What does code P1855 mean on Audi vehicles?
The software versions used on the powertrain CAN data bus are incompatible, leading to communication conflicts between control modules.
OBD-II Code Audi
P1855 — Audi — Data-Bus Powertrain Software Version Control Incompatibility
The software versions used on the powertrain CAN data bus are incompatible, leading to communication conflicts between control modules.
Common symptoms
- Multiple system faults
- warning lights
Possible causes
- Incompatible or incorrect software versions
- incomplete updates
Initial recommendation
Update and synchronize all related control module software versions.
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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