Most common 2005 BMW 645ci problems
Share of the 33 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
BMW 645ci complaints by model year
What 2005 BMW 645ci owners say
Air bags
I was driving on the autobahn and my BMW 645 and all fault message were displayed. After that, the car speed abruptly,then just cut off!I it restarted with codes and all then shut off again. This continued five times until I reached my destination. I restart the car,and it started, but the radio and door siren was not working with no fault messages;no service engine light; and drove fine for a few min. And then did the same thing again!! I took the car to a BMW repair shopped to have the fault codes read, which end up being a long list of codes.
I placed an item in the front passenger side seat without fastening the seatbelt and the airbag light came on and stayed on... This is the first time this has ever happened. The car was stationary but the engin was running.
Brakes
The brake vacuum pump seals are leaking. This ultimately will affect the brake assist and potentially result in failure to stop the vehicle within prescribed stopping distances creating potential for a crash. This problem was identified by the local BMW dealership in highlands ranch denver. Oct 1 2010 BMW recalled 198,000 vehicles including v8 and 6 series vehicles for this exact same problem but my VIN shows no recall notice however it has the exact same component experiencing the exact same issues and BMW is refusing to acknowledge that my vehicle should be recalled as for this VIN there are no outstanding notifications. I repeat the exact same issue is being experienced on my vehicle as was the reason for 198,000 vehicles recalled from the notice of oct 1 2010
Tl* the contact owns a 2005 BMW 645ci. The contact stated that an unknown fluid was leaking from engine compartment. The contact stated no warning light was illuminated. The vehicle was taken to an independent mechanic where it was diagnosed with needing the vacuum pump to be replaced. The vehicle was not repaired. Upon investigation, the contact associated the failure with NHTSA campaign number: 10V446000 (service brakes, hydraulic) however, the VIN was not included. The manufacturer had not been informed of the failure. The failure mileage was approximately 120,000.
Engine & cooling
I own a BMW 645ci 2005 convertible I have issues yes isssues with this vechile, first issue is the infamous idrive that never really worked properly since I purchased the car, it blinks on and off for 30mins then it would magically come on until one day it just didn't come back on this was after a trip to the dealer to get the convertible top lock reprogrammed.. So the car was included in the lawsuit so I takes it to the dealer for the reprogramming and my car came out worst then it went in the idrive never worked to this day which is 04/16/2018, my top only opens with the passenger side door slightly opened yes the door has to be open for the top to operate... This is what the dealer told me so I was so confused of what the reprogramming was for ? I need answers and it's nothing I did as a owner I was very to the book when it came to opening my top and operating the idrive and etc... …
The car was driven home from work, approximately 15 miles, and was parked in the garage of our home. Ten minutes later it combusted and began burning from the engine compartment. It burned to the ground and gutted our house.
2005 BMW 645ci engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 4.4L 8-cyl | 6-speed automatic | RWD | 16 / 24 / 19 |
| 4.4L 8-cyl | 6-speed manual | RWD | 15 / 23 / 18 |
EPA ratings. Class: Subcompact car.
Frequently asked questions
Is the 2005 BMW 645ci a good car?
There isn't enough complaint history for the 645ci to compare model years reliably. So far owners have filed 33 complaints with NHTSA.
What is the most common problem with the 2005 BMW 645ci?
The air bags — 10 complaints, 30% of all complaints for this model year. Next are the brakes (6) and engine & cooling (5).
How many recalls does the 2005 BMW 645ci have?
NHTSA lists no recalls for the 2005 BMW 645ci. You can still confirm with your VIN using our VIN recall check.
At what mileage do 2005 BMW 645ci problems happen?
The median mileage reported in complaints is about 76,000 miles; 14% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.