# 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.

- Type: Service bulletin
- NHTSA id: 10146709
- Published by NHTSA: 2018\-11\-05
- Manufacturer's number: B121316
- Manufacturer's date: 2017\-06\-01
- NHTSA component: ELECTRICAL 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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10146709-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10146709-0001.pdf)

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

## Components

Electrical system, Engine

## Vehicles listed

- 2016 BMW 750LI

JSON: [/v1/bulletins/10146709](/v1/bulletins/10146709)

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