Audi e-tron charging issue that the workshop cannot reproduce

This one is genuinely frustrating. The car does something odd at home: the session ends early, the charge rate is wrong, an error message flashes and disappears. You book it in. The technician plugs in their diagnostic tool, runs the standard checks, and everything is fine. No fault codes, nothing in the log, no replication of the symptom.

You are not imagining it. Intermittent charging faults on the e-tron are real, and the workshop is not being dismissive: they are simply blind without evidence. Your job, before the next visit, is to collect that evidence.

Why the workshop sees nothing

The e-tron's diagnostic system only stores fault codes when a condition meets a specific threshold (duration, severity, repeat count). A brief glitch, especially one tied to a specific wallbox or a specific weather condition, may never reach that threshold. Some events are also stored as volatile codes that clear on the next ignition cycle. By the time the car reaches the service bay, the evidence is gone.

Build a fault diary

Every time it happens, capture as much of this as you can. The more complete the picture, the easier it is for the technician to match it to a known pattern.

• Date and time of the event.
• Location: home wallbox, public AC, public DC.
• Charger brand and model, plus the network if it is public.
• Outside temperature and weather (cold mornings and very hot afternoons matter).
• Battery state of charge at the start of the session.
• Cable used, including whether it is the OEM cable or a portable one.
• Exact wording of any message on the MMI or in the My Audi app.
• Whether the car was scheduled or charging immediately.

Capture it on video

A short phone clip of the dash and the cable head at the moment of failure is worth more than a paragraph of description. If a fault message appears even for a second, the video has it. Bring the clip with you to the dealer.

Keep your test setup consistent

If you swap chargers and cables every week trying to fix it yourself, the dealer cannot tell which variable mattered. Pick a clean baseline (one wallbox, one known-good cable such as a Voldt® Audi e-tron compatible charging cable) and only change one thing at a time. That way, when the symptom appears or disappears, you know why.

When you bring it in

Ask the technician specifically to read the charging history log, not only the live fault memory. On the e-tron, the on-board charger and the high-voltage battery management system keep their own session-level records, which sometimes contain the clue that the standard scan misses.

Bottom line

Intermittent faults are won by patience, not by guessing. Build a diary, capture video, keep the setup consistent, and bring it all to the next dealer visit. That is how an unreproducible issue becomes a fixable one.