Audi A8 (4N) 48V Battery BMS 4N0915105F Crash Data Repair / Reset Service
Audi A8 (4N) 48V Battery BMS 4N0915105F Crash Data Repair / Reset Service
After a collision or airbag deployment, the 48V lithium mild-hybrid battery management system in the Audi A8 (4N) stores crash data internally — locking out the belt-starter-generator, triggering warning lights on the dash, and preventing normal mild-hybrid operation until a specialist clears it. TVC's nationwide mail-in crash data repair and reset service for the Audi A8 (4N) 48V BMS (4N0915105F) gets that unit cleared and returned to you in 3–5 working days, with free return shipping anywhere in the UK.
Quick Facts
| Service | Audi A8 (4N) 48V Battery BMS crash data repair / reset |
| Part number covered | 4N0915105F (check your unit label — TVC confirms before work starts) |
| What's included | Crash data identification, reset / repair, bench test, free tracked return |
| Turnaround | 3–5 working days from receipt |
| How to send | Remove unit, pack securely, send tracked to Office 13, 25 Mollison Avenue, Enfield, EN3 7NJ |
| Contact | 0203 489 2610 — thevehiclecheck.co.uk |
What actually happens when crash data locks the Audi A8 (4N) 48V BMS?
The 48V mild-hybrid system in the Audi A8 (4N) uses a lithium-ion battery pack managed by a dedicated BMS (Battery Management System). When the vehicle detects a crash event — even a minor one that deploys the airbags — the BMS writes a crash record into its internal memory as a safety lockout. Once that data is present, the BMS refuses to re-enable the belt-starter-generator. You'll typically see one or more warning lights related to the 48V system, the start-stop function drops out, and in some cases the mild-hybrid assistance is completely absent. A standard diagnostic reset with an OBD tool is not enough to clear it — the crash record sits at a deeper level inside the BMS and requires specialist access to remove cleanly.
The unit part number for this service is 4N0915105F. That said, part numbers on these units can vary by build date and market specification, so always check the label on your own unit directly. TVC will verify the number matches before any work begins — if there's any doubt, a quick call or message is all it takes.
Is mailing your BMS unit to TVC really better than going to an Audi dealer?
| Option | Audi Main Dealer | TVC Mail-In |
|---|---|---|
| Typical solution offered | Replace the 48V battery assembly | Crash data reset — same unit returned |
| Vehicle off road | Days to weeks (parts availability) | 3–5 working days from TVC receiving the unit |
| Need to attend in person | Yes | No — post from anywhere in the UK (or internationally) |
| Return shipping | N/A | Free tracked return included |
Audi main dealers routinely recommend replacing the entire 48V battery assembly when crash data is present — it's the path of least resistance for them. That's an expensive route for a fault that is, in most cases, resolvable at the BMS level without replacing the hardware at all. TVC focuses specifically on 48V crash data at the electronics level, which is why this service exists as a standalone option.
How do you safely pack and send the Audi A8 (4N) 48V BMS unit?
Getting the unit to TVC safely is straightforward — but a little care at the packing stage protects your module in transit and avoids any delays.
- Remove the unit from the vehicle before packing. Do not send the whole battery assembly — the BMS module is the part TVC needs.
- Wrap in bubble wrap — two full layers minimum, paying attention to any connectors or exposed pins. Cover connectors with masking tape to protect the contacts.
- Box it securely. Use a corrugated cardboard box that fits the unit with at least 3–4 cm of packing material (foam, more bubble wrap or packing peanuts) on all sides. Avoid rattling room inside the box.
- Include your name, return address and contact number on a note inside the box, plus the vehicle's registration if it's available — this helps TVC match your unit quickly on arrival.
- Use a tracked courier service. Royal Mail Tracked 48, DPD, Parcelforce or similar — keep your tracking number until the unit is back with you.
- Send to: Office 13, 25 Mollison Avenue, Enfield, EN3 7NJ.
TVC returns the repaired unit via free tracked delivery, so there's nothing extra to arrange on the return leg.
Who carries out this work, and what's their background?
The Vehicle Check is a UK automotive electronics specialist with hands-on experience across a wide range of modern vehicle systems — from DSG and 9G-Tronic mechatronic units to SRS airbag modules, 48V battery systems and BCM/BSI cloning. The workshop handles units from across the UK and internationally, bench-testing every module before it leaves. The team works directly with the hardware rather than outsourcing, which means consistent standards and direct communication if any question arises about your specific unit. You can explore related services — including crash data reset and repair across other platforms, mechatronic repair and cloning, BCM, BSI and FRM services, and clutch actuator repair — across the full TVC collection.
Frequently Asked Questions
Ready to send your Audi A8 (4N) 48V BMS unit?
Order the Audi A8 (4N) 48V Battery BMS 4N0915105F crash data repair / reset service directly on the TVC store, or call the team on 0203 489 2610 if you'd like to talk through the fault before sending. TVC accepts units from across the UK and internationally — pack it safely, send it tracked to Office 13, 25 Mollison Avenue, Enfield, EN3 7NJ, and your unit will be back with you within 3–5 working days, return shipping included.
The Vehicle Check is a UK automotive electronics specialist at Office 13, 25 Mollison Avenue, Enfield, EN3 7NJ, offering nationwide and international mail-in repair and cloning. Call 0203 489 2610. Last updated: 10 November 2026.
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