According to Au7o's analysis of 1,500+ owner reports, the 2025 Mercedes-Benz A-Class has 2 documented known issues, with 1 rated critical. The most serious is Driver Door Lock Micro-Switch Corrosion Disables Auto-Park Brake (Rollaway Risk) ($0-$0 repair). The most commonly reported issue is MBUX Infotainment Software Bugs with 1,500 owner reports. DIY maintenance guides at au7o.io.
On the 2019-2025 Mercedes-Benz A-Class, the micro-switch inside the W177 driver's door lock uses a housing that does not meet Mercedes' moisture-robustness requirement (a supplier manufacturing deviation). Humidity permeates the plastic housing and corrodes the switch contacts, so the car no longer detects the driver's door opening. Because the electronic parking brake's 'Auto-Park' logic relies on that door-open signal to apply the brake when the driver exits with the transmission in D, a failed switch can leave a vehicle unsecured. Mercedes tracked 176 US field cases between 2020 and June 2026; owners usually first notice comfort functions misbehaving, most commonly the radio/MBUX staying on after they exit and lock the car, or the interior lights not reacting to the door. NHTSA recall 26V481 covers 310,667 vehicles across the A-Class, CLA, GLA, GLB, C-Class, GLC and CLE (2019-2026).
Common Symptoms
Radio or MBUX stays on after exiting and locking the car
Interior lights do not come on or go off when the driver's door opens
Electronic parking brake does not apply automatically when the driver door is opened in Drive
'Door open' warning missing or inconsistent
Seat-belt or key warnings behave as if the door never opened
How to Fix
Free recall remedy under NHTSA campaign 26V481000: an authorized Mercedes-Benz dealer replaces the driver's door lock with a unit meeting the moisture-robustness requirement. Dealers were notified July 31, 2026 and owner letters mail on or before September 18, 2026; owners who paid for a door-lock repair before the recall can apply for reimbursement. Until the repair is done, always shift to P and apply the parking brake manually rather than relying on Auto-Park. Outside the US the same lock is fitted, so European owners with 'radio stays on after locking' symptoms should ask the dealer to check the driver door lock (Türschloss) under the corresponding campaign.
On the 2019-2025 Mercedes-Benz A-Class, the MBUX infotainment system suffers from frequent software bugs including touchscreen lag, voice assistant failures ("Hey Mercedes" not responding), Bluetooth disconnects, and navigation freezes. The A-Class was the first Mercedes model with MBUX and received early software that was less polished.
Visit a Mercedes dealer for the latest MBUX over-the-air update. Factory reset the MBUX system (Settings > System > Reset). Re-pair all Bluetooth devices from scratch after the update.
Owner tips & cautions
TipCheck for MBUX updates quarterly. Mercedes pushes silent OTA updates but they sometimes require a dealer visit to install major version changes.
What are the most common Mercedes-Benz A-Class problems?
According to Au7o's analysis of 1,500+ owner reports, the 2025 Mercedes-Benz A-Class has 2 documented issues. The most frequently reported are: Driver Door Lock Micro-Switch Corrosion Disables Auto-Park Brake (Rollaway Risk), MBUX Infotainment Software Bugs. Of these, 1 is rated critical and should be addressed promptly.
Is the Mercedes-Benz A-Class reliable?
The 2025 Mercedes-Benz A-Class has 2 known issues documented across 1,500+ owner reports. 1 issue is rated critical: Driver Door Lock Micro-Switch Corrosion Disables Auto-Park Brake (Rollaway Risk). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Mercedes-Benz A-Class problems?
Repair costs for known Mercedes-Benz A-Class issues range from $0 to $500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Driver Door Lock Micro-Switch Corrosion Disables Auto-Park Brake (Rollaway Risk), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2019-2025 Mercedes-Benz A-Class Driver Door Lock Micro-Switch Corrosion Disables Auto-Park Brake (Rollaway Risk)?
The micro-switch inside the W177 driver's door lock uses a housing that does not meet Mercedes' moisture-robustness requirement (a supplier manufacturing deviation). Humidity permeates the plastic housing and corrodes the switch contacts, so the car no longer detects the driver's… Repairs typically run $0-$0. Severity: high.
What is the 2019-2025 Mercedes-Benz A-Class MBUX Infotainment Software Bugs?
The MBUX infotainment system suffers from frequent software bugs including touchscreen lag, voice assistant failures ("Hey Mercedes" not responding), Bluetooth disconnects, and navigation freezes. The A-Class was the first Mercedes model with MBUX and received early software that… Repairs typically run $0-$500. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
