What does code P1748 mean on BMW vehicles?
The TCM reports a failure during its internal self-test.
OBD-II Code BMW
P1748 — BMW — Transmission Control Module Self Test
The TCM reports a failure during its internal self-test.
Common symptoms
- Limp mode activation
Possible causes
- Defective TCM
- internal hardware or software failure
Initial recommendation
Reprogram TCM if possible or replace 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.
Analyze this code with MecaOBD
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