Immobilizer Transponder Signal Not Detected
2007-2012 Nissan Altima 2.5L I4 🇨🇦
Description
The immobilizer system cannot detect the transponder signal from the key. The engine will not start.
Symptoms
- Engine cranks but will not start
- Security light flashing
- Key symbol on dashboard
- No-start condition
Common Causes
- Dead key battery (smart key)
- Faulty transponder chip in key
- Damaged antenna ring around ignition
- Interference from other transponder keys
- Key handle cracked exposing transponder to damage
Diagnostic Steps
- Try different registered key
- Hold key closer to ignition/start button
- Check for key battery (if applicable)
- Test antenna ring with known-good key
- Scan immobilizer codes
Repair Notes
Replace key battery or have new key programmed. Replace antenna ring if faulty.
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
B0101 on Other Vehicles
Nissan 200SX
1995-1998 1.6L I4 GA16DE
Nissan 200SX SE-R
1995-1998 2.0L I4 SR20DE
Nissan 240SX
1995-1998 2.4L I4 KA24DE
Nissan 300ZX
1990-1996 3.0L V6 VG30DE
Nissan 300ZX Twin Turbo
1990-1996 3.0L Twin-Turbo V6 VG30DETT
Nissan 350Z
2003-2006 3.5L V6 VQ35DE
Nissan 350Z
2007-2009 3.5L V6 VQ35HR
Nissan 370Z
2009-2020 3.7L V6 VQ37VHR
Common Questions
What does code B0101 mean on a 2007-2012 Nissan Altima?
B0101 stands for "Immobilizer Transponder Signal Not Detected". The immobilizer system cannot detect the transponder signal from the key. The engine will not start.
What are the symptoms of B0101 on a Nissan Altima?
Common symptoms of B0101 include: Engine cranks but will not start, Security light flashing, Key symbol on dashboard, No-start condition.
What causes B0101 on a 2007-2012 Nissan Altima?
Common causes of B0101 include: Dead key battery (smart key), Faulty transponder chip in key, Damaged antenna ring around ignition, Interference from other transponder keys, Key handle cracked exposing transponder to damage.