What does code P1604 mean on BMW vehicles?
The ECU detects an error during the speed monitoring self-test.
OBD-II Code BMW
P1604 — BMW — Control Module Self Test, Speed Monitoring
The ECU detects an error during the speed monitoring self-test.
Common symptoms
- Limp mode activation
Possible causes
- Internal ECU malfunction
Initial recommendation
Run advanced ECU diagnostics and evaluate control module integrity.
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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