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Service bulletin L-TT-0242-18

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 id10141593
Published by NHTSA2018-06-18
Manufacturer's numberL-TT-0242-18
Manufacturer's date2018-05-18
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

TT: In some cases, customers may report the engine coolant temperature gauge on the combination meter intermittently reading max hot, or "in the red zone," (Fig.1) on a vehicle with no other symptoms of overheating.

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

Engine

Vehicles listed
LEXUS ES HYBRID2016 to 2018
LEXUS ES3502016 to 2018
LEXUS RX HYBRID2016 to 2018
LEXUS RX3502016 to 2018

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