The 6 Series revives a tradition of a big BMW coupe, the last of which ended with the demise of the 8 Series in the mid-1990s. Unlike the original 630csi coupe, which was an independent car, the new 6 Series shares a platform with the recently redesigned midsize 5 Series. The standard engine is the smooth and punchy 4.4-liter V8 that's also found in the 545i and 745i sedans. Thus the designation of 645Ci.
Alerts
There are 5 recalls on this vehicle. Learn More.

Reliability

Reliability indicates how models have performed in the past, providing the basis for predicting how the vehicles will hold up in the year ahead. These charts provide the most comprehensive reliability information available to consumers. Based on information received from our latest subscriber survey, our reliability history charts give you a rundown on how used vehicles are holding up in 17 potential trouble spots, ranging from the engine, transmission, and brakes to power equipment and the electrical system.

Overall Reliability
The 2004 BMW 6 Series has been recalled 5 times by NHTSA. View Recalls

No Detailed Data Available

Consumer Reports obtains its reliability data from a questionnaire that is sent to subscribers. In the questionnaire, we ask subscribers to note any problems with their cars that occurred in the past 12 months. They are asked to identify problems that they considered serious (because of cost, failure, safety, or downtime).

A typical model has about 200 to 400 samples for each model year. For some model years, typically those of older or less popular cars, we do not have a large enough sample size to provide results of statistical confidence.

There are several ways in which a savvy car buyer can still research the quality of a car.

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Recalls
PROVIDED BY
ENGINE AND ENGINE COOLING
Aug 10, 2012
This condition could cause the fan motor to become inoperative, or cause the motor circuit board in the assembly to overheat, potentially leading to a fire in the engine compartment.
Summary:
This recall involves aftermarket parts sold by Valeo. Valeo is recalling certain engine cooling fans, part numbers 696121, 696273, and 696275, used as service replacement parts for model year 2008-2011 BMW 1-Series, 2006-2011 BMW 3-Series, 2000-2009 BMW 5-Series, 2004-2005 BMW 6-Series, and 2006-2007 BMW 7-Series vehicles. A metal-oxide semiconductor may overheat due to insufficient screwing of the semiconductor on the aluminum heat sink. This primary failure could cause adjacent components on the fan assembly motor circuit board to overheat and short.
What should you do:
Valeo will notify owners and replace the fans free of charge. The safety recall began on August 22, 2012. This recall is being conducted by Valeo, not by BMW. For further information, owners may contact Valeo at 1-888-718-2536.
For more information:
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
NHTSA CAMPAIGN ID Number: 12E029000
Potential Number of Units Affected: 585
ELECTRICAL SYSTEM
Mar 26, 2012
OVERHEATING COULD LEAD TO A FIRE, EVEN WHILE THE VEHICLE IS NOT IN USE. AS A PRECAUTION, OWNERS ARE ADVISED TO PARK OUTSIDE UNTIL THE REMEDY HAS BEEN MADE.
Summary:
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.
What should you do:
BMW WILL NOTIFY OWNERS, AND DEALERS WILL INSPECT AND SECURE THE BATTERY BOLT CABLE CONNECTION AS NECESSARY, FREE OF CHARGE. THE SAFETY RECALL BEGAN ON APRIL 30, 2012. OWNERS MAY CONTACT BMW CUSTOMER RELATIONS AND SERVICES AT 1-800-525-7417.
For more information:
CUSTOMERS MAY CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY: 1-800-424-9153); OR GO TO HTTP://WWW.SAFERCAR.GOV.
NHTSA CAMPAIGN ID Number: 12V126000
Potential Number of Units Affected: 367682
SERVICE BRAKES, HYDRAULIC
Oct 01, 2010
POWER ASSIST BRAKING PERFORMANCE COULD BE ADVERSELY AFFECTED. IN EXTREME CASES THERE COULD BE A COMPLETE LOSS OF POWER ASSIST BRAKING. AN UNEXPECTED REDUCTION OR LOSS IN POWER BRAKING ASSIST MAY INCREASE THE RISK OF A CRASH.
Summary:
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.
What should you do:
BMW WILL NOTIFY OWNERS AND DEALERS WILL REPAIR THE VEHICLES FREE OF CHARGE. THE SAFETY RECALL BEGAN ON NOVEMBER 24, 2010. OWNERS MAY CONTACT BMW AT 1-800-525-7417.
For more information:
OWNERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO <A HREF=HTTP://WWW.SAFERCAR.GOV>HTTP://WWW.SAFERCAR.GOV</A> .
NHTSA CAMPAIGN ID Number: 10V446000
Potential Number of Units Affected: 198352
POWER TRAIN
Jul 14, 2004
AS A RESULT, ENGINE STALLING WILL OCCUR AFTER A SHORT PERIOD OF OPERATION. THE VEHICLE MAY NOT BE ABLE TO RESTART. ALSO, A LOSS OF POWER STEERING AND, AFTER REPEATED ACTUATION OF THE BRAKE PEDAL, A LOSS OF BRAKE POWER ASSIST WILL OCCUR. THESE CONDITIONS COULD RESULT IN A VEHICLE CRASH.
Summary:
ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH 8 AND 12 CYLINDER ENGINES, THE DIGITAL ENGINE MANAGEMENT CONTROL (EMC) UNITS WERE NOT PRODUCED ACCORDING TO SPECIFICATIONS.
What should you do:
DEALERS WILL INSTALL A NEW DIGITAL ENGINE MANAGEMENT CONTROL UNIT. THE RECALL BEGAN ON JULY 16, 2004. OWNERS SHOULD CONTACT BMW AT 1-800-831-1117.
For more information:
CUSTOMERS CAN CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).
NHTSA CAMPAIGN ID Number: 04V344000
Potential Number of Units Affected: 4102
FUEL SYSTEM, GASOLINE
Jun 23, 2004
IN THE EVENT OF A SEVERE FRONTAL CRASH, THE QUICK-RELEASE COUPLING COULD SEPARATE CAUSING FUEL LEAKAGE. FUEL LEAKAGE, IN THE PRESENCE OF AN IGNITION SOURCE, COULD RESULT IN A FIRE.
Summary:
ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH 8-CYLINDER ENGINES, A CIRCULAR RETENTION CLIP AT THE QUICK-RELEASE COUPLING ALONG THE FUEL SUPPLY LINE WAS INADVERTENTLY NOT INSTALLED.
What should you do:
DEALERS WILL INSTALL A CIRCULAR RETENTION CLIP AT THE QUICK-RELEASE COUPLING ALONG THE FUEL SUPPLY LINE. THE RECALL BEGAN ON JULY 5, 2004. OWNERS SHOULD CONTACT BMW AT 1-800-831-1117.
For more information:
CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).
NHTSA CAMPAIGN ID Number: 04V303000
Potential Number of Units Affected: 7532
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