Error Code P0387: What It Means & What To Do?

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The trouble code P0387 can be defined as Crankshaft Position Sensor B Circuit Low Input. If a signal from the crankshaft position sensor B has been detected by the powertrain control module which is outside the normal variation which has been set by the automaker, then it would trigger the P0387 trouble code and it would result in the illumination of the check engine light.

When the circumstances are normal, then the crankshaft position sensor would record and transmit the speed at which the crankshaft is spinning and its present position to the powertrain control module. It would then allow the PCM to determine such functions as ignition timing and fuel delivery. If the circuit input for this sensor is extremely low, erratic or is outside the normal bounds by more than 10%, then the P0387 trouble code would be stored in.

What causes this problem with the Crankshaft Position Sensor B Circuit Low Input?

• There can be a short or opening in the crankshaft position sensor wiring harness or circuit
• Crankshaft position sensor might be defective
• Bad electrical connection to the crankshaft position sensor
• A damaged or defective starter motor or starting system circuit
• The signal plate might be damaged
• An undercharged or dead battery
• Crankshaft position sensor harness might be opened or shorted
• Flaws in the starter motor
• The car battery might be weak or dead

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2. Timing Belt - A broken Timing Belt can cause a lot of issues. It would be nice if you get it replaced on time.
3. Engine Control Module - Everything is fine with the Timing Belt and still OBD code P0387 flashing? Then there is definitely some fault with the Engine Control Module. Get it checked and replace if needed.
4. Crankshaft Position Sensor - Crankshaft Position Sensor is an important car part which should never be neglected. May be there is some fault in it due to which P0387 code may start flashing.
5. Powertrain Control Module - A faulty Powertrain Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Battery & Electrical System Parts - If everything is alright with PCM, then there is surely some defect in Battery & Electrical System Parts. Get it replaced before the situation gets worse.

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P0387 code by mentioning some major symptoms below:

Common Symptoms

• The car engine might start misfiring
• The acceleration can be choppy or uneven
• There can be lack or loss of power
• Engine stall
• Rough idling
• Decrease in the fuel efficiency
• The engine may not start
• The tachometer does not register RPM when the engine is cranked
• Hesitation upon acceleration
• The engine performance might be poor

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0387:

• You must repair or replace the wiring harness, wires, and connectors for the crankshaft position sensor circuit
• The defective or damaged crankshaft position sensor should be replaced
• It is very important to replace or replace the faulty starter motor
• Make sure that you repair replace the starting system circuit
• Replacing a damaged signal plate
• If the battery is weak or dead, then it should be recharged or replaced as per the need

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Here are some steps which you should follow in order to diagnose this fault code:

• An OBD-II scanner should be used by the mechanic to see that the P0387 code has been stored, as well as any other codes that may currently be stored by the PCM
• Before beginning diagnosis on the P0387 code issue, they will first address any codes that were stored before this code, as one of those could be the key to the problem
• After diagnosing and repairing each subsequent code, the mechanic should clear all codes and the system should then be retested
• If the P0387 code is not resolved after dealing with previous codes, then a visual inspection of the crankshaft position sensor, the crankshaft gear, and all relevant components, wiring, and connectors should be performed by the mechanic
• They should then work their way through the possible causes, this can be done by clearing the codes and retesting the system after each, until the problem is solved fully

Common Mistakes When Diagnosing The P0387 Code

• People might fail to inspect the wiring and connectors to and from the crankshaft position sensor and it would result in undiagnosed intermittent trouble
• There might be a loose connection or a wire that function intermittently, which would cause the code to be set when the connection is lost
• Make sure that you perform a proper inspection of all these components so that you do not face this issue