Audi Q4 e-tron AC charging with restrictions

Audi Q4 e-tron AC charging with restrictions, what "limited" really means

You plug in expecting the usual 11 kW, and the car is clearly pulling less. Maybe it is taking far longer than normal overnight. Maybe the My Audi app shows a reduced charging rate. The car is not refusing to charge, which is reassuring, but something is clearly off, and that uncertainty is the most stressful part. Is it the car? The wallbox? The cable? A setting you forgot you changed?

In almost every reported case, the cause is one of three things, and you can check all three in about ten minutes.

The three usual reasons

  1. A current limit you set on purpose, and forgot about. The Q4 e-tron lets you cap AC charging current per location (for example, to protect a fragile domestic supply). If you ever set it to 10 A or 13 A and never changed it back, that is your ceiling.
  2. A wallbox that is throttling itself. Some wallboxes drop to single-phase or to a lower current when grid load is high, when the cable is too long, or when an installer-set limit is active.
  3. The car protecting itself. Cold battery, very hot battery, or a fault on one phase of the AC supply will all cause the car to derate. This is a feature, not a defect.

How to narrow it down

  1. Check the in-car limit first. MMI > Charging > Charging current (the exact path varies by model year). Set it to Maximum and confirm it stays that way after a key cycle.
  2. Test on a second charger if you can. Take the car to a different AC station on a different network. If the rate is normal there, the original wallbox or its installation is the bottleneck.
  3. Swap the cable. A worn or non-compliant portable cable can downgrade a 3-phase 16 A session to single-phase, or cap it at 13 A based on a bad PP signal. A Voldt® Audi Q4 e-tron Type 2 charging cable rated for 3-phase 22 A is a quick way to rule the cable out as the limiter.
  4. Note the conditions. Battery temperature below about 5°C or above about 40°C will reduce AC charging speed. So will a very low state of charge on a cold morning.

What the numbers should be

Most Q4 e-tron variants accept up to 11 kW AC on three phases at 16 A. The 35 e-tron is capped at 7.2 kW (also three phases, but lower current). On a single-phase 7 kW UK wallbox, expect roughly 7.2 kW. On a 3-phase 11 kW European wallbox, expect 11 kW. Anything lower than these, sustained, and not explained by battery temperature, points at one of the three causes above.

Bottom line

Check the in-car current limit, try a second charger, swap the cable, and look at temperature. If the rate is still reduced under clean conditions, that is the point at which a dealer should read the on-board charger's logs.