Immobilizer Antenna Ring Circuit
2000-2005 Mitsubishi Eclipse 3.0L V6
Description
Malfunction in the immobilizer antenna ring (transponder receiver coil) around the ignition lock cylinder or start button.
Symptoms
- Intermittent no-start
- Security light on
- Key sometimes not recognized
- Works with key held in specific position
Common Causes
- Faulty antenna ring coil
- Wiring damage from steering column work
- Connector loose
- Coil winding open or shorted
Diagnostic Steps
- Measure antenna ring resistance
- Inspect connector at steering column
- Check wiring from antenna to immobilizer module
- Test with oscilloscope for signal
Repair Notes
Replace immobilizer antenna ring. Ensure connector is fully seated after steering column work.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
- B0011Driver Side Airbag Deployment Circuit Open
B0103 on Other Vehicles
Mitsubishi 3000GT
1991-1999 3.0L V6
Mitsubishi 3000GT VR-4
1991-1999 3.0L Twin Turbo V6
Mitsubishi 3000GT VR-4
1991-1999 3.0L V6 Twin Turbo
Mitsubishi Colt JP
2002-2012 1.3L I4 4A90
Mitsubishi Colt JP
2002-2012 1.5L I4 4A91
Mitsubishi Delica D:5
2019-2025 2.2L I4 Turbo Diesel 4N14
Mitsubishi Diamante
1992-1996 3.0L V6
Mitsubishi Diamante
1997-2004 3.5L V6
Common Questions
What does code B0103 mean on a 2000-2005 Mitsubishi Eclipse?
B0103 stands for "Immobilizer Antenna Ring Circuit". Malfunction in the immobilizer antenna ring (transponder receiver coil) around the ignition lock cylinder or start button.
What are the symptoms of B0103 on a Mitsubishi Eclipse?
Common symptoms of B0103 include: Intermittent no-start, Security light on, Key sometimes not recognized, Works with key held in specific position.
What causes B0103 on a 2000-2005 Mitsubishi Eclipse?
Common causes of B0103 include: Faulty antenna ring coil, Wiring damage from steering column work, Connector loose, Coil winding open or shorted.