P0387 Fault Code

Crankshaft Position Sensor B Circuit Low Input

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0387 fault code indicates a problem with the Crankshaft Position Sensor B circuit, specifically a low input signal. This sensor plays a crucial role in monitoring the position of the crankshaft, which is essential for engine timing and performance. A low input signal could mean that the sensor is malfunctioning, there is an issue in the wiring, or there is a fault in the engine control module (ECM).

What are the symptoms of the P0387 code?

• Engine misfires or runs rough
• Difficulty starting the engine
• Decreased engine performance
• Check Engine Light (CEL) illuminated
• Engine stalling or not running at all

What causes the P0387 code?

• Faulty Crankshaft Position Sensor B
• Damaged or corroded wiring in the sensor circuit
• Poor electrical connections
• Issues with the ECM
• Improper alignment of the crankshaft sensor

How to fix P0387?

• Inspect the Crankshaft Position Sensor B for damage and replace if necessary
• Check the wiring and connectors for any signs of wear, corrosion, or disconnection
• Ensure that the sensor is correctly aligned and installed
• Test the ECM to rule out any electronic control issues
• Clear the fault code and perform a road test to ensure the issue is resolved