B0402

Immobilizer Key Collation NG

Severity

🚨 Critical

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

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

B0400 B0401 B0403