B3120
Keyless Entry Antenna 2
B3120 is an OBD-II diagnostic trouble code meaning: Keyless Entry Antenna 2. Common causes: antenna damage, open or short circuit in wiring harness. Estimated repair cost: $56–167.
Symptoms
- The keyless entry system does not respond to the key fob
- Intermittent operation of the access system
- The malfunction indicator on the dashboard lights up
Causes
- Antenna damage
- Open or short circuit in wiring harness
- Access control unit malfunction
- Contact corrosion
How to Fix
- Check antenna integrity
- Check wiring harness for damage
- Check connections and contacts
- Replace the antenna if necessary
- Test the system after repair
Related codes
Error B3120 by Vehicle Brand
FAQ
What does the B3120 code mean?
B3120 is an OBD-II diagnostic trouble code that indicates: Keyless Entry Antenna 2
What causes a B3120 error code?
The most common causes of B3120 include: Antenna damage; Open or short circuit in wiring harness; Access control unit malfunction; Contact corrosion.
How do I fix a B3120 diagnostic trouble code?
To fix B3120: Check antenna integrity. Check wiring harness for damage. Check connections and contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3120?
Limited driving only, diagnose soon
How much does it cost to fix B3120?
The estimated repair cost for B3120 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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