# Service bulletin B661520

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: 10184592
- Published by NHTSA: 2020\-12\-21
- Manufacturer's number: B661520
- Manufacturer's date: 2020\-11\-01
- NHTSA component: VEHICLE SPEED CONTROL:CRUISE CONTROL

## NHTSA's summary

ACTIVE CRUISE CONTROL \- UNEXPECTED DECELERATION: Vehicle slows down \(decelerates\) unexpectedly while Active Cruise Control with Stop \& Go \(ACC\) function is activated.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184592-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10184592-9999.pdf)

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

## Components

Throttle and cruise control

## Vehicles listed

- 2021 BMW 330E
- 2019 to 2021 BMW 330I
- 2018 to 2021 BMW 530E
- 2017 to 2021 BMW 530I
- 2018 to 2019 BMW 540D
- 2020 BMW 540D
- 2017 to 2021 BMW 540I
- 2018 to 2019 BMW 640I
- 2020 BMW 640I
- 2017 to 2019 BMW 740E
- 2017 to 2021 BMW 740I
- 2016 to 2017 BMW 740LI
- 2020 BMW 745E
- 2018 to 2019 BMW 750I
- 2016 to 2019 BMW 750LI
- 2021 BMW 750LI
- 2020 to 2021 BMW 840I
- 2018 to 2021 BMW B7 ALPINA
- 2018 BMW C 400 X
- 2017 BMW F800 R
- 2020 to 2021 BMW M340I
- 2018 to 2021 BMW M5
- 2017 BMW M550I
- 2018 to 2021 BMW M550I
- 2017 to 2021 BMW M760I
- 2020 to 2021 BMW M8
- 2020 BMW M8 GRAN COUPE
- 2019 BMW M850I
- 2020 to 2021 BMW M850I
- 2019 BMW M850XI
- 2019 to 2021 BMW X5
- 2020 to 2021 BMW X6
- 2020 BMW X6 M
- 2019 to 2021 BMW X7

## Other bulletins for the same vehicles and component

- [B660523](/bulletins/10244242.md), 2023-11-01, Service bulletin: VEHICLE SPEED CONTROL; LANE DEPARTURE; FORWARD COLLISION AVOIDANCE. Various functions of the camera\-based driver assistance systems \(ADCAM system\) can lead to customer complaints.
- [B510520](/bulletins/10176369.md), 2020-06-15, Service bulletin: VEHICLE SPEED CONTROL. FUEL FILLER DOOR STICKING: The fuel filler door may be sticking requiring multiple attempts to open. The fuel filler door material can swell in wet conditions causing the filler door to stick.
- [B510820](/bulletins/10174012.md), 2020-04-20, Service bulletin: VEHICLE SPEED CONTROL; STRUCTURE:BODY:DOOR:HINGE AND ATTACHMENTS; BACK OVER PREVENTION. GROANING OR CRACKING NOISE WHEN OPENING OR CLOSING THE DOORS: A groaning or cracking sound is present when opening and/or closing any of the doors. Interference between the door panel and door.
- [B661117](/bulletins/10146771.md), 2018-11-05, Service bulletin: VEHICLE SPEED CONTROL:CRUISE CONTROL. ACC \(ACTIVE CRUISE CONTROL\): CANNOT DELETE FAULT CODE 022126. ACC fault code 022126 does not delete from ACC control unit fault code memory. May occur in combination with under\-voltage fault codes: \* BDC 0x80402F \- Battery deeply discharged \* BE6: 0x801405 \- Under\-voltage detected Insufficient control unit software.

JSON: [/v1/bulletins/10184592](/v1/bulletins/10184592)

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