P0385 Fault Code

Crankshaft Position Sensor B Circuit Malfunction

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

The P0385 fault code indicates a malfunction in the Crankshaft Position Sensor B circuit. This sensor plays a crucial role in the engine's timing and performance by monitoring the position and speed of the crankshaft. When the Engine Control Module (ECM) detects a problem with the signal from this sensor, it triggers the P0385 error code. Possible issues can vary from wiring problems to sensor failures.

What are the symptoms of the P0385 code?

Vehicles experiencing the P0385 code may exhibit the following symptoms:

• Check Engine Light illuminated on the dashboard
• Engine misfire or stalling
• Reduced engine performance and acceleration
• Difficulty starting the engine
• Irregular engine idle or inconsistency in engine speed.

What causes the P0385 code?

Common causes of the P0385 code include:

• Damaged or frayed wiring in the crankshaft position sensor circuit
• A faulty Crankshaft Position Sensor B
• Poor connections or corroded terminals
• Issues with the Engine Control Module (ECM)
• Misalignment or mechanical problems affecting the crankshaft sensor signal.

How to fix P0385?

To resolve the P0385 fault code, follow these steps:

1. Inspect the wiring and connectors associated with the Crankshaft Position Sensor B for damage, corrosion, or loose connections.
2. Use a multimeter to test the crankshaft position sensor for proper voltage and resistance, determining if it is functioning correctly.
3. Replace the Crankshaft Position Sensor B if it is found to be defective.
4. Clear the fault code using an OBD-II scanner and conduct a test drive to confirm the issue is resolved.
5. If the problem persists, further diagnosis may be needed to check the ECM and related components.