What does code P1602 mean on BMW vehicles?
The ECU detects a failure during its internal self-test indicating a defective control module.
OBD-II Code BMW
P1602 — BMW — Control Module Self Test, Control Module Defective
The ECU detects a failure during its internal self-test indicating a defective control module.
Common symptoms
- Persistent check engine light
Possible causes
- Defective ECU
- internal hardware failure
Initial recommendation
Reprogram ECU if possible or replace control module after confirmation.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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