AutoCodes - OBDII Code List - B1278
B1278 - Headlight Switch ON Position Circuit Malfunction
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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 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.
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Cost of diagnosing the B1278 code
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.Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
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.
More Information
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
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