WenmarOpen by Wenmar Pro

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10184592
Published by NHTSA2020-12-21
Manufacturer's numberB661520
Manufacturer's date2020-11-01
NHTSA componentVEHICLE 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

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

Throttle and cruise control

Vehicles listed
BMW 330E2021
BMW 330I2019, 2020, 2021
BMW 530E2018, 2019, 2020, 2021
BMW 530I2017, 2018, 2019, 2020, 2021
BMW 540D2018, 2019
BMW 540D2020
BMW 540I2017, 2018, 2019, 2020, 2021
BMW 640I2018, 2019
BMW 640I2020
BMW 740E2017, 2018, 2019
BMW 740I2017, 2018, 2019, 2020, 2021
BMW 740LI2016 to 2017
BMW 745E2020
BMW 750I2018, 2019
BMW 750LI2016 to 2019
BMW 750LI2021
BMW 840I2020, 2021
BMW B7 ALPINA2018 to 2021
BMW C 400 X2018
BMW F800 R2017
BMW M340I2020, 2021
BMW M52018, 2019, 2020, 2021
BMW M550I2017
BMW M550I2018, 2019, 2020, 2021
BMW M760I2017, 2018, 2019, 2020, 2021
BMW M82020, 2021
BMW M8 GRAN COUPE2020
BMW M850I2019
BMW M850I2020, 2021
BMW M850XI2019
BMW X52019, 2020, 2021
BMW X62020, 2021
BMW X6 M2020
BMW X72019, 2020, 2021

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

Other bulletins for the same vehicles and component
B6605232023-11-01. Service bulletin. Various functions of the camera-based driver assistance systems (ADCAM system) can lead to customer complaints.
B5105202020-06-15. Service bulletin. 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.
B5108202020-04-20. Service bulletin. 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.
B6611172018-11-05. Service bulletin. 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.