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Service bulletin SSM73866

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10146145
Published by NHTSA2018-10-29
Manufacturer's numberSSM73866
Manufacturer's date2018-06-26
NHTSA componentELECTRICAL SYSTEM; EXTERIOR LIGHTING

NHTSA's summary

Issue: A Technician will find the following Diagnostic Trouble Code (DTC) relevant to catalyst system efficiency, P0420-00 stored in the Powertrain Control Module (PCM). The Malfunction Indicator Lamp (MIL) could also be illuminated. Affected vehicle vin ranges as follows ? Range Rover Sport (LW) AJ200P PHEV ? 146054 onwards. Range Rover (LG) AJ200P PHEV ? 343646 onwards

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Lighting

Trouble codes named

P0420

Vehicles listed
LAND ROVER RANGE ROVER2018
LAND ROVER RANGE ROVER SPORT2018

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20211022021-02-25. Lights And Instruments
21V1170002021-02-25. EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE; EXTERIOR LIGHTING:HEADLIGHTS

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
SSM76411 - 10MAR262026-04-06. Other. Smart Key Deactivated message on instrument cluster and unable to start their vehicle
TUCC_APR2025_182025-05-05. Other. Leaking windshield that caused the water ingress on the electrical component.
SFCC_OCT2024_502024-11-07. Other. The instrument panel may display an amber High Voltage (HV) system warning message & a Malfunction Indication Lamp (MIL) at the end of a charging cycle before the charging cable is removed.
SFCC_AUG2024_242024-09-06. Other. concern has been identified on certain JLR vehicles, where the Body Control Module (BCM) does not fully meet US importation requirements. The requires BCM replacement with a new component which fully meets the US importation requirements.
N808 ER v12024-03-08. Service bulletin. Certain 2017 to 2019 Land Rover vehicles equipped with TDV6 3.0L Diesel engines and Ingenium I4 2.0L Diesel engines, when connected to a diagnostic scan tool during the California SMOG test, the Powertrain Control Module (PCM) incorrectly reports the monitor readiness status as not supported.
SFCC_DEC2023_322024-01-09. Service bulletin. Due to time required to complete in shop vehicle set up and workflow for Audio loss, it has been found that workflow may provide false result if IMC is not in a faulted state when workflow is run to identify potential Polar Switch Firmware fault.
SFCC_NOV2023_302023-12-07. Service bulletin. Startup battery keeps draining / Vehicle will not start
SFCC_OCT2023_502023-11-06. Service bulletin. There is moisture inside the headlamp lens
WACCSEP23_62023-10-06. Service bulletin. Battery low warning displayed on instrument cluster and/or no-start
SSM758692023-09-08. Service bulletin. Coolant Low Warning Message Displayed On The Instrument Panel Cluster