What does code P1684 mean on Audi vehicles?
Communication error occurred during control unit programming.
OBD-II Code Audi
P1684 — Audi — Control Unit Programming Communication Error
Communication error occurred during control unit programming.
Common symptoms
- Control unit inoperative.
Possible causes
- Communication failure.
Initial recommendation
Retry control unit programming procedure.
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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