What are the most common BMW M2 problems?

According to Au7o's analysis of 570+ owner reports, the 2021-2021 BMW M2 has 2 documented issues. The most frequently reported are: S55 Crank Hub Bolt Loosening, DCT (M-DCT) Mechatronics Unit Failure. Of these, 2 are rated critical and should be addressed promptly.

Is the BMW M2 reliable?

The 2021-2021 BMW M2 has 2 known issues documented across 570+ owner reports. 2 issues are rated critical: S55 Crank Hub Bolt Loosening and DCT (M-DCT) Mechatronics Unit Failure. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common BMW M2 problems?

Repair costs for known BMW M2 issues range from $400 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, S55 Crank Hub Bolt Loosening, typically costs $400-$1,200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

2021 BMW M2 Problems: 2 Issues Every Owner Should Know

2021 BMW M2 Problems: 2 Issues Every Owner Should Know | Au7o

All 2 Known Issues

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Community Reported

350 owners

On the 2016-2021 BMW M2 S55, the F87 M2 Competition shares the S55 twin-turbo inline-6 with the M3/M4, which suffers from the well-documented crank hub bolt issue. The factory single-use stretch bolt can loosen under repeated high-RPM use, causing timing loss and catastrophic engine damage. This is especially common in cars used on track.

This issue also affects: Citroën C3, Citroën DS3, Peugeot 2008

Common Symptoms

Check engine light
Rough idle
Misfires at high RPM
Timing fault codes
Rattling from front of engine
Loss of power under load
Engine stall at idle

How to Fix

Replace the factory stretch bolt with an upgraded ARP or IND crank hub bolt kit. Requires removing the front accessories, harmonic balancer, and properly torquing the new bolt to spec. Preventative replacement is strongly recommended before any track use.

What Owners Are Using

Parts and tips from 350+ owners who fixed this issue

UpgradeIND Distribution crank hub bolt kit — the gold standard fix for S55 engines (IND Distribution #IND-S55-CHB)
View on Amazon
NoteFactory stretch bolt is single-use. Never reuse the OEM bolt after removal.
TipMany M2 Competition owners do this as a preventative measure at the first oil change before any track days.

Typical repair cost:$400 - $1,200

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350+ owners have reported this issue

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Community Reported

High Confidence350 reportsLast reported by owners Mar 2026Reviewed Mar 2026

Community Reported

220 owners

On the 2016-2021 BMW M2, the 7-speed M-DCT dual-clutch transmission in F87 M2 models can develop mechatronics unit failures, causing harsh shifting, failure to engage gears, or transmission fault warnings. The issue is related to the solenoid pack and hydraulic valve body within the mechatronics sleeve.

Common Symptoms

Harsh or delayed shifts
Transmission malfunction warning
Failure to engage gear
Grinding noise during shifts
Limp mode activation
Check engine light
Jerking at low speeds

How to Fix

Replace or rebuild the mechatronics unit. In some cases, a transmission adaptation reset via ISTA can resolve early-stage symptoms. Severe cases require full mechatronics replacement, which involves dropping the transmission. Fluid change every 30k miles helps extend life.

What Owners Are Using

Parts and tips from 220+ owners who fixed this issue

TipRegular DCT fluid changes every 30,000 miles dramatically extend mechatronics life.
NoteDo not continue driving in limp mode — the mechatronics can overheat and cause further internal damage.
UpgradePentosin FFL-4 DCT fluid — BMW-approved dual-clutch transmission fluid (Pentosin #FFL-4)
View on Amazon

Typical repair cost:$2,500 - $6,000

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220+ owners have reported this issue

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Community Reported

High Confidence220 reportsLast reported by owners Mar 2026Reviewed Mar 2026

⚠️NHTSA Recalls4 recalls

SEAT BELTS

BMW of North America, LLC (BMW) is recalling certain 2021 2 Series (230i, 230i xDrive, M240i, M240i xDrive), 330e, 330e Xdrive, 4 Series Coupe (430i, 430i xDrive, M440i xDrive) M4 Coupe, M4 Competition Coupe, BMW 4 Series Convertible (430i, M440i), BMW X1 sDrive28i, xDrive28i, 2 Series Gran Coupe (228i, 228i xDrive, M235i xDrive), M2 Competition Coupe, 330i, 330i xDrive, M340i, M340i xDrive, M3, M3 Competition, 530i, 530i xDrive, 540i, 540i xDrive, MINI Hardtop 2 Door (Cooper, CooperS, JCW), X2 sDrive28i, X2 xDrive28i, X2 M35i, Z4 sDrive30i, Z4 M40i, MINI Hardtop 2 Door (Cooper SE), MINI Convertible (Cooper, Cooper S, JCW), MINI Clubman (Cooper S, Cooper S All4, JCW), MINI Countryman (Cooper, Cooper All4, Cooper S, Cooper S All4, JCW All4), Rolls Royce Ghost, MINI Countryman (Cooper S E All4), Rolls Royce Phantom, Rolls Royce Cullinan, and Toyota Supra vehicles. The passenger seat belt Automatic Locking Retractor (ALR) may deactivate early, before the webbing fully retracts. As such, these assemblies fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."

Campaign #21V55400021/07/2021

FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM

BMW of North America, LLC (BMW) is recalling certain 2020-2021 M2 Coupe and 2020 M4 Coupe vehicles. Fuel injectors may have been installed without a damping component which is used to reduce vibration. If a damping component is not present, vibration will increase at the connection between the fuel line and the fuel rail, which over time, can result in damage at the connection.

Campaign #20V66600029/10/2020

AIR BAGS:KNEE BOLSTER

BMW of North America, LLC (BMW) is recalling certain 2019-2020 230i, 230i xDrive, M240i, M240i xDrive, M2 Competition Coupe, 430i, 430i xDrive, 440i, 440i xDrive, M4, and 2019 330i xDrive Sportswagon vehicles. The driver and passenger knee air bag assemblies may have been improperly folded and assembled.

Campaign #19V35200009/05/2019

ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

BMW of North America, LLC (BMW) is recalling certain 2018 230i, 230i xDrive, M240i, M240i xDrive, M2, and X3 xDrive 30i SAV vehicles. These vehicles may have an error in the software for the instrument panel, causing the display to not properly illuminate. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 101, "Control and Displays."

Campaign #17V71900015/11/2017

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

2021 BMW M2 Problems: 2 Issues Every Owner Should Know

All 2 Known Issues

2016-2021 BMW M2: S55 Crank Hub Bolt Loosening#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2016-2021 BMW M2: DCT (M-DCT) Mechatronics Unit Failure#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

Other BMW Models

Frequently Asked Questions

What are the most common BMW M2 problems?

Is the BMW M2 reliable?

How much does it cost to fix common BMW M2 problems?

What is the 2016-2021 BMW M2 S55 Crank Hub Bolt Loosening?

What is the 2016-2021 BMW M2 DCT (M-DCT) Mechatronics Unit Failure?