B3121
Keyless Entry Antenna 3
B3121 is an OBD-II diagnostic trouble code meaning: Keyless Entry Antenna 3. Common causes: broken or damaged antenna wires, malfunction of the antenna itself. Estimated repair cost: $56–167.
Symptoms
- Reducing the range of the key fob
- Problems with unlocking/locking doors
- Sometimes the system stops working completely
Causes
- Broken or damaged antenna wires
- Malfunction of the antenna itself
- Wiring Harness Problems
- Today we will discuss some common issues related to B3121 and their solutions.
- Malfunctions of the keyless entry module
How to Fix
- Check the integrity of the antenna wires and contacts
- Test the antenna using diagnostic equipment
- Replace the antenna if a malfunction is detected
- Check the operation of the keyless entry module
Related codes
Error B3121 by Vehicle Brand
FAQ
What does the B3121 code mean?
B3121 is an OBD-II diagnostic trouble code that indicates: Keyless Entry Antenna 3
What causes a B3121 error code?
The most common causes of B3121 include: Broken or damaged antenna wires; Malfunction of the antenna itself; Wiring Harness Problems; Today we will discuss some common issues related to B3121 and their solutions..
How do I fix a B3121 diagnostic trouble code?
To fix B3121: Check the integrity of the antenna wires and contacts. Test the antenna using diagnostic equipment. Replace the antenna if a malfunction is detected. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3121?
Limited driving only, diagnose soon
How much does it cost to fix B3121?
The estimated repair cost for B3121 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat