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AutoCodes - Generic - B1278

B1278 Code - Headlight Switch ON Position Circuit Malfunction

- Code Popularity: 8,045 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
By - Updated Mar 07, 2019
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|Code B1278 Possible Causes

  • Faulty Combination Headlight Switch
  • Combination Headlight Switch harness is open or shorted
  • Combination Headlight Switch circuit poor electrical connection
  • Faulty Multiplex Integrated Control Unit (MICU)

|How do I Fix the Code B1278?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your Car have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code B1278?

Labor: 1.0

The cost of diagnosing the B1278 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|What are Code B1278 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|Code B1278 Description

The Multiplex Integrated Control Unit (MICU) monitors the Headlight Switch Position. The MICU sets the OBDII code when the Headlight Switch Position is not to factory specifications.

OBDII Code B1278 - Headlight Switch ON Position Circuit Malfunction -
B1278 Code - Headlight Switch ON Position Circuit Malfunction

|Need More Information on the B1278 Code?

Need more information on how to fix the B1278 code? Get Access to Factory Service Manuals

|Information for Specific Makes

  • B1278 Acura Headlight Switch ON Position Circuit Malfunction
  • B1278 Honda Headlight Switch ON Position Circuit Malfunction

|Need Help with the B1278 Code?

Get the B1278 code diagnosed by a professional: Find a repair shop in your area

|Code B1278 comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the B1278 code? Have you replaced any parts?
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