2020 BMW 330I: check engine light

Filed Sep 29, 2026 · Driver assistance, Electrical · SC

Several months ago, my digital cluster on my 2020 330i blacked out briefly and came back on. The other day, after temporarily disconnecting the batter and correctly reconnecting, the digital cluster and driver assist items all failed. Because of this failure, I no longer have access to my speedometer, engine temperature, or engine lights in the event that something needs immediate attention. Not having the speedometer requires me to check my speed using a GPS device would causes me to divert my attention from the road which is a hazard to pedestrians and drivers alike. I also do not have the driver assist items which can result in an accident which would injure both myself and other drivers. The cluster has not returned to being functional, which was confirmed by the dealership after completing a full ISTA troubleshooting tree. There were no warnings that this would happen, it just immediately died after a power cycle of the battery.

Filed Dec 19, 2025 · Body, Driver assistance · PA

Within days of purchasing the vehicle, multiple warning lights and safety-related alerts appeared, including repeated check engine warnings, an alert stating “Driver Assistance Support Reduced,” and a wrench indicator referencing an auto lighting and wiping system malfunction. While driving, the vehicle felt unstable and would sway side to side, making it difficult to maintain confident control. The vehicle was brought in for service shortly after purchase due to these concerns and was removed from my possession because of the seriousness of the issues. During the service process, I was informed that the vehicle had previously been involved in an accident and that a critical structural safety component (the front crash bar) was damaged. This damage had not been disclosed prior to purchase. The crash bar is a key part of the vehicle’s body structure designed to absorb impact and protect occupants in a collision. Driving a vehicle with damage to this component posed a potential safety risk. The combination of structural damage, reduced driver assistance alerts, visibility system warnings, and unstable handling raised concerns about crash protection, vehicle control, and overall safety. The issues were identified by the selling dealer during inspection after the vehicle was returned for service and are available for further inspection if requested.

Filed Jan 23, 2025 · Driver assistance, Electrical · OR

The vehicle has persistent issues with its software and safety systems, creating significant safety risks. The Remote Software Upgrade feature fails to install, despite indicating it is “ready to install” with preparations complete. This prevents critical updates that could address safety and performance defects. BMW Customer Support was unable to resolve the issue, and a local dealership confirmed no hardware faults but could not address the software issue due to limitations as a non-BMW-certified service center. Several critical safety features also do not function properly. The Blind Spot Warning system has never issued alerts, leaving the driver unaware of vehicles in adjacent lanes. The Forward Collision Warning system has never activated, even in close proximity to other vehicles. The Lane Departure Warning fails to consistently activate, while Lane Keeping Assistance operates only intermittently, despite being designed to engage above 40 mph. Additionally, the Parking Collision Warning and Rear Cross Traffic Warning systems have never provided alerts, even when obstacles or approaching vehicles are present. These malfunctions severely compromise the vehicle’s ability to prevent accidents and ensure safety. The vehicle also intermittently displays drivetrain failure warnings, stating the car can still be driven but should be serviced. Upon inspection, no issues were identified. Consistent fault codes for the active kidney grille shutters appear, but no check engine light is illuminated. These recurring warnings create uncertainty about the vehicle’s reliability and the accuracy of its diagnostics. The combination of these issues places the driver, passengers, and others at risk. A thorough investigation is needed to identify and resolve the root causes. All systems are available for inspection upon request.

Filed Dec 20, 2024 · Engine · TX

Error in vehicle computer software causing check engine light to show error in active grill position sensor, could lead to engine not properly cooling. Manufacturer error.

Filed Mar 6, 2024 · NC

The lower active grill on my 2020 BMW 330i failed. I purchased the vehicle on January 24th. On February 27th, the check engine light came on. I called the dealership I bought it from. They told me they did not have the necessary technology to diagnose, so I took it to a BMW mechanic. The mechanic told me it is a known warranty issue with this particular BMW, and that BMW should fix it for free under the limited warranty bulletin. When I tried to contact BMW about this issue, they refused to pay for it stating that my specific VIN number was not affected by this issue, and therefore they wouldn't pay for it. This makes no sense seeing as it is a clearly known issue with an active bulletin out for the same exact year make and model as my vehicle. The production clearly did not change enough to fix the issue, so my vehicle should be included in the limited warranty/recall. The flaps can get stuck closed, which can cause the car to overheat quickly, which can be extremely unsafe. BMW refused to even look at the vehicle to see if the issue was in fact the warranty issue without me paying a $250 diagnostic fee, when I had just paid to have it diagnosed at a different BMW mechanic.

Filed Apr 25, 2023 · Fuel system · VA

The check engine light comes on every time there is low fuel in tank. BMW will not address the issue even though there is previous recalls on earlier years. Please recall before someone is hurt or killed.