# Other TUCC\_APR2025\_23

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Other
- NHTSA id: 11017744
- Published by NHTSA: 2025\-05\-05
- Manufacturer's number: TUCC\_APR2025\_23
- Manufacturer's date: 2025\-04\-11
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

If there are stored codes, please run a workflow based on relevant symptom dropdowns. As the workflow is run, you will be prompted with a test plan titled “Startup Battery Test – Li\-ion.” Please run this test plan. If the test plan finds a fault, you will be granted AutoFRED approval and may proceed with repairs.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017744-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017744-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system

## Vehicles listed

- 2025 LAND ROVER DEFENDER
- 2022 to 2025 LAND ROVER RANGE ROVER
- 2023 to 2025 LAND ROVER RANGE ROVER SPORT

## Recalls for the same vehicles and component

- [26V599000](/recalls/nhtsa/26V599000.md), 2026-09-17: ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER
- [26V248000](/recalls/nhtsa/26V248000.md), 2026-04-17: ELECTRICAL SYSTEM:PROPULSION SYSTEM:DC/DC CONVERTER
- [23V568000](/recalls/nhtsa/23V568000.md), 2023-08-10: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY

## Other bulletins for the same vehicles and component

- [D100 Emission Recall](/bulletins/11038290.md), 2026-10-07, Emissions: ELECTRICAL SYSTEM. D100 Emission Recall Owner Letter
- [D101 Emission Recall](/bulletins/11038289.md), 2026-10-07, Emissions: ELECTRICAL SYSTEM. D101 Emission Recall Owner Letter
- [D103 Emission Recall](/bulletins/11038288.md), 2026-10-07, Emissions: ELECTRICAL SYSTEM. D103 Emission Recall Owner Letter
- [N955 Range Rover 21AUG26](/bulletins/11037148.md), 2026-09-08, Other: ELECTRICAL SYSTEM. A quality concern has been identified where there may be a missing fixing on the Mild Hybrid Electric Vehicle \(MHEV\) battery harness which is away from design specification.
- [SSM76110 \- 21AUG26](/bulletins/11037116.md), 2026-09-08, Other: ELECTRICAL SYSTEM. Vehicles on display e.g. in a showroom whilst being supported by a showroom 12v support unit, these vehicles require an additional fuse to be removed to prevent the MHEV \(48v\) battery draining and causing the cells to drop to a non recoverable level. Failure to follow this process will void the warranty cover on this battery.
- [SSM76110 \- 19AUG26](/bulletins/11037115.md), 2026-09-08, Other: ELECTRICAL SYSTEM. Vehicles on display e.g. in a showroom whilst being supported by a showroom 12v support unit, these vehicles require an additional fuse to be removed to prevent the MHEV \(48v\) battery draining and causing the cells to drop to a non recoverable level. Failure to follow this process will void the warranty cover on this battery.
- [N861 Range Rover 17JUL26](/bulletins/11035875.md), 2026-08-05, Other: ELECTRICAL SYSTEM. Mild Hybrid Electric Vehicle \(MHEV\) Battery Offline
- [N861 Range Rover 16JUN26](/bulletins/11034884.md), 2026-07-08, Other: ELECTRICAL SYSTEM. 48V Mild Hybrid Electric Vehicle \(MHEV\) battery enters an offline state and no longer communicates or functions as intended. This can result in illumination of the Malfunction Indicator Lamp \(MIL\) ,loss of start/stop functionality and no communication during diagnostic sessions.
- [N861 Range Rover 15MAY26](/bulletins/11033423.md), 2026-06-04, Other: ELECTRICAL SYSTEM. 48V Mild Hybrid Electric Vehicle \(MHEV\) battery enters an offline state and no longer communicates or functions as intended.
- [D103 \- 21MAY26](/bulletins/11033209.md), 2026-06-03, Service bulletin: ELECTRICAL SYSTEM. Due to inadequate penetration of welding between the cells, the battery’s capacity and therefore the vehicle’s electric range may be depleted below the design intent condition.

JSON: [/v1/bulletins/11017744](/v1/bulletins/11017744)

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