OBD-II Generic Error Code P0390: How to Fix It

Q: Can I drive my car with a P0390 code?

Short-distance driving at low speeds may be possible, but it is not recommended. A P0390 fault can cause poor engine performance, rough idling, stalling, and increased fuel consumption. In more severe cases, especially if the engine won't start or runs very roughly, driving is unsafe. Continuing to drive with a faulty camshaft position signal can also place extra strain on related components and potentially cause further damage.

Q: What is Bank 2 on my engine?

Bank 2 is the side of a V-shaped or horizontally-opposed (boxer) engine that does NOT contain cylinder number 1. In most V6 and V8 engines, Bank 1 is typically the front or driver's side bank, making Bank 2 the rear or passenger's side bank — but this varies by manufacturer and engine layout. Always verify Bank 2 location using your vehicle's specific service manual or a trusted repair database.

Q: What is the difference between P0385 and P0390?

Both codes relate to the Camshaft Position Sensor on Bank 2, but they reference different sensor positions. P0385 refers to Camshaft Position Sensor A on Bank 2 (typically the intake camshaft), while P0390 refers to Camshaft Position Sensor B on Bank 2 (typically the exhaust camshaft on engines with dual overhead cams). On single-cam engines, only one camshaft sensor exists per bank. The diagnostic and repair process is similar for both codes.

Q: How much does it cost to fix a P0390 code?

If the repair is just a camshaft position sensor replacement, the part typically costs between $20 and $80 for most common vehicles, and a shop will charge 30–60 minutes of labor on top of that, putting the total at roughly $80–$200. If the issue involves wiring harness repair, VVT solenoid replacement, or more complex internal diagnosis, costs can rise to $200–$600 or more depending on the vehicle and labor rates in your area.

Q: Can a bad camshaft position sensor cause a no-start condition?

Yes. The ECM relies on camshaft position sensor data to synchronize fuel injection and ignition timing. If the sensor signal is completely absent and the ECM cannot establish camshaft position, some vehicles will refuse to start or will start and immediately stall. If your vehicle cranks but won't fire, and you have a P0390 stored, the faulty sensor is a strong suspect and should be tested and replaced as part of the no-start diagnosis.

Abstract

The P0390 code indicates a fault in the Camshaft Position Sensor B circuit on Bank 2 of your engine — the side that does not contain cylinder #1. This sensor tells the engine control module (ECM) the exact position of the camshaft so it can fine-tune fuel injection and ignition timing. When this signal is missing or erratic, your engine may run poorly, stall, or refuse to start, and it's important to address it promptly to avoid further drivetrain damage.