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2021 Audi e-tron Slow Charging at Home and Public Stations

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Mike T. · rep 0 · May 26, 3:53 AM · 1 replies · solved · Question

Vehicle: 2021 Audi e-tron Premium

I'm having some frustrating issues with the charging speed on my 2021 Audi e-tron. I have a Level 2 charger installed at home (ClipperCreek 40A), and it used to charge perfectly fine. Now, it seems significantly slower, taking much longer than it should to get a full charge. I've also noticed this at public Level 2 stations.

It's not just Level 2; even at DC fast chargers, it feels like it's not hitting the speeds it used to. I've checked my home charger, and it seems to be working for other EVs. There are no warning lights on the dash, and the battery health indicator in the MMI seems normal.

Has anyone with an e-tron experienced a sudden drop in charging speed? Could this be a software issue, a problem with the car's charging port, or something else entirely? Any advice on what to check would be great.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:53 AM

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ClearTheCode admin answer:

Experiencing a sudden decrease in charging speed on your 2021 Audi e-tron can be concerning, as efficient charging is crucial for EV ownership. This issue can stem from various points within the charging ecosystem.

  1. Check Charging Settings: Double-check your e-tron's MMI charging settings. Ensure that you haven't accidentally set a lower charging current limit or enabled a 'low-power' or 'economy' charging mode. Also, verify that any scheduled charging times aren't interfering.
  2. Inspect Charging Cable and Port: Examine your charging cable for any signs of damage, fraying, or bent pins. Do the same for the vehicle's charging port. A damaged cable or a dirty/corroded port connection can reduce charging efficiency or cause intermittent issues.
  3. Monitor Battery Temperature: The e-tron's battery management system (BMS) will reduce charging speed if the battery is too cold or too hot to protect its longevity. While you mentioned no warnings, extremely cold weather can significantly impact charging rates, especially at DC fast chargers. Check the ambient temperature and if the car has been preconditioned.
  4. Home Charger (EVSE) Diagnostics: Although your home charger works for other EVs, it's worth ensuring it's operating at its full capacity. Some EVSEs have indicator lights for faults or reduced power output. If possible, try charging at a different reliable Level 2 source to rule out your home unit entirely.
  5. Software Glitch: Like any complex electronic system, the e-tron's charging control module (CCM) can sometimes experience software glitches that affect charging performance. A hard reset of the vehicle's infotainment system (as described in your manual) or a visit to the dealer for a software check might help.

When to See a Shop: If the issue persists across different chargers and after checking your vehicle's settings and cable, it's crucial to take your Audi e-tron to an authorized Audi service center. They have specialized diagnostic tools that can communicate directly with the car's battery management system (BMS) and charging control module (CCM). They can check for specific fault codes (e.g., P0D2A - Battery Charger Control Module Performance, P0AA6 - Hybrid Battery Voltage System Isolation Fault) that won't show up on a generic OBD-II scanner. The problem could be a faulty onboard charger, an issue with the high-voltage battery system, or a sensor malfunction within the charging circuit. Driving with a consistently slow charging rate indicates an underlying issue that needs professional diagnosis to prevent further damage or reduced battery life.

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