What does code P1638 mean on Audi vehicles?
A required message from the clutch control module is missing on the powertrain data bus.
OBD-II Code Audi
P1638 — Audi — Data Bus Powertrain Missing Message from Clutch Control Module
A required message from the clutch control module is missing on the powertrain data bus.
Common symptoms
- Erratic gear changes.
Possible causes
- Communication error.
Initial recommendation
Diagnose clutch control communication.
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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