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Engine-Codes – Generic – P0389

P0389 Code - Crankshaft Position Sensor 'B' Circuit Intermittent

Quick Answer

The P0389 diagnostic trouble code (DTC) refers to a potential issue with the Crankshaft Position Sensor 'B' circuit in a vehicle's engine. Common causes include Faulty crankshaft position sensor, Damaged or corroded wiring in the sensor circuit, Loose or poor connections in the sensor circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0389 indicates Crankshaft Position Sensor 'B' Circuit Intermittent.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged or corroded wiring in the sensor circuit, Loose or poor connections in the sensor circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0389 Description

The P0389 diagnostic trouble code (DTC) refers to a potential issue with the Crankshaft Position Sensor 'B' circuit in a vehicle's engine. The crankshaft position sensor is a crucial component that monitors the rotational speed and position of the crankshaft, providing essential data to the engine control module (ECM) for ignition timing and fuel injection. In this case, the 'B' circuit indicates a specific part of the sensor system that is experiencing intermittent connectivity problems.

OBDII Code P0389 - Crankshaft Position Sensor 'B' Circuit Intermittent
P0389 Code - Crankshaft Position Sensor 'B' Circuit Intermittent

Common Causes of P0389

  1. Faulty crankshaft position sensor
  2. Damaged or corroded wiring in the sensor circuit
  3. Loose or poor connections in the sensor circuit
  4. ECM malfunction or software issues
  5. Excessive wear on the sensor due to age or mileage

Symptoms of P0389

  1. Rough idling or engine stalling
  2. Misfiring or hesitation during acceleration
  3. Difficulty starting the engine
  4. Reduced fuel efficiency
  5. Illumination of the check engine light

How to Fix P0389

  1. Begin by conducting a thorough inspection of the crankshaft position sensor 'B' circuit, checking for any visible damage, corrosion, or loose connections.
  2. Test the sensor using a multimeter to ensure it is functioning correctly. Replace the sensor if it fails the test.
  3. Inspect the wiring harness for any signs of wear, damage, or corrosion. Repair or replace any faulty wiring as needed.
  4. Clear the DTC from the ECM memory using a diagnostic scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, consider consulting a professional mechanic for further diagnosis and potential ECM replacement.

Cost to Fix P0389

The typical repair costs for addressing a P0389 code can vary depending on the specific vehicle make and model, as well as the extent of the issue. In general, replacing a faulty crankshaft position sensor can cost between $50 and $200, while addressing wiring or connection issues may range from $100 to $300. Labor costs can add an additional $80 to $150 per hour, with total repair costs potentially exceeding $500 in some cases. It's advisable to obtain quotes from local auto repair shops to get a more accurate estimate based on your vehicle's needs.

What does this mean?

Tech Notes for P0389

Sometimes and in some models, low battery voltage or a weak starter can trigger a Crankshaft Position Sensor code. Before replacing any parts, recharge or replaced battery.

When is the Code Detected?

The crankshaft position sensor (POS) signal is sent to the Electronic Control Module (ECM) during the first few seconds of engine cranking is intermittent

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Code P0389 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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