause.
4. Can I continue driving my Subaru with OBDII code P0390 present?
- It is not recommended to continue driving with the code present, as it can lead to further engine problems and potential damage if left unresolved.
5. How do I repair OBDII code P0390 in my Subaru?
- Repairing the code typically involves replacing the camshaft position sensor, repairing damaged wiring or connectors, and clearing the fault code with an OBDII scanner.
6. Are there any preventive measures to avoid OBDII code P0390 in a Subaru?
- Regular maintenance of the camshaft position sensor and its components, including cleaning and inspection during routine service intervals, can help prevent the occurrence of this fault code.
7. What are the consequences of ignoring OBDII code P0390 in a Subaru?
- Ignoring the code can lead to decreased engine performance, increased emissions, and potential damage to other engine components over time.
8. Can a DIY enthusiast repair OBDII code P0390 in a Subaru?
- Depending on their skill level, a DIY enthusiast may be able to replace the camshaft position sensor and address basic wiring issues associated with the fault code.
9. How long does it typically take to repair OBDII code P0390 in a Subaru?
- The repair time can vary depending on the extent of the issue, but replacing the camshaft position sensor and addressing related wiring problems usually takes a few hours.
10. Is it necessary to reset the ECU after repairing OBDII code P0390 in a Subaru?
- Yes, it is recommended to reset the ECU after repairing the issue to clear the fault code and ensure proper relearning of sensor parameters by the engine control module.
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