If your Land Rover, Range Rover or Jaguar mild hybrid shows an electrical fault warning, keeps flattening its 12V battery or suddenly loses drive, the 48V DC/DC converter is one of the first parts to check. This guide explains what the converter does, the symptoms owners report, how to check whether your car is covered by a recall, and what your options are if it is not.
What does the 48V DC/DC converter do?
MHEV models have two electrical systems: a 48V system for the mild hybrid starter-generator and battery, and the normal 12V system for lights, modules and the starter battery. The DC/DC converter transfers energy from the 48V side to keep the 12V system charged. When it stops working, the 12V battery is no longer charged properly – and everything that depends on 12V starts to fail.
Common symptoms
- Red "Stop Safely – Electrical Fault Detected" warning in the instrument cluster
- Further warnings appearing one after another if you keep driving
- 12V battery that goes flat or a car that will not start
- Intelligent stop/start not available
- In the worst case, loss of drive power – the car coasts to a stop – and later loss of exterior lights
The "Stop Safely" message and the loss of drive power are described in the official recall information published in the USA in 2026. If you see this warning, stop when it is safe and do not keep driving.
Fault codes often seen with converter faults
When we test cars and converters, the fault memory often contains codes such as P0A94 (DC/DC converter performance), P0D33, P0D22, P0A9E, P0D25, P0480, U0064, U3008 and U012A. A code alone does not prove the converter has failed – a weak 12V or 48V battery, a poor connection or a fuse can cause similar codes – so the unit should be tested before you buy a new one.
Is your car covered by a recall?
Check this first – it can save you the whole cost of repair.
- In April 2026 JLR announced a recall in the USA covering about 170,000 mild hybrid vehicles for DC/DC converter failure: Range Rover Sport 2019–2024, Defender 2020–2024, Range Rover 2020–2024, Discovery 2021–2024, Velar 2021–2024, Jaguar F-PACE 2021–2024, Evoque 2020–2023, Jaguar E-PACE 2021–2022 and Discovery Sport 2020.
- Earlier, in 2020, a software update campaign covered some Evoque L551 and Discovery Sport L550 converters in Europe.
Recalls differ by country and VIN. Ask a Land Rover dealer to check your VIN. If your car is covered, the dealer remedy is free. If it is not covered, or your warranty has ended, read on.
Your options if the converter has failed
New converter from a dealer – the most expensive option, often with a waiting time, and the new unit must be set up for your car.
Used converter – cheaper, but you do not know its history, and it may fail the same way.
Repair of your original converter – your unit is tested on the bench, the fault is confirmed, repaired and tested again. Because it is your original unit, it keeps its identity, which usually avoids the setup needed with a new or used part.
Check your part number before booking
Converter families include K8B2, K8D2, L8B2, L8D2, N8B2 and NK62. Repair or testing availability depends on the exact part number, hardware revision and fault. For N8B2-14B227-AC, AD and later versions in particular, please contact us with a photo of the label before sending your unit; we will confirm whether we can help.
How our repair works
- Order the bench test (£80) and post the converter to our lab in Rainworth, Nottinghamshire.
- We test it and send you a written report with a fixed repair price.
- You approve – the £80 is deducted from the repair (£630, 12-month warranty). You decline – we return the unit with the report.
- We will confirm the return delivery options and costs before you place your order.
Not sure the converter is the problem? Book vehicle diagnostics or message us on WhatsApp with the warning message and fault codes.
Sources
US recall information: NHTSA, TFLcar. European campaign 2020: ÖAMTC.