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BMW 645CIModel year report

2004 BMW 645CI Problems

Complaints
11filed with NHTSA
Median mileage
75,000miles, 7 complaints with mileage
Recalls
0campaigns on record
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA crash rating
—overall rating starts with 2011 models
EPA fuel economy
18 mpgcombined, 4.4L 8-cyl RWD · 15 city / 23 hwy

Sources: NHTSA records for the 2004 BMW 645CI (complaints, recalls, investigations), EPA fuel economy. Report an error

NHTSA recorded 11 consumer complaints for the 2004 BMW 645CI. The part named most often is air bags, with 5 complaints (45% of the total), followed by seat belts (4) and electrical system (3). 7 of the complaints include a mileage, and 14% of those were filed for vehicles with under 50,000 miles; the median is 75,000 miles. NHTSA lists 0 recall campaigns and 45 technical service bulletins for this model year.

This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Also reported: Wheels (1).

Example complaints

Air bags: “I have the same problem in which this is the number you have provided but not including my yr. It was only for 2006 models and I have a 2004 but same exact problems. I have read and seen others with the same problem. Some dealerships honored the recall or service offer but they will not for me and this is a safety issue not a luxury option. Nhtsa action number : ea08001 NHTSA recall campaign number : 08v384000.”

NHTSA complaint #10604959, filed 2014-06, 56,555 miles

Seat belts: “Passenger restraint system failure fault light has started showing on my Bmw. There has been a recall reported on the same component statement on voluntary recall involving front passenger seat sensor mat on u.s.a. Model bmws - august 13, 2008 . It is NHTSA recall campaign number: 08v384000. I have the same problem so I called Bmw and they stated that my car is not part of the recall. I do not understand how my car is having the exact same problem but is not part of the recall? This is a huge safety issue. …”

NHTSA complaint #10554565, filed 2013-12, 37,260 miles

Electrical system: “The idrive system in my car continues to cut on and off, this eventually caused my car to shut off on me two times while in traffic with no warning or indication of the shut off. The sensor alert continuously goes off for everything in the car. I took my car to the BMW dealership in Huntsville Alabama, they had my car for almost a month and could not find the issue with the drive or anything the sensors were notifying me of. …”

NHTSA complaint #11431834, filed 2021-09

Brakes: “The contact owns a 2004 Bmw 645CI. The contact stated that the vehicle was repaired under NHTSA campaign id number 10v446000 (service brakes, hydraulic:power assist:vacuum). The contact stated that a year after the repairs were completed, a brake failure occurred and there had not been a failure present before the vehicle was serviced under the recall. The vehicle was taken to the dealer where it was confirmed that the master cylinder and booster had failed. The vehicle was not repaired. The manufacturer was contacted about the issue. …”

NHTSA complaint #10484964, filed 2012-11, 150,000 miles

Mileage when problems were reported

14% of the 7 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 61,000 and 90,000 miles.

0%0–100%10–2514%25–5029%50–7529%75–10014%100–15014%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (7 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 75,000 miles.

Complaints by year filed

Fewer than 15 complaints, too few for a reliable trend.

20112012220132014220152017201820212024
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Fuel economy and running cost

EPA ratings for each 2004 BMW 645CI version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
645ci RWD4.4L 8-cyl6-speed automatic162419$4,350
645ci RWD4.4L 8-cyl6-speed manual152318$4,550
645ci RWD4.4L 8-cyl6-speed automatic152217$4,850
645ci Convertible RWD4.4L 8-cyl6-speed automatic162419$4,350
645ci Convertible RWD4.4L 8-cyl6-speed manual132116$5,150
645ci Convertible RWD4.4L 8-cyl6-speed automatic132116$5,150

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

NHTSA lists no recall campaigns for the 2004 BMW 645CI in the data used here. A recall can apply to some vehicles of a model year and not others, so check a specific vehicle by VIN at nhtsa.gov/recalls.

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 45 on record; the latest 10 are shown.

See all 45 bulletins →

Other model years of the BMW 645CI

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
20053374,1150—18Not compared (before 2008)Falling
20041175,0000—18—Not enough data

All BMW 645CI model years

Frequently asked questions

How many NHTSA complaints does the 2004 BMW 645CI have?

NHTSA recorded 11 consumer complaints for the 2004 BMW 645CI as of Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2004 BMW 645CI is reported most often?

Air bags is named most often, in 5 complaints (45% of the total), followed by seat belts with 4.

Has the 2004 BMW 645CI been recalled?

NHTSA lists no recall campaigns for this model year in the data used here. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

What gas mileage does the 2004 BMW 645CI get?

The EPA rates the 2004 BMW 645CI (645ci, 4.4L 8-cyl) at 18 mpg combined, 15 city and 23 highway, with an estimated annual fuel cost of $4,550 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2004 BMW 645CI reported?

Among the 7 complaints that include a mileage, the median is 75,000 miles and the middle half falls between 61,000 and 90,000 miles; 14% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.