P0385
Crankshaft Position Sensor "B" Circuit Malfunction
Criticalsensor
Overview
The P0385 diagnostic trouble code means the PCM has identified a crankshaft position sensor "b" circuit malfunction problem. This code indicates that a sensor or its circuit is not providing expected readings to the engine management system. Faulty sensor data can cause the PCM to make incorrect adjustments, affecting engine performance.
Symptoms
- Reduced engine performance
- Check Engine Light (MIL) illuminated
- Erratic engine behavior
- Incorrect gauge readings
Common Causes
- Faulty PCM (Powertrain Control Module)
- Physical damage to sensor
- Poor ground connection for sensor
- Sensor contamination or buildup
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
- 2Locate the specific sensor referenced by the code
- 3Inspect the sensor connector for corrosion, damage, or loose pins
- 4Test the sensor output using a multimeter or scan tool live data
- 5Check the wiring between the sensor and the PCM for opens or shorts
Estimated Repair Cost
$75 — $350
Cost varies by vehicle, location, and repair shop. Includes parts and labor.
Commonly Affected Vehicles
Honda CivicNissan SentraKia ForteToyota Corolla
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LowFrequently Asked Questions
Most automotive sensors last 80,000-150,000 miles, though this varies by sensor type and driving conditions. Oxygen sensors and temperature sensors tend to degrade gradually over time.