U04AE code meaning
Invalid Data Received From Hybrid/EV Battery Interface Control Module N
Network system Generic code U04xx codes Check engine light
What U04AE means
U04AE stands for invalid data from interface module N, the fourteenth. Like the other high letters it can only appear on a large pack, and no manufacturer documents it publicly. What changes for the workshop is mostly practical: the board sits inside the sealed high-voltage battery, so after reading the freeze-frame data and ruling out the 12 V supply and the low-voltage connectors outside the pack, every further step means de-energising the system, measuring isolation and opening the housing, a job for trained staff with the maker's tester. Polestar, for example, bills a high-voltage battery disconnect with insulation measurement as a labour step of its own when a high-voltage part is replaced. U01AD means module N is silent, U0347 a software conflict.
U04AE at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor2 to 12 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U04AE
- Battery or EV system warning
- Output and charging power limited
Common causes of U04AE
- Possible12 V supply or low-voltage plug of the pack at fault (check first)
- PossibleInterface control module N faulty
- PossibleContact fault on the internal link to module N
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery interface module n
What each part of U04AE means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| AE | The exact fault in that area. |
What to do next
- Note U04AE and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U04AE
What does U04AE mean?
U04AE means "Invalid Data Received From Hybrid/EV Battery Interface Control Module N". U04AE stands for invalid data from interface module N, the fourteenth. It is a generic code, so it means the same on every make.
Is it safe to drive with U04AE?
Drive gently and only to a workshop. With U04AE the car can go into limp mode (reduced power) to protect itself.
Will U04AE fail an emissions test?
Yes, it can. U04AE is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U04AE to fix?
Difficulty: workshop only. A typical repair takes 2 to 12 hours of work. This is a job for a workshop.
Will U04AE clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.