# Service bulletin SSM74404

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: 10160432
- Published by NHTSA: 2019\-05\-28
- Manufacturer's number: SSM74404
- Manufacturer's date: 2019\-04\-30
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM

## NHTSA's summary

Degradation of the primary catalytic converter. The DTC P0420\-00 stored in the PCM indicates the primary catalyst is not operating at an optimal level.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10160432-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10160432-9999.pdf)

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

## Components

Engine, Exhaust and emissions

## Trouble codes named

P0420

## Vehicles listed

- 2016 LAND ROVER DISCOVERY
- 2017 to 2019 LAND ROVER DISCOVERY
- 2015 LAND ROVER DISCOVERY SPORT
- 2012 to 2019 LAND ROVER RANGE ROVER EVOQUE

## Recalls for the same vehicles and component

- [19V040000](/recalls/nhtsa/19V040000.md), 2019-01-17: ENGINE

## Other bulletins for the same vehicles and component

- [N861 Range Rover 21AUG26](/bulletins/11037143.md), 2026-09-08, Other: ENGINE. Mild Hybrid Electric Vehicle \(MHEV\) Battery Offline
- [TUCC\_FEB2026\_22](/bulletins/11029572.md), 2026-03-04, Other: ENGINE. GTDI BRAZED TURBOCHARGER CRACK EXTENDED WARRANTY
- [D085 \- 02FEB26](/bulletins/11029560.md), 2026-03-04, Service bulletin: ENGINE. GTDI Brazed Turbocharger Crack Extended Warranty
- [SSM76317ATT \- 28APR25](/bulletins/11017768.md), 2025-05-05, Other: ENGINE. Engine Will Crank, No Start When At Operating Temperature
- [SSM76317 \- 28APR25](/bulletins/11017767.md), 2025-05-05, Other: ENGINE. Engine Will Crank, No Start When At Operating Temperature
- [SSM76149](/bulletins/11010268.md), 2024-11-07, Other: ENGINE. Fuel Pump Driver Module Inoperative
- [BIG5MAR24\_34b](/bulletins/10252743.md), 2024-04-05, Service bulletin: FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:ENGINE:DIESEL; EQUIPMENT. A concern has been identified where on certain vehicles equipped with TDV6 3.0L Diesel 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'. A software update to the PCM is needed.
- [SFCC\_FEB2024\_35](/bulletins/10251430.md), 2024-03-06, Service bulletin: ENGINE AND ENGINE COOLING. After thermostat replacement, the instrument cluster says that the engine is overheating while driving.
- [NAS24.01.001](/bulletins/10249845.md), 2024-02-07, Service bulletin: ENGINE AND ENGINE COOLING. Potential manufacturing issue with replacement thermostats
- [BIG5JAN24\_27](/bulletins/10249844.md), 2024-02-07, Service bulletin: ENGINE AND ENGINE COOLING. POTENTIAL MANUFACTURING ISSUE WITH REPLACEMENT THERMOSTATS.

JSON: [/v1/bulletins/10160432](/v1/bulletins/10160432)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20SSM74404&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10160432&vehicle=Service%20bulletin%20SSM74404)