2018 BMW 6 Series Problems: 4 Known Issues
2018 model year · 130+ owner reports · Updated October 2026
According to Au7o's analysis of 130+ owner reports, the 2018 BMW 6 Series has 4 documented known issues, with 2 rated critical. The most serious are N55 Electric Water Pump Failure (640i, F06/F12/F13) ($900-$3,300 repair) and N63TU1 650i Oil Consumption Requires BMW Diagnosis. The most commonly reported issue is Adaptive Headlight Module and Stepper Motor Failure with 130 owner reports. Across all issues with published estimates, repair costs range from $400 to $5,000. DIY maintenance guides at au7o.io.
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All 4 Known Issues
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Frequently Asked Questions
What are the most common BMW 6 Series problems?
According to Au7o's analysis of 130+ owner reports, the 2018 BMW 6 Series has 4 documented issues. The most frequently reported are: N55 Electric Water Pump Failure (640i, F06/F12/F13), N63TU1 650i Oil Consumption Requires BMW Diagnosis, Convertible Top Hydraulic Pump & Cylinder Failure (E64/F12). Of these, 2 are rated critical and should be addressed promptly.
Is the BMW 6 Series reliable?
The 2018 BMW 6 Series has 4 known issues documented across 130+ owner reports. 2 issues are rated critical: N55 Electric Water Pump Failure (640i, F06/F12/F13) and N63TU1 650i Oil Consumption Requires BMW Diagnosis. 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 6 Series problems?
Repair costs for known BMW 6 Series issues range from $400 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, N55 Electric Water Pump Failure (640i, F06/F12/F13), typically costs $900-$3,300 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2012-2018 BMW 6 Series N55 Electric Water Pump Failure (640i, F06/F12/F13)?
The 2012-2018 640i uses the N55 inline-six with an electric main coolant pump that is a known wear item across every N55 application. On 6Post, 640i owners report failures around 60,000-100,000 miles: sudden high-temperature warnings, reduced-power mode, the pump running continuo… Repairs typically run $900-$3,300. Severity: high.
What is the 2013-2019 BMW 6 Series N63TU1 650i Oil Consumption Requires BMW Diagnosis?
BMW SIB 01 01 22 identifies U.S.-specification F12 650i and 650i xDrive vehicles from model years 2013-2018, F13 650i and 650i xDrive vehicles from model years 2013-2017, and F06 650i and 650i xDrive Gran Coupe vehicles from model years 2013-2019 with the N63TU1 engine, subject t… Severity: high.
What is the 2004-2018 BMW 6 Series Convertible Top Hydraulic Pump & Cylinder Failure (E64/F12)?
E64 (2004-2010) and F12 (2012-2018) convertible models experience hydraulic top mechanism failures due to pump motor corrosion, seal degradation, and hydraulic cylinder leaks. The convertible top may stop mid-cycle, operate slowly, or refuse to open/close entirely. The hydraulic… Repairs typically run $600-$5,000. Severity: medium.
What is the 2012-2018 BMW 6 Series Adaptive Headlight Module and Stepper Motor Failure?
The adaptive (cornering) headlights on the 6 Series suffer from stepper motor and control module failures. The stepper motors that swivel the headlight beams left and right based on steering input wear out, causing the headlights to point in incorrect directions or not respond to… Repairs typically run $400-$1,200. Severity: low.
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.