AutoCodes – Generic – B1378

B1378 Code - Oil Change Lamp Circuit Short To Ground

Quick Answer

The Powertrain Control Module (PCM) monitors the Oil Change Lamp. Common causes include Faulty Oil Change Lamp, Oil Change Lamp harness is open or shorted, Oil Change Lamp 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: B1378 indicates Oil Change Lamp Circuit Short To Ground.
Common causes: Common causes include Faulty Oil Change Lamp, Oil Change Lamp harness is open or shorted, Oil Change Lamp 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 5,900

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 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1378 Description

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

OBDII Code B1378 - Oil Change Lamp Circuit Short To Ground - AutoCodes.com — B1378 Code - Oil Change Lamp Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B1378?

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

How to Fix the DTC B1378?

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 B1378 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 B1378 code?

Need more information on how to fix the B1378 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1378 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1378 Hyundai — Front-Driver Side Airbag Resistance Too High
B1378 KIA — Front-Driver Side Airbag Resistance Too High

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 B1378 Code

1. What are the common symptoms of OBDII code B1378 (Oil Change Lamp Circuit Short To Ground)?

- The common symptoms include the oil change lamp staying illuminated even after an oil change, flickering of the oil change lamp, or the lamp not turning on at all.

2. What are the possible causes of OBDII code B1378?

- The code B1378 may be caused by a short to ground in the oil change lamp circuit, a faulty oil change lamp switch, a wiring issue, or a defective instrument cluster.

3. How can I diagnose the cause of OBDII code B1378?

- You can diagnose the issue by inspecting the oil change lamp switch, checking the wiring for any damage or shorts, and using a multimeter to test for continuity and voltage in the circuit.

4. Can I continue driving my vehicle with OBDII code B1378?

- It is generally safe to continue driving your vehicle with this code, but it is recommended to address the issue promptly to ensure that you are reminded of oil change intervals.

5. How can I repair OBDII code B1378?

- The repair for code B1378 involves fixing the short to ground in the oil change lamp circuit, replacing the oil change lamp switch if faulty, repairing any damaged wiring, or replacing the instrument cluster if necessary.

6. Will resetting the OBDII code B1378 make the issue go away?

- Resetting the code may temporarily turn off the warning lamp, but if the underlying issue causing the code is not fixed, the code is likely to return.

7. How much does it typically cost to repair OBDII code B1378 at a repair shop?

- The cost of repair can vary depending on the specific cause of the code and the labor rates in your area. It is recommended to consult with a trusted mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code B1378 at home?

- Yes, if you have the necessary tools and experience with automotive electrical systems, you may be able to diagnose and repair code B1378 at home. However, if you are unsure, it is best to seek professional assistance.

9. Is OBDII code B1378 specific to certain vehicle makes or models?

- While code B1378 is related to the oil change lamp circuit, it can appear in various vehicle makes and models that are equipped with this type of warning system.

10. How often should I change my oil even if the oil change lamp is malfunctioning?

- It is recommended to follow the manufacturer's recommended oil change intervals, typically every 5,000 to 7,500 miles, even if the oil change lamp is malfunctioning to ensure the longevity of your engine.