P0385 OBD-II Trouble Code: Crankshaft Position Sensor B Circuit Malfunction

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Cost of diagnosing the P0385 code

P0385 is a diagnostic trouble code (DTC) for "Crankshaft Position Sensor B Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate* Credit towards follow-up repair Earliest Availability
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BMW $164.99 $50.0

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P0385 code definition

P0385 OBD-II Trouble Code indicates that there is a malfunction in the crankshaft position sensor B circuit.

What the P0385 code means

The CKP, or crankshaft position sensor, measures the crankshaft location. It then sends this information to the Powertrain Control Module, or the CPM. This can be used in some vehicles to help time the spark properly. In other vehicles it is used only to detect misfires.

What causes the P0385 code?

The P0385 code could be caused by a number of different things including:

What are the symptoms of the P0385 code?

If the crank sensor is only used to detect misfires, and it doesn’t control the spark timing, the vehicle should still start. You will notice that you have your malfunction indicator light on though. Keep in mind that in some cases, it takes several cycles before this illuminates. If the crank sensor is also used for the spark timing in the vehicle, it means that the vehicle might not start at all. If it does start, it could run rough or misfire.

How does a mechanic diagnose the P0385 code?

To diagnose the P0385 code, the mechanic will use an OBM-II sensor and connect it to the vehicle. This will gather data from the vehicle. The mechanic will then reset the code and test drive the vehicle. If the code returns, and if they notice issues with the vehicle’s performance, they have a better idea of what the problem will be.

Common mistakes when diagnosing the P0385 code

One of the issues with diagnosing the P0385 code is not inspecting the timing components when replacing a broken timing belt. If the malfunction indicator light comes on and there is no noticeable difference in the vehicle’s performance right away, it could be possible to believe that it was only the sensor malfunctioning and not something that was actually wrong with the vehicle. Technicians should also remember to look for loose and corroded wiring and connectors, as this can cause the P0385 code as well.

How serious is the P0385 code?

When this light comes on, you will notice a difference in the performance of your vehicle. In some cases, you will not even be able to start the vehicle. As with any trouble codes in the vehicle, it is a good idea to have a professional mechanic check out the problem as soon as possible.

What repairs can fix the P0385 code?

After running the OBD-II scanner and testing the vehicle, the mechanic will then start to look at the possible causes of the problem in the vehicle. They will inspect the crankshaft gear, the position sensor, and sensor connectors to see if there is any damage if there is no RPM reading. The mechanic may need to replace the CKP sensor. They may also need to repair an open or a short in the wiring to the crank sensor. Once they’ve made repairs, they will reset the code and test the vehicle again to see if it solved the problem or not.

Additional comments for consideration regarding the P0385 code

Never ignore any of the OBD-II trouble codes that affect your vehicle. Even though it’s true that sometimes vehicles start to have issues with the sensors as they get older, it could actually be a problem with your vehicle. The best thing to do is to take the vehicle to a qualified mechanic. This helps you take better care of your vehicle so it can last longer.

Need help with a P0385 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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