BMW · Known Issues
2018 BMW M3 Problems: 7 Known Issues
2018 model year · 1,368+ owner reports · Updated September 2026
2018 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2018 model year · 1,368+ owner reports · Updated September 2026
2018 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 1,368+ owner reports, the 2018 BMW M3 has 7 documented known issues, with 2 rated critical. The most serious are S55 Crank Hub Slip/Failure ($800-$2,500 repair) and Crank Hub Slip/Failure (S55) - CRITICAL ($1,750-$2,500 repair). The most commonly reported issue is S55 Crank Hub Slip/Failure with 567 owner reports. Across all issues with published estimates, repair costs range from $200 to $2,500. DIY maintenance guides at au7o.io.
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."
SERVICE BRAKES, HYDRAULIC
BMW of North America, LLC (BMW) is recalling certain 2020-2021 8 Series Coupe, Grand Coupe and convertible 840i, 840i xDrive, M850i xDrive, M8 and 740 Li, 740 Li xDrive, 750 Li xDrive, M760 Li xDrive, X6 sDrive40i, X6 xDrive40i, X6 xdrive50i, X6 M50i, X6M, and 2019-2021 X5 sDrive40i, X5 xDrive40i, X5 xDrive50i, X5 M50i, X5M, X7 xDrive40i, X7 xDrive50i, X7 M50i, and 2021 M3, M3 Competition, M4 Coupe, M4 Competition Coupe, X5 xDrive45e, 745 Le xDrive. The rotor and shaft within the integrated brake system may not have been welded properly and could separate during a hard braking event, possibly resulting in a loss of the Antilock Brake System (ABS) and braking assistance.
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According to Au7o's analysis of 1,368+ owner reports, the 2018 BMW M3 has 7 documented issues. The most frequently reported are: S55 Crank Hub Slip/Failure, Crank Hub Slip/Failure (S55) - CRITICAL, S55 Plastic Charge Pipe Cracking. Of these, 2 are rated critical and should be addressed promptly.
The 2018 BMW M3 has 7 known issues documented across 1,368+ owner reports. 2 issues are rated critical: S55 Crank Hub Slip/Failure and Crank Hub Slip/Failure (S55) - CRITICAL. 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.
Repair costs for known BMW M3 issues range from $200 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, S55 Crank Hub Slip/Failure, typically costs $800-$2,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The BMW S55 twin-turbo inline-6 engine has a critical design vulnerability where the crank hub is secured only by a single bolt with friction material - no keyway or mechanical lock. Under high load conditions such as aggressive downshifts, hard acceleration, or increased boost f… Repairs typically run $800-$2,500. Severity: high.
The S55 crank hub is secured by a single bolt with friction material and no keyway. Under high load, the hub can slip on the crankshaft, throwing off valve timing and causing catastrophic engine damage costing $20,000+. This is considered mandatory preventive maintenance for any… Repairs typically run $1,750-$2,500. Severity: high.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
SEAT BELTS:FRONT:BUCKLE ASSEMBLY
BMW of North America, LLC (BMW) is recalling certain 2021 330i, 330i xDrive, M340i, M3, and 330e xDrive vehicles. The bolt securing the seat belt assembly to the frame was not tightened to specification.
ELECTRICAL SYSTEM:BODY CONTROL MODULE:SOFTWARE
BMW of North America, LLC (BMW) is recalling certain 2023 330i, 330i xDrive, M340i, M340i xDrive, M3, 330e, 330e xDrive, 430i Convertible, 430i xDrive, M440i, 2022-2023 430i, 430i xDrive, M440i xDrive, i4 eDrive40, and i4 M50 vehicles. During a service visit, a replacement electronic control unit (ECU) may have been installed with incorrect programming, which can cause the automatic door locking (ADL) function to not lock the doors as intended.
POWER TRAIN:DRIVELINE:DRIVESHAFT
BMW of North America, LLC (BMW) is recalling certain 2016-2017 BMW M3 Sedans, 2016-2017 BMW M4 and M4 GTS Coupes and 2017 BMW M4 Convertible vehicles. The connection between the driveshaft and the flange may fail resulting in a loss of propulsion.
+ 1 more recalls. Check all on NHTSA.gov
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The F80 M3's S55 engine uses a Y-shaped plastic charge pipe connecting both turbos to the throttle body. Under boost pressure, especially with tuning or on track, the plastic charge pipe can develop hairline cracks near the mounting brackets and turbo connections. These cracks of… Repairs typically run $300-$800. Severity: medium.
The S55 and S58 engines use electric water pumps rather than belt-driven pumps. While more efficient, these electric pumps are prone to failure and typically have a shorter lifespan than mechanical pumps. Failure can lead to overheating and potential engine damage if not addresse… Repairs typically run $800-$1,800. Severity: medium.
The factory plastic charge pipes (BMW 11617846245 for cylinders 1-3 and 11617846246 for cylinders 4-6) crack under boost pressure, even at stock levels. This causes immediate boost loss, reduced power, and a loud hissing sound. Failure rate increases dramatically with any tune. U… Repairs typically run $200-$400. Severity: medium.
The S55 uses an electric water pump (Continental/VDO OEM supplier) that can fail without warning, leading to rapid overheating. Typical failure occurs around 60,000 miles. The pump is belt-driven and failure causes rapid temperature rise. Continental is the OEM supplier. Repairs typically run $800-$1,600. Severity: medium.
The S55 direct injection system uses high-pressure fuel injectors that can fail, causing misfires, rough running, and check engine lights. Updated OEM injectors (BMW 13538616079) are available. For tuned cars, 1200cc Bosch injectors from the S63TU provide 33% more fuel flow. Repairs typically run $500-$1,500. Severity: medium.