Range Rover Autobiography (2018-2024) DC-DC Converter repair
Charging fault message displayed on the vehicle screen
12V system not being charged
The following fault code(s) may be present
P065B-16 - Generator Control Circuit Range/Performance – circuit voltage below threshold
Do you have a Range Rover with a suspected DC-DC converter fault or 12V charging failure?
Don't ignore it. Book an initial inspection today and get expert help.
Parts Repaired/Replaced
- DC-DC converter replaced, programmed and reset procedures completed
Affected Vehicles
Range Rover Autobiography 2021
- Range Rover Autobiography 2018
- Range Rover Autobiography 2019
- Range Rover Autobiography 2020
- Range Rover Autobiography 2021
- Range Rover Autobiography 2022
- Range Rover Autobiography 2023
- Range Rover Autobiography 2024
Common Failure Symptoms
- Charging fault warning displayed
- 12V battery not accepting charge
- Vehicle unable to maintain low-voltage electrical support
- DC-DC converter unable to support the 12V system under vehicle operating conditions
Land Rover Range Rover DC-DC Converter Diagnostic Report
Initially, the vehicle arrived with a suspected mild-hybrid 48V system fault. We confirmed the 12V system was not being charged, then followed testing, software updates and live data checks.
Further investigation showed the DC-DC converter could produce output with an external 48V supply, but it was unable to support the 12V system correctly when operating in the vehicle.
Land Rover Range Rover DC-DC Converter Repair
Subsequently, additional testing confirmed the 48V battery was not the root cause, and the vehicle still failed to charge the 12V system correctly. With wiring checks and supporting tests completed, the repair focus returned to the DC-DC converter as the cause of the low-voltage charging failure.
- Completed diagnostic checks and MHEV test plans
- Updated relevant vehicle controllers and carried out reset procedures
- Fitted, programmed and validated a new DC-DC converter
Resolution
Following the DC-DC converter repair, the new unit restored correct 12V charging support and resolved the low-voltage electrical issues. The original 48V battery was refitted once testing confirmed it was not the root cause, avoiding an unnecessary replacement and cost to the customer. With charging performance validated and the repair confirmed, the vehicle was reassembled and prepared for collection.
- The new DC-DC converter restored correct 12V charging support
- The original 48V battery was refitted, avoiding unnecessary replacement
- No replacement 48V battery was required for the completed repair
- The vehicle was reassembled and made ready for collection
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Is the vehicle owned by you or your business?
Have you been advised the battery or component needs replacing on your vehicle?
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Do LKQ Electriq repairs have a warranty?
High Voltage System Repairs
Repairs involving high voltage systems typically include a 12-month, unlimited mileage warranty, offering you complete peace of mind.*
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All work carried out at LKQ Electriq is backed by our lifetime workmanship guarantee.
*Terms and conditions apply. Please consult a Service Advisor to confirm the specific warranty details for your vehicle prior to booking.
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