AutoCodes – Generic – B1389

B1389 Code - Oil Temperature Sensor Circuit Failure

Quick Answer

The Powertrain Control Module (PCM) monitors the Oil Temperature Sensor. Common causes include Faulty Oil Temperature Sensor, Oil Temperature Sensor harness is open or shorted, Oil Temperature Sensor circuit poor electrical connection. 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: B1389 indicates Oil Temperature Sensor Circuit Failure.
Common causes: Common causes include Faulty Oil Temperature Sensor, Oil Temperature Sensor harness is open or shorted, Oil Temperature Sensor circuit poor electrical connection.
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.

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Code Popularity 8,996

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1389 Description

The Powertrain Control Module (PCM) monitors the Oil Temperature Sensor. The PCM sets the OBDII code when the Oil Temperature Sensor is not to factory specifications.

OBDII Code B1389 - Oil Temperature Sensor Circuit Failure - AutoCodes.com — B1389 Code - Oil Temperature Sensor Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1389?

Faulty Oil Temperature Sensor
Oil Temperature Sensor harness is open or shorted
Oil Temperature Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC B1389?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1389 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1389 code?

Need more information on how to fix the B1389 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1389 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1389 Hyundai — Driver Seat Track Position Sensor Defect
B1389 KIA — Driver Seat Track Position Sensor Defect

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 B1389 Code

1. What are common symptoms of OBDII code B1389 (Oil Temperature Sensor Circuit Failure)?

- Common symptoms include inaccurate oil temperature readings on the dashboard, illuminated oil temperature warning light, and potential engine performance issues.

2. What are the possible causes of OBDII code B1389?

- The code B1389 can be triggered by a faulty oil temperature sensor, damaged sensor wiring or connectors, a failed instrument cluster, or an issue with the vehicle's ECU.

3. How can I diagnose the cause of OBDII code B1389?

- To diagnose the issue, you can use a scan tool to read the trouble codes, inspect the oil temperature sensor and its wiring for damage, and perform tests to check the sensor's resistance and voltage.

4. Are there any simple repairs I can try to fix OBDII code B1389?

- You can start by checking and cleaning the sensor's electrical connections, replacing the oil temperature sensor if it is faulty, or repairing any damaged wiring or connectors in the sensor circuit.

5. Can OBDII code B1389 cause any long-term damage to the vehicle?

- While the code itself may not directly cause damage, ignoring the issue can lead to potential engine damage due to incorrect oil temperature readings and improper engine performance.

6. Is it safe to continue driving with OBDII code B1389 present?

- It is not recommended to drive with the code present, as inaccurate oil temperature readings can impact engine performance and potentially lead to engine damage if left unresolved.

7. How much does it typically cost to repair OBDII code B1389?

- The repair cost can vary depending on the exact cause of the issue, but it can range from a simple sensor replacement costing around $50 to more extensive repairs involving wiring or ECU issues costing several hundred dollars.

8. Can I reset OBDII code B1389 without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the root cause of the problem to prevent the code from reoccurring and ensure proper vehicle operation.

9. Will OBDII code B1389 cause my vehicle to fail an emissions test?

- Yes, if the code is present during an emissions test, it may cause your vehicle to fail as it indicates a malfunction in the oil temperature sensor circuit.

10. How can I prevent OBDII code B1389 from recurring in the future?

- Regularly inspecting and maintaining the oil temperature sensor, wiring, and connectors, as well as addressing any engine performance issues promptly, can help prevent the code from reoccurring.