E20
Audi
Firmware / Module Version Incompatibility
Audi EV charger shows E20 and the app indicates ‘Firmware mismatch’ or ‘Module version conflict’.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Main board and communication module running incompatible firmware versions, Interrupted update process, Installation of incorrect firmware image, Replacement board shipped with older firmware
How to Fix / Troubleshooting
Safety first: Firmware issues do not usually involve high-voltage work, but do not interrupt power during updates.
- Check firmware versions: In the Audi app or service interface, note the firmware versions of the main control board and any submodules (communication, HMI, load management).
- Perform complete update: Use the official update process to bring all modules to the latest compatible firmware. Ensure stable power and network during the update.
- Retry after failed update: If a previous update failed, follow Audi’s recovery procedure, which may involve a USB or wired service connection.
- Replace incompatible module: If a recently replaced board cannot be updated to a compatible version, it may be the wrong part number for your charger model. Replace it with the correct Audi-specified board.
Do not attempt to load unofficial firmware. Use only Audi-approved software and procedures.
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Repair Difficulty
Medium
3/5
Required Part
Firmware on Main Control and Communication Modules
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