# Service bulletin B120420

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: 10172489
- Published by NHTSA: 2020\-03\-16
- Manufacturer's number: B120420
- Manufacturer's date: 2020\-02\-01
- NHTSA component: EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM

## NHTSA's summary

MIL LIGHT ILLUMINATED AT LOW AMBIENT TEMPERATURES. After engine start the malfunction indicator lamp \(MIL\) and Check Control message \(ID 29\) "Engine fault\! Power loss" are displayed in the instrument cluster. In addition The following fault codes are stored in the Digital Motor Electronics \(DME\) Engine runs in failsafe mode Engine cannot exceed 800 \- 1200 RPMs.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10172489-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10172489-9999.pdf)

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

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- 2020 BMW M2
- 2020 BMW R 1250 GS ADVENTURE
- 2016 to 2020 BMW X1
- 2016 to 2017 BMW X1 SAV
- 2018 to 2020 BMW X2

## Other bulletins for the same vehicles and component

- [B840226](/bulletins/11035408.md), 2026-07-31, Service campaign: ELECTRICAL SYSTEM. Once the Telematics Module \(TCB2\) enters sleep mode, a BMW Data Services trigger for Remote Services\(remote engine start, lock/unlock/climate conditioning\) will not be able to reactivate the TCB2. Due to this issue, Remote Services will not function in the vehicle when parked and locked.
- [B011924](/bulletins/11013038.md), 2025-01-23, Warranty extension: ELECTRICAL SYSTEM. The Telematics Control Units \(TCU\) Internal Emergency \(Backup\) Battery for defects in materials and/or workmanship has been extended to 6 years without mileage limitation, as determined from the vehicles original first in\-service / delivery date. This coverage is subject to the same vehicle eligibility requirements, limitations, and exclusions that apply to the BMW New Vehicle Limited Warranty.
- [B011624](/bulletins/11013037.md), 2025-01-23, Warranty extension: ELECTRICAL SYSTEM. The Telematics Control Units \(TCU\) Internal Emergency \(Backup\) Battery for defects in materials and/or workmanship has been extended to 6 years without mileage limitation, as determined from the vehicles original first in\-service / delivery date. This coverage is subject to the same vehicle eligibility requirements, limitations, and exclusions that apply to the BMW New Vehicle Limited Warranty.
- [B01192024](/bulletins/11012113.md), 2025-01-02, Warranty extension: ELECTRICAL SYSTEM. The Telematics Control Units \(TCU\) Internal Emergency \(Backup\) Battery for defects in materials and/or workmanship has been extended to 6 years without mileage limitation, as determined from the vehicles original first in\-service / delivery date.
- [B011824](/bulletins/11012111.md), 2025-01-02, Warranty extension: ELECTRICAL SYSTEM. The Telematics Control Units \(TCU\) Internal Emergency \(Backup\) Battery for defects in materials and/or workmanship has been extended to 6 years without mileage limitation, as determined from the vehicles original first in\-service / delivery date.
- [B840324](/bulletins/11009005.md), 2024-10-19, Service bulletin: ELECTRICAL SYSTEM. The “End of life” or “Emergency call system error” Check Control message appears in the vehicle. The following fault memory entry is stored: B7F341 – Emergency battery: Hardware faulty
- [B611124](/bulletins/10252135.md), 2024-04-01, Service bulletin: ELECTRICAL SYSTEM. After performing a BMW Remote Software Upgrade \(RSU\), the functionality of the Comfort Access andPassive Go/Exit features may be reduced. Also, one or more of the following error memory entries below may be stored in the Basic Central Platform\(BCP\) module. 80424A Remote control receiver at the front \(FBD5 VM\): Programming defective 80424B Remote control receiver at the rear \(FBD5 HM\): Programming defective 80424C Remote control receiver at the front left \(FBD5s VL\): Programming defective 80424D Remote control receiver at the front right \(FBD5s VR\): Programming defective 80424E Remote control receiver at the rear right \(FBD5s HR\): Programming defective 80424F Remote control receiver at the rear left \(FBD5s HL\): Programming defective
- [B611305](/bulletins/10249027.md), 2024-02-01, Service bulletin: ELECTRICAL SYSTEM. The electrical system of BMW vehicles has been subject to an ongoing development process over the last few years. This has led to increased demands being placed on the battery. This document covers important information for the dealer on how to handle “discharged battery” complaints.
- [B521723](/bulletins/10249023.md), 2024-02-01, Service bulletin: ELECTRICAL SYSTEM; SEATS. Customer states one of the front seats is inoperative. The seat heater and power supply are inoperative. During the vehicle test, the seat module does not respond. The power supply fuse for the seat module isfound to have blown.
- [B612723](/bulletins/10247578.md), 2024-01-03, Service bulletin: ELECTRICAL SYSTEM. When using the Key Reader to retrieve CBS information from the customer key, no current vehicle data is available, or the data does not match the maintenance schedule.

JSON: [/v1/bulletins/10172489](/v1/bulletins/10172489)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20B120420&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F10172489&vehicle=Service%20bulletin%20B120420)