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Engine-Codes – Generic – B1387

B1387 Code - Oil Temperature Sensor Circuit Open

Quick Answer

The B1387 code indicates that there is an open circuit in the oil temperature sensor circuit. Common causes include Faulty oil temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or loose connections in the 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
B1387 indicates Oil Temperature Sensor Circuit Open.
Common causes
Common causes include Faulty oil temperature sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or loose connections in the 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 08, 2024
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Code B1387 Description

The B1387 code indicates that there is an open circuit in the oil temperature sensor circuit. The oil temperature sensor is responsible for monitoring the temperature of the engine oil, which is crucial for ensuring proper lubrication and engine performance. When the sensor detects an issue with the circuit, it can lead to inaccurate temperature readings or a complete failure to report any data to the engine control module.

OBDII Code B1387 - Oil Temperature Sensor Circuit Open
B1387 Code - Oil Temperature Sensor Circuit Open

Common Causes of B1387

  1. Faulty oil temperature sensor.
  2. Damaged wiring or connectors in the sensor circuit.
  3. Corrosion or loose connections in the circuit.
  4. Issues with the engine control module.
  5. Electrical issues such as a blown fuse or relay.

Symptoms of B1387

  1. Check engine light illuminated on the dashboard.
  2. Inaccurate readings on the oil temperature gauge.
  3. Engine overheating.
  4. Decreased fuel efficiency.
  5. Engine misfires or rough idling.

How to Fix B1387

  1. Begin by inspecting the wiring and connectors in the oil temperature sensor circuit for any damage or corrosion. Repair or replace any faulty components.
  2. Test the oil temperature sensor using a multimeter to determine if it is functioning correctly. Replace the sensor if necessary.
  3. Check the engine control module for any faults or errors related to the oil temperature sensor circuit. Reset or replace the module as needed.
  4. Clear the diagnostic trouble codes from the engine control module using a scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix B1387

The typical repair costs for addressing a B1387 code can vary depending on the specific cause of the issue. In general, replacing a faulty oil temperature sensor can range from $50 to $200, while addressing wiring or connector issues may cost around $100 to $300. Labor costs at auto repair shops can range from $80 to $150 per hour, so the total repair bill could amount to $200 to $500 or more. It's advisable to obtain quotes from local repair shops to get a more accurate estimate based on your vehicle's make and model.

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Code B1387 Information for Specific Makes

  • B1387 Hyundai — Driver Seat Track Position Sensor Short Or Short To Ground
  • B1387 KIA — Driver Seat Track Position Sensor Short Or Short To Ground
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.

Frequently Asked Questions about B1387 Code

1. What are the common symptoms of OBDII code B1387 (Oil Temperature Sensor Circuit Open)?

The common symptoms include issues with the oil temperature gauge reading inaccurately or not working at all, along with potential warning lights on the dashboard.

2. What causes OBDII code B1387 (Oil Temperature Sensor Circuit Open) to occur?

The code is typically triggered by a malfunction in the oil temperature sensor circuit, which can be caused by a faulty sensor, damaged wiring, or poor connections.

3. How can I diagnose OBDII code B1387 (Oil Temperature Sensor Circuit Open)?

Diagnosing this code involves using a scan tool to retrieve the code, checking the oil temperature sensor and its wiring for any visible damage, and testing the sensor's resistance.

4. Is it safe to drive with OBDII code B1387 (Oil Temperature Sensor Circuit Open) active?

It is generally safe to drive with this code, but it is recommended to address the issue promptly to ensure accurate monitoring of oil temperature for optimal engine performance.

5. Can I repair OBDII code B1387 (Oil Temperature Sensor Circuit Open) myself?

Depending on your comfort level with automotive repairs, you may be able to repair this issue yourself by replacing the oil temperature sensor or repairing any damaged wiring or connections.

6. How much does it cost to fix OBDII code B1387 (Oil Temperature Sensor Circuit Open) at a mechanic?

The cost of fixing this code at a mechanic can vary depending on the labor rates and parts needed, but it is usually a relatively affordable repair compared to other automotive issues.

7. Will resetting the OBDII codes make OBDII code B1387 (Oil Temperature Sensor Circuit Open) disappear?

Resetting the OBDII codes may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for a certain period.

8. Can a faulty oil temperature sensor cause other problems in the vehicle?

While a faulty oil temperature sensor may not directly cause major issues, it can affect engine performance and fuel efficiency if not functioning properly, leading to potential long-term damage if left unresolved.

9. How do I know if the oil temperature sensor needs to be replaced?

If the oil temperature gauge is not working, or if diagnostic tests reveal a fault in the oil temperature sensor circuit, it is likely that the sensor needs to be replaced to resolve the issue.

10. Are there any preventive measures to avoid OBDII code B1387 (Oil Temperature Sensor Circuit Open)?

To prevent this code from occurring, it is advisable to perform regular maintenance checks on the oil temperature sensor and its wiring, ensuring they are in good condition and free from damage.

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