U059B code meaning
Invalid Data Received From Hybrid/EV Battery Pack Sensor Module
What U059B means
The battery pack sensor module measures pack voltage and current and often sits in the switch box that holds the main contactors, reporting to the battery management controller. Audi uses U059B00 for an implausible signal from the high-voltage battery switch box on the 2024 Q8 e-tron family: after a stop at an AC charging point the car refused to enable its drive and the cluster asked the driver to stop safely, with contactor control codes P0ADC00 and P0AE000 stored alongside. Audi traced it to over-sensitive diagnostic software, advised a 20-minute bus sleep before towing and ruled out replacing parts. The 2025 Q5 e-tron shows U059B00 together with lost contact U029A00 (index entry only). CARB requires battery system faults that stop the pack moving the vehicle to be detected.
U059B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U059B
- Drive system cannot be activated
- Drive system and electrical system fault messages
- Charging interrupted
Common causes of U059B
- Most likelyOver-sensitive battery management software (Audi 2073482)
- PossibleCurrent or voltage sensing in the switch box faulty
- Less likelyBattery-internal communication line or connector disturbed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery sensor module
What each part of U059B means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 9B | The exact fault in that area. |
What to do next
- Note U059B 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 U059B
What does U059B mean?
U059B means "Invalid Data Received From Hybrid/EV Battery Pack Sensor Module". The battery pack sensor module measures pack voltage and current and often sits in the switch box that holds the main contactors, reporting to the battery management controller. It is a generic code, so it means the same on every make.
Is it safe to drive with U059B?
Drive gently and only to a workshop. With U059B the car can go into limp mode (reduced power) to protect itself.
Will U059B fail an emissions test?
U059B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U059B to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U059B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.