B0402
Immobilizer Key Collation NG
B0402 is an OBD-II diagnostic trouble code meaning: Immobilizer Key Collation NG. Common causes: faulty key or its chip, damage to the immobilizer antenna. Estimated repair cost: $56–167.
Symptoms
- The car won't start
- The immobilizer indicator is flashing
- Engine stalls after starting
Causes
- Faulty key or its chip
- Damage to the immobilizer antenna
- Problems with the immobilizer control unit
- Wiring harness damage
- Software glitches
How to Fix
- Check the key for functionality (use a spare one)
- Diagnose the immobilizer antenna
- Check the immobilizer control unit
- Inspect the wiring harness for damage
- If necessary, reprogram the system
Related codes
Error B0402 by Vehicle Brand
FAQ
What does the B0402 code mean?
B0402 is an OBD-II diagnostic trouble code that indicates: Immobilizer Key Collation NG
What causes a B0402 error code?
The most common causes of B0402 include: Faulty key or its chip; Damage to the immobilizer antenna; Problems with the immobilizer control unit; Wiring harness damage.
How do I fix a B0402 diagnostic trouble code?
To fix B0402: Check the key for functionality (use a spare one). Diagnose the immobilizer antenna. Check the immobilizer control unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B0402?
Yes, but get it checked soon
How much does it cost to fix B0402?
The estimated repair cost for B0402 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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