U01AD: The high voltage battery interface control unit N is not answering on the car
The high voltage battery interface control unit N is not answering on the car network. It is usually that control unit, its power supply or the network wiring.
| Code | U01AD |
|---|---|
| System | Communication network |
| Group | U01xx, Lost communication with control units |
| Type | Generic: it means the same on every make |
How to read and clear U01AD with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see U01AD with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- U01A9 The high voltage battery interface control unit J is not answering on the car
- U01AA The high voltage battery interface control unit K is not answering on the car
- U01AB The high voltage battery interface control unit L is not answering on the car
- U01AC The high voltage battery interface control unit M is not answering on the car
- U01AE The high voltage battery interface control unit O is not answering on the car
- U01AF The high voltage battery interface control unit P is not answering on the car
- U01B0 The battery monitor module is not answering on the car network
- U01B4 The brake system control unit B is not answering on the car network
- U0100 Lost communication with engine control module (ECM/PCM A)
- U0101 Lost communication with transmission control module (TCM)
- U0102 Lost communication with transfer case control module
- U0103 Lost communication with the gear shift module
What does code U01AD mean?
The high voltage battery interface control unit N is not answering on the car network. It is usually that control unit, its power supply or the network wiring.
How do you clear U01AD?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, U01AD comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
