2020 Bmw M340I: Reliability Data

Source: NHTSA — 54 complaints
54
Total Complaints
28,162mi
Median Mileage
ENGINE
Top Issue
0
Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

21,581 25th Percentile
28,162 Median Mileage
52,757 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

ENGINE
28
UNKNOWN OR OTHER
9
ELECTRICAL SYSTEM
6
ENGINE AND ENGINE COOLING
3
FUEL/PROPULSION SYSTEM
3
TIRES
2
SERVICE BRAKES
1
POWER TRAIN
1
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE (PCV)
1

Severity Assessment

0
Crashes
0
Fires
0
Injuries
0
Deaths

Sample Complaint Reports

"TL* THE CONTACT OWNS A 2020 BMW M340I, EQUIPPED WITH PIRELLI TIRES, TIRE LINE: P7 CINTURATO, TIRE SIZE 225/40/R19, DOT NUMBER: NOT AVAILABLE. THE CONTACT STATED THAT WHILE THE VEHICLE WAS AT AN INDEPENDENT MECHANIC FOR SUSPENSION INSPECTION, THE MECHANIC BECAME AWARE OF BUBBLES IN THE DRIVER'S AND P..."
"I WAS DRIVING ON THE HIGHWAY AT APPROXIMATELY 70 MPH, THE POSTED LIMIT, WHEN ALL OF A SUDDEN THE SUNROOF EXPLODED. IT SOUNDED LIKE A GUNSHOT AND I ALMOST LOST CONTROL OF THE VEHICLE. LUCKILY THE HEADLINER WAS CLOSED SO THE GLASS DID NOT ENTER THE CABIN. THERE WERE NO VEHICLES IN FRONT OF US FOR AT L..."
"THE FRONT COLLISION SYSTEM DOES NOT WORK. EARLY WARNING RARELY COMES ON, AND IN A RECENT NEAR CRASH ON THE DALLAS NORTH TOLLWAY, IT NEVER CAME ON. EVERY NOW AND THEN, THE EARLY WARNING FRONT COLLISION WARNING WILL COME ON FOR A SECOND, BUT THERE IS NO REASON FOR IT. I TOOK IT TO THE LOCAL DEALERSHIP..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28