Skip the auto shop - Our mechanics make house calls

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

Check Engine Light

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...


Related questions

Q: MAF sensor

jeff engstrom

Q: What can be done if speakers showing and steering becomes different also the car would not go faster than ten mph? 2004 VW Polo

Hi there - I believe you mean the EPC warning light (electronic power control). This warning is similar to a Check Engine warning, and means something needs immediate attention in the engine/transmission systems. The inability to exceed 10 mph would...

Q: I get trouble code P2138, but I have cleared it and the car works for a while. Now I am getting trouble code P2127 along with P2138.

Hi there. The pedal position sensor on the gas pedal has lost signal for the switch 'E' and 'D'. The code P2138 means that the computer has discovered a malfunction with the pedal sensor. Check the harness to the...