2008 BMW 6 Series Problems: 11 Known Issues
2008 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated November 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2008 BMW 6 Series has 11 documented known issues, with 4 rated critical. The most serious are Engine oil can reach the brake booster and reduce power assist — recall 10V446, Battery cable connection in the trunk can loosen and overheat — recall 12V126, SMG gearbox hydraulic pump or pump motor failure (owner reports) and S85 V10 Rod Bearing Wear (E63/E64 M6) ($2,500-$4,500 repair). Across all issues with published estimates, repair costs range from $2,500 to $4,500. DIY maintenance guides at au7o.io.
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All 11 Known Issues
NHTSA Recalls5 recalls
ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES
BMW IS RECALLING CERTAIN MODEL YEAR 2004-2010 5-SERIES, MODEL YEAR 2004-2010 6-SERIES, MODEL YEAR 2006-2010 M5, AND MODEL YEAR 2007-2010 M6 VEHICLES. THE INSULATED BULKHEAD CONNECTOR FOR THE POSITIVE BATTERY CABLE MAY HAVE BEEN INCORRECTLY ATTACHED TO THE TRUNK FLOOR PANEL, WHICH CAN LEAD TO A LOOSENING OF THE BOLT CONNECTION. AS IT LOOSENS, AN INCREASE IN ELECTRICAL RESISTANCE AT THIS CABLE CONNECTION IS POSSIBLE AND COULD CAUSE THE CABLE CONNECTION TO OVERHEAT.
SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM
BMW IS RECALLING CERTAIN MODEL YEAR 2004-2010 5-SERIES, 6-SERIES, AND MODEL YEAR 2002-2008 7-SERIES VEHICLES. A CHECK VALVE OF THE BRAKE VACUUM PUMP MAY LEAK A SMALL AMOUNT OF LUBRICATING OIL. OVER TIME THIS COULD RESULT IN CONTAMINATION OF THE BRAKE BOOSTER.
SUSPENSION:REAR:SHOCK ABSORBER
ON CERTAIN PASSENGER VEHICLES, THE LOWER RUBBER MOUNT OF THE REAR SHOCK ABSORBERS MAY NOT HAVE BEEN MANUFACTURED TO SPECIFICATIONS AND MAY NOT ADHERE CORRECTLY TO ITS HOUSING WITHIN THE SHOCK ABSORBER.
SUSPENSION:FRONT:CONTROL ARM
ON CERTAIN PASSENGER VEHICLES, THE NUTS WHICH SECURE THE FRONT AXLE CONTROL ARM AND TENSION STRUT TO THE FRONT WHEEL HUB MAY NOT HAVE BEEN TIGHTENED TO SPECIFICATION. OVER TIME THE NUTS COULD LOOSEN AND THE CONTROL ARM AND TENSION STRUT COULD BE DAMAGED.
POWER TRAIN:AUTOMATIC TRANSMISSION
CERTAIN PASSENGER VEHICLES MAY HAVE BEEN BUILT WITH AN INCORRECTLY MANUFACTURED AUTOMATIC TRANSMISSION PARKING PAWL GUIDE PLATE.
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Frequently Asked Questions
What are the most common BMW 6 Series problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2008 BMW 6 Series has 11 documented issues. Documented issues include: Engine oil can reach the brake booster and reduce power assist — recall 10V446, Battery cable connection in the trunk can loosen and overheat — recall 12V126, SMG gearbox hydraulic pump or pump motor failure (owner reports). Of these, 4 are rated critical and should be addressed promptly.
Is the BMW 6 Series reliable?
The 2008 BMW 6 Series has 11 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: Engine oil can reach the brake booster and reduce power assist — recall 10V446 and Battery cable connection in the trunk can loosen and overheat — recall 12V126 and SMG gearbox hydraulic pump or pump motor failure (owner reports) and S85 V10 Rod Bearing Wear (E63/E64 M6). 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 $2,500 to $4,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2004-2010 BMW 6 Series Engine oil can reach the brake booster and reduce power assist — recall 10V446?
Engine oil may enter the brake booster vacuum supply line via the brake vacuum pump and contaminate the brake booster, which may damage its membrane. The membrane can then leak, which could lead to reduced or no brake power assistance; BMW notes the car can still be slowed and st… Severity: high.
What is the 2004-2010 BMW 6 Series Battery cable connection in the trunk can loosen and overheat — recall 12V126?
The positive battery cable runs from the trunk-mounted battery to the engine through a bolted connection secured to the trunk floor by an insulated bulkhead connector. In very rare cases the connector may not be properly attached, the bolted joint can loosen over time, and this m… Severity: high.
What is the 2004-2010 BMW 6 Series SMG gearbox hydraulic pump or pump motor failure (owner reports)?
Owners of SMG-equipped 645Ci and M6 cars report the SMG hydraulic pump or its electric motor failing, with low-pressure faults, transmission malfunction warnings, shift hesitation and, in some cases, the car stuck in neutral. Applies to: E63/E64 cars with the SMG automated manual… Severity: high.
What is the 2006-2010 BMW 6 Series S85 V10 Rod Bearing Wear (E63/E64 M6)?
The S85 V10 in the 2006-2010 M6 shares the E60 M5's rod bearing issue: tight bearing clearances combined with the factory 10W-60 oil produce accelerated wear, and worn bearings can progress to a spun bearing and engine destruction. M5Board's picture thread and M6-specific threads… Repairs typically run $2,500-$4,500. Severity: high.
What is the 2004-2010 BMW 6 Series Blocked convertible top-well drains let water into the trunk electronics (owner reports)?
Owners of E64 convertibles report the drains in the soft-top storage well blocking, so water overflows into the trunk, where it has soaked the carpet and damaged the trunk amplifier and other trunk electronics, with "central electronics failure" messages and loss of sound reporte… Severity: medium.
What is the 2004-2010 BMW 6 Series N62 V8 exhaust smoke and oil burning from worn valve stem seals (owner reports)?
Owners of N62 645Ci and 650i report exhaust smoke and oil consumption that they attribute to hardened valve stem seals. Applies to: E63/E64 645Ci and 650i with the N62 V8, reported by owners. Severity: medium.
What is the 2004-2010 BMW 6 Series Dynamic Drive (active roll stabilization) malfunction warning (owner reports)?
Owners of E63/E64 cars with Dynamic Drive report "Dynamic Drive malfunction" warnings, sometimes intermittent. Causes named in the threads include low or dirty fluid in the shared hydraulic reservoir, charging-system over-voltage, and a failed valve block or sensor. Applies to: E… Severity: medium.
What is the 2004-2010 BMW 6 Series Convertible soft top stops working or leaks hydraulic fluid (owner reports)?
Owners of E64 convertibles report the power soft top refusing to move or stopping, and hydraulic fluid leaking from a lift cylinder or its line. Causes in the threads include leaking cylinders or lines, low fluid in the top pump reservoir and loose electrical connections. Applies… Severity: medium.
What is the 2004-2010 BMW 6 Series N62 V8 oil leak at the alternator bracket gasket (owner reports)?
Owners of N62 V8 645Ci and 650i report oil leaking from the alternator bracket gasket on the front of the engine; owners describe it as a pressurized oil joint that can leak heavily, coating the alternator area and parts below it. Applies to: E63/E64 645Ci (N62B44) and 650i (N62B… Severity: medium.
What is the 2004-2008 BMW 6 Series iDrive navigation computer (CCC) stuck on the BMW logo or blank screen (owner reports)?
Owners report the iDrive screen showing only the BMW logo or going blank, with radio and navigation lost, on E63/E64 cars with the CCC navigation computer. Owner threads point to the CCC unit itself, its DVD drive, or a weak battery or display cable before the unit is condemned. Severity: medium.
What is the 2006-2010 BMW 6 Series S85 Throttle Valve Actuator Failure (Limp Mode, M6)?
The S85 uses separate throttle actuation for each bank. Actuation faults can cause reduced power, but the fault code and live position data identify a diagnostic path rather than uniquely proving worn gears. Mechanical, motor, electronic, supply and connection faults must be dist… Severity: medium.
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.