P0387 Crankshaft Position Sensor B Circuit Range/Performance

When it comes to the functionality of a car, each component plays a vital role. One such component that is responsible for the smooth operation of the engine is the crankshaft position sensor.

The crankshaft position sensor is an electronic device that monitors the rotational speed and position of the crankshaft in an internal combustion engine. This information is crucial for the engine to operate efficiently and accurately.

However, like any other electronic component, the crankshaft position sensor can malfunction, causing various problems in the engine’s performance. One of the most common issues that arise from a faulty crankshaft position sensor is the P0387 fault code. This code indicates that there is a problem with the sensor’s circuit that is causing it to perform outside of its normal range. In this article, we will discuss the P0387 fault code in detail, its causes, symptoms, and how to resolve it.

What is the P0387 Fault Code?

The P0387 fault code is a diagnostic trouble code that indicates an issue with the crankshaft position sensor B circuit. This code is set when the Engine Control Module (ECM) detects that the sensor’s performance is outside of its normal range. In most cases, this code is accompanied by other fault codes related to the crankshaft position sensor.

Causes of P0387 Fault Code

There are several reasons why the P0387 fault code may be triggered. Here are some of the common causes:

1. Faulty Sensor: The most common reason behind the P0387 fault code is a faulty crankshaft position sensor. Over time, the sensor may become worn out or damaged, causing it to send incorrect signals to the ECM.
2. Corroded Connectors: Another reason for the P0387 fault code is corroded or damaged wiring connectors. Corrosion can cause poor connections between the sensor and the ECM, leading to an inaccurate reading.
3. Wiring Issues: Damaged or broken wiring can also cause the P0387 fault code. If the wiring is frayed or cut, it can prevent the sensor from transmitting the correct information to the ECM.
4. Failed ECM: A failed ECM can also trigger the P0387 fault code. In some cases, the ECM may not be able to correctly interpret the signals sent by the sensor, leading to an incorrect reading.

Symptoms of P0387 Fault Code

When the P0387 fault code is triggered, you may experience several symptoms. Here are some of the most common symptoms of the P0387 fault code:

1. Engine Misfiring: A faulty crankshaft position sensor can cause the engine to misfire, resulting in a rough idle and poor performance.
2. Reduced Power: The engine may experience a loss of power due to incorrect readings from the sensor.
3. Difficulty Starting: A damaged crankshaft position sensor can make it difficult for the engine to start, as the ECM may not receive the correct information about the crankshaft’s position.
4. Stalling: If the engine stalls suddenly, it could be due to a faulty crankshaft position sensor.

How to Fix the P0387 Fault Code

Fixing the P0387 fault code requires identifying the root cause of the issue. Here are some steps you can take to resolve the P0387 fault code:

1. Inspect the Sensor: The first step is to inspect the crankshaft position sensor for any signs of damage or wear. If the sensor is damaged, it needs to be replaced.
2. Check the Wiring: Inspect the wiring connectors and wiring harness for any signs of corrosion, damage, or breaks. Replace or repair any damaged wiring.
3. Check the ECM: If the sensor and wiring are in good condition, the ECM may be the culprit. A failed ECM can cause the P0387 fault code. In this case, you will need to replace the ECM.

Conclusion

The P0387 fault code is a common issue that can affect the performance of your vehicle. If you notice any of the symptoms discussed in this article, it’s essential to diagnose and resolve the issue promptly. By identifying the root cause of the P0387 fault code, you can take the necessary steps to fix the issue and prevent future problems.

FAQs

1. Can a faulty crankshaft position sensor cause engine damage?

Yes, a faulty crankshaft position sensor can cause engine damage if left unchecked. It can lead to incorrect fuel injection and timing, causing issues with the engine’s performance.

2. How much does it cost to replace a crankshaft position sensor?

The cost of replacing a crankshaft position sensor can vary depending on the make and model of your vehicle. On average, it can cost between $100 to $250.

3. How often should you replace the crankshaft position sensor?

The crankshaft position sensor does not have a set lifespan and does not require regular maintenance. However, if you notice any symptoms of a faulty sensor, it’s essential to have it inspected and replaced if necessary.

4. Can I drive my car with the P0387 fault code?

It’s not recommended to drive your car with the P0387 fault code. It can cause issues with the engine’s performance, leading to further damage if left unresolved.

5. How long does it take to fix the P0387 fault code?

The time it takes to fix the P0387 fault code can vary depending on the root cause of the issue. In most cases, it can take a couple of hours to a full day to resolve the issue.