OBD-II Error Code B1306: How to Fix It

Medium 1-3 hours Low Severity Verified June 2026
Error Code
B1306
Brand
OBD-II Body
Product Type
automotive
Severity
Low
DIY Difficulty
Medium
Estimated Fix Time
1-3 hours
OBD-II error code B1306 indicates a problem with your vehicle's door lock cylinder switch showing an 'ajar input low' signal. This typically means the door lock mechanism isn't properly communicating with your car's computer system, often due to faulty wiring, a damaged switch, or connection issues.
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Tools You'll Need

How to Fix Error Code B1306

  1. Check the Error Code with OBD-II Scanner

    Ensure the vehicle is parked safely and the engine is off before connecting the scanner.
  2. Inspect Door Lock Cylinders Visually

  3. Test Door Lock Switch Operation

  4. Check Wiring Connections

    Disconnect the vehicle's battery before working on electrical components to prevent short circuits.
  5. Test Switch Continuity with Multimeter

    Ensure the battery is disconnected and follow proper multimeter safety procedures.
  6. Clean and Secure Connections

  7. Clear Codes and Test

Parts You May Need

Door lock cylinder switch
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Door lock actuator
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Electrical connectors
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Automotive electrical wire
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Door lock cylinder switch
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Door lock actuator
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Electrical connectors
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Automotive electrical wire
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Door lock cylinder switch
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Door lock actuator
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Electrical connectors
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Automotive electrical wire
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Door lock cylinder switch
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Door lock actuator
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Electrical connectors
Check Price on Amazon
Automotive electrical wire
Check Price on Amazon
Door lock cylinder switch
Check Price on Amazon
Door lock actuator
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive electrical wire
Check Price on Amazon
Door lock cylinder switch
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Door lock actuator
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive electrical wire
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When to Call a Professional

Call a professional automotive technician if you find damaged wiring inside the door that requires extensive repair, if the door lock actuator motor needs replacement, or if multiple electrical systems are affected. Also seek professional help if you're uncomfortable working with automotive electrical systems or removing door panels.

Frequently Asked Questions

What does OBD-II code B1306 mean?
OBD-II code B1306 indicates that the door lock cylinder switch is showing an 'ajar input low' signal, meaning there's a communication problem between the door lock mechanism and the vehicle's computer system.
Can I still drive my car with B1306 error code?
Yes, B1306 is a low-severity code that won't prevent you from driving. However, you may experience issues with power door locks not working properly, which could be a security concern.
How much does it cost to fix B1306 error code?
Repair costs typically range from $50-$300 depending on the cause. Simple wiring repairs may cost $50-$100, while replacing a door lock actuator can cost $150-$300 including labor.
Will B1306 cause my car to fail inspection?
B1306 typically won't cause an emissions inspection failure since it's related to body electronics, not engine emissions. However, local inspection requirements vary, so check with your inspection station.
How do I prevent B1306 from happening again?
Regular maintenance helps prevent B1306 recurrence. Keep door locks lubricated, protect electrical connections from moisture, and address any door lock issues promptly before they affect the electronic systems.