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2018 BMW

M240i Convertible

Man 6-spd, 6 cyl, 3.0 L, Turbo

BMW M240i: best and worst years
2018 BMW M240i Convertible

Photo may show a different model year; you're viewing the 2018.

PhotoHJUdallCC0via Wikimedia Commons

Overview

Drivetrain
Rear-Wheel DriveEPA, from EPA, last updated 6/22/2026

Engine & performance

HP
335
Power to weight
0.091 hp/lb
Axle ratio
3.08

Efficiency

Smog score
3/10
SmartWay certified
No

Dimensions & capacity

GVWR class
Class 1 (6,000 lb or less)NHTSA vPIC, from NHTSA vPIC, last updated 10/13/2026

Safety NHTSA record NHTSA, model year

Recalls
2
Owner complaints
3 See on NHTSA

Feature availability

Cameras & visibility

  • Backup camera
    Standard

Convenience

  • Push-button start
    Standard

Exterior

  • Adaptive headlights
    Optional

Reported problems NHTSA record NHTSA owner complaints, model year

  • EXTERIOR LIGHTING67%
  • ELECTRICAL SYSTEM33%

Source: NHTSA owner complaints, 3 total.

BMW M240i: best and worst years

Known issues manufacturer service bulletins, model year

109 service bulletins filed with NHTSA for this model year

  • May 5, 2026ENGINEB010224

    The EVAP systems purge (vent) valve limited warranty for defects in materials or workmanship has been extended to 15 years / 150,000 miles as determined from the original in-service date.

  • Jan 11, 2024ELECTRICAL SYSTEMB611305

    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.

  • Jan 8, 2024STEERINGB360121

    At low outside temperatures (below 40 degrees F) and slow driving speeds (i.e. when parking, maneuvering)with a large steering angle, the front end can be slightly axially misaligned. This can be felt (jerking)/ heard via an acoustic acknowledgement (clunk) as seen at the 11 second mark of the video. See attached video V36 01 21.

  • Nov 13, 2023ENGINE AND ENGINE COOLINGB011423

    PRESSURE CONTROL VALVE (PCV) EXTENDED LTD WTY 15 YEARS/150,000 MILES

  • Oct 13, 2023SERVICE BRAKES, HYDRAULICB340714

    Functional noises (squealing/honking) when braking shortly before the vehicle comes to a stop. CAUSE Material-

  • May 1, 2023ELECTRICAL SYSTEMB651523

    After programming the head unit (HU-H2), activating the FSC (German word Freischaltcode) Enabling Codes repeatedly fails.

  • Mar 1, 2023EQUIPMENTB840822

    The 3G network in the US has been shut down. This means that only the 4G network will be available. In the 4G network, voice calls will be transferred via the Voice over LTE (VoLTE) function. For this purpose, the SIM card must perform an IMS registration in the mobile communication network. Due to a production error, the telematics control units were delivered without an IMS configuration. The Connected Drive voice services (Concierge Call, BMW Assistance, and emergency call voice) can no longe

  • Dec 1, 2022POWER TRAINB122519

    After an automatic engine start (MSA start), the transmission intermittently goes into the Park "P" or Neutral "N" position without any customer influence.

  • and 101 more

Source: NHTSA manufacturer communications (technical service bulletins).

Warranty manufacturer terms, by make

Basic
4 yr / 50k mi
Powertrain
4 yr / 50k mi
Roadside assistance
4 yr
Maintenance
3 yr / 36k mi
EV battery
8 yr / 100k mi

Source: bmwusaservice.com as of 2026-06

Information is gathered on a best-effort basis from public sources, may be incomplete or out of date, and is not purchasing or financial advice. Verify with the manufacturer or dealer before buying.