# Service bulletin N422NAS1

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: Service bulletin
- NHTSA id: 10174450
- Published by NHTSA: 2020\-05\-01
- Manufacturer's number: N422NAS1
- Manufacturer's date: 2020\-04\-01
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

A potential issue has been identified on certain Land Rover vehicles within the listed Affected Vehicle Range where the Traffic Sign Recognition \(TSR\) system may not operate as expected. TSR and Adaptive Speed Limiter are not supported on these vehicles without Navigation system. To correct this mis\-build condition and prevent these features, and Instrument Panel Cluster \(IPC\) displays, from not functioning correctly, a software update is required to remove the features, including selections in the IPC menus.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174450-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10174450-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2019 to 2020 LAND ROVER DISCOVERY

## Recalls for the same vehicles and component

- [23V393000](/recalls/nhtsa/23V393000.md), 2023-06-01: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; LATCHES/LOCKS/LINKAGES:DOORS:LATCH
- [2021381](/recalls/tc/2021381.md), 2021-06-17: Electrical
- [21V457000](/recalls/nhtsa/21V457000.md), 2021-06-17: ELECTRICAL SYSTEM:12V/24V/48V BATTERY
- [2020533](/recalls/tc/2020533.md), 2020-11-10: Electrical
- [20V694000](/recalls/nhtsa/20V694000.md), 2020-11-10: ELECTRICAL SYSTEM:12V/24V/48V BATTERY

## Other bulletins for the same vehicles and component

- [SSM76411 \- 10MAR26](/bulletins/11030751.md), 2026-04-06, Other: ELECTRICAL SYSTEM. Smart Key Deactivated message on instrument cluster and unable to start their vehicle
- [TUCC\_FEB2026\_35](/bulletins/11029600.md), 2026-03-04, Other: ELECTRICAL SYSTEM. There is a concern with the 48Volt charging system\(DC/DC\) with the vehicle.
- [TUCC\_FEB2026\_34](/bulletins/11029598.md), 2026-03-04, Other: ELECTRICAL SYSTEM. There is a concern/fault with the 48Volt MHEV system.
- [TUCC\_FEB2026\_33](/bulletins/11029576.md), 2026-03-04, Other: ELECTRICAL SYSTEM. 12V STARTUP BATTERY FLAT \- MILD HYBRID ELECTRIC VEHICLE \(MHEV\)
- [252602.027 \- 12FEB26](/bulletins/11029556.md), 2026-03-04, Service bulletin: ELECTRICAL SYSTEM. Once the vehicle is powered down via ignition cycle, it may not restart depending on remaining residual charge.
- [TUCC\_JAN2026\_25](/bulletins/11028601.md), 2026-02-06, Other: ELECTRICAL SYSTEM. There is a concern with the 48Volt charging system\(DC/DC\) with the vehicle.
- [TUCC\_DEC2025\_39](/bulletins/11027472.md), 2026-01-08, Other: ELECTRICAL SYSTEM. A battery warning light on and or electrical system failure message is displayed on instrument cluster.
- [Discovery\_N861\_20JUN25](/bulletins/11020386.md), 2025-07-08, Other: ELECTRICAL SYSTEM. Mild Hybrid Electric Vehicle \(MHEV\) Battery Offline
- [TUCC\_APR2025\_18](/bulletins/11017740.md), 2025-05-05, Other: ELECTRICAL SYSTEM. Leaking windshield that caused the water ingress on the electrical component.
- [SFCC\_MAR2025\_45](/bulletins/11016650.md), 2025-04-07, Other: ELECTRICAL SYSTEM. 'Stop Safely Electrical Fault Detected' warning message displayed in the message center.

JSON: [/v1/bulletins/10174450](/v1/bulletins/10174450)

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