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EnginePart report

2018 BMW 430I Engine Problems

Complaints
14about this part
Share
39%of 36 total for the year
Median mileage
45,600miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 14 complaints about the engine of the 2018 BMW 430I, 39% of the 36 complaints for this model year. Where a mileage was given, the median is 45,600 miles. 2 of these say a crash was involved and 1 a fire, according to the filers.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“My BMW 430i 2018showed no warning and suddenly the car started to shake, I stopped immediately and after the car cooled, there was no coolant, the oil temperature gage was always on normal. The car overheated and caused catastrophic engine failure, and need replacement. Upon inspection by several mechanics, its obvious the coolant leak from a hose that connects with engine block”

NHTSA complaint #11580162, filed 2024-03

“When I cold started the car it rattled and shook, this stopped and the car was fine to drive. When I was on the road the cars check engine light came on and the car suddenly slowed down. An error popped up saying that there is a “powertrain malfunction”. BMW dealership said that it is a failure in VANOS system. There was a recall on other BMW models expect mine, 2018 BMW 4 series.”

NHTSA complaint #11575651, filed 2024-03

“Disconnect coupling on cylinder head broke caused loss of coolant from engine. Overheated my Car damaged the engine and the car did accelerate when I was crossing a highway almost causing a collision”

NHTSA complaint #11679358, filed 2025-08

“I pulled out onto Southside Blvd. My brakes failed, my driver’s front of the car hit a Waste Management garbage truck right back tire and cut the sidewall of the tire. The engine was racing, the truck pulled off the road, and I had sudden unintended acceleration. I immediately turned into a strip center and my car was racing through the strip center, the brakes were not working, the car controls were not working, and I turned the ignition switch off and the car stopped. The car had to be towed. …”

NHTSA complaint #11630502, filed 2024-12

“In Oct 2022, I was driving normally and suddenly got a message on the dash saying something like Coolant low, please top up when you have a chance . A minute or so later, I got the red warning Engine Overheated, turn off engine when safe and it went into limp mode, and I pulled over immediately and had to flatbed my car to a dealer. Then told me there was a coolant leak (which I was not aware and there was no error message regarding coolant prior to the incident.) And they told me there was a recall on my vehicle coolant vent line. …”

NHTSA complaint #11599543, filed 2024-07

Related service bulletins

Engine: other model years

YearComplaintsShare of year
2025233%
2022225%
2021320%
2019835%
20181439%
2017936%

Other parts of the 2018 BMW 430I

Engine cooling
8 complaintsElectrical system
5 complaintsSeat belts
4 complaintsOther or unknown
3 complaintsSeats
3 complaintsAir bags
2 complaintsBrakes
2 complaintsFuel system
2 complaintsTransmission and drivetrain
2 complaintsBack-over prevention (rear camera)
1 complaintsLane departure
1 complaintsTires
1 complaints

← All problems reported for the 2018 BMW 430I

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology