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What 15 owners told NHTSA about the 2021 BMW 4 Series Gran

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (15)Electrical system (6)Engine (3)Seat belts (3)Tires (1)Transmission & drivetrain (1)

3 of 15 complaints match · Engine · clear filters

Apr 27, 2026Engine

The recall was issued more than 8 months ago but the remedy is still not yet available, which is very concerning as the problem may cause the event of fire even when the vehicle is parked. Issued SEP 23, 2025 Description of Problem It is possible for water to contact and enter the engine starter. This could lead to corrosion which could cause a short circuit. Safety Risk This could increase the risk of a thermal event or fire during driving or even when the vehicle is parked and the ignition is off.

NHTSA ODI 11734108

Apr 4, 2026Engine

The engine Unknown The problem was confirmed by BMW as they sent me a notice. Unknown Unknown

NHTSA ODI 11729210

Jan 8, 2026Engine

The component that malfunctioned is the engine starter relay, which is subject to an open BMW/NHTSA safety recall (issued September 2025) due to potential corrosion causing overheating, short circuits, and vehicle fire risk. The recall specifically advises parking the vehicle outside and away from structures until repaired. The vehicle is available for inspection upon request.My safety and the safety of my family were put at risk because the dealership (Capitol Nissan in San Jose) failed to disclose this critical fire-risk recall before or during the sale on January 4, 2026, despite it being noted on the provided Carfax report (without any explanation of its severity). I only learned of the fire hazard and "park outside" warning when an authorized BMW dealer informed me during an inspection on January 5, 2026.The recall issue has been confirmed by an authorized BMW dealer on January 5, 2026.The vehicle has been inspected by an authorized BMW dealer, but not yet by the manufacturer, police, or insurance representatives.There were no warning lamps, messages, or other symptoms that I noticed prior to purchase, as the problem is related to a latent defect covered by the recall. The issue was UNKNOWN to me until the BMW dealer informed me after the purchase.In addition, the dealership engaged in other fraudulent practices, including structuring my full cash payment as self-financed (with themselves as both seller and creditor) and adding unauthorized charges, but the primary safety concern prompting this report is the undisclosed fire-risk recall.

NHTSA ODI 11709689

Working with the data? Download all 15 complaints as CSV · fetched from NHTSA July 20, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2021 BMW 4 Series Gran verdict →