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Service bulletin B121316

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 id10146709
Published by NHTSA2018-11-05
Manufacturer's numberB121316
Manufacturer's date2017-06-01
NHTSA componentELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING

NHTSA's summary

N63R Map Thermostat Faults. The Service Engine Soon light is on with one or more of the following fault codes: 1D2009 - characteristic map thermostat: clamped closed 10921B - characteristic map thermostat, stroke sensor: short circuit to ground 1D2008 - characteristic map thermostat: clamped open 1D2401 - characteristic map thermostat, actuation: short circuit to B+ 10921A - characteristic map thermostat, stroke sensor: short circuit to B+ 1FB201 - Check Control message (ID 257): Engine too hot! Drive gently 1FB301 - Check Control message (ID 39): Engine overheated. Stop carefully 1D2404 - characteristic map thermostat, actuation: line disconnection 1D2402 - characteristic map thermostat, actuation: short circuit to ground In severe cases there may be no communication with the DME (MASTER DME - control unit description file DME8FF_R) Coolant is leaking past the map thermostat electrical connector.

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, Engine

Vehicles listed
BMW 750LI2016

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