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B1600 B0xxx · 车身（B） 高严重度
Immobilizer / Key Transponder Communication Fault
The immobilizer cannot read a valid key transponder, so the engine is prevented from starting. A no-start code, not a running fault.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Engine cranks but will not start
- Key symbol or immobilizer lamp flashing
- Starts with the spare key
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Weak transponder key battery or damaged chip
- 2 Faulty antenna ring around the ignition
- 3 Immobilizer module fault
- 4 Recently replaced ECU not matched
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ Try the spare key first — that immediately separates key from vehicle fault.
- ✓ Check for aftermarket devices near the ignition (tag tolls, metal fobs).
- ✓ Read the immobilizer ECU for antenna and transponder status.
- ✓ Verify ECU/immobilizer matching after any module replacement.
维修方案
- Program or replace the key
- Replace the antenna ring
- Re-match the ECU and immobilizer
B1600 —— 常见问题
The spare key works — what is wrong? +
The first key's transponder or its housing. Replace and program it.
Can I bypass the immobilizer? +
Not legally or safely. Professional key programming is the correct fix.