Mercedes-Benz · Known Issues
2021 Mercedes-Benz CLA Problems: 7 Known Issues
2021 model year · 700+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
2021 model year · 700+ owner reports · Updated September 2026
2021 · All trims · All engines
Choose the year and equipment for your written issues and visual request.
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According to Au7o's analysis of 700+ owner reports, the 2021 Mercedes-Benz CLA has 7 documented known issues, with 1 rated critical. The most serious is Driver's Door Lock Micro-Switch Corrosion Defeats Auto-Park Brake — Rollaway Recall 26V-481 (C118) ($0-$0 repair). The most commonly reported issue is Front Suspension Strut Noise with 700 owner reports. Across all issues with published estimates, repair costs range from $50 to $1,000. DIY maintenance guides at au7o.io.
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According to Au7o's analysis of 700+ owner reports, the 2021 Mercedes-Benz CLA has 7 documented issues. The most frequently reported are: Driver's Door Lock Micro-Switch Corrosion Defeats Auto-Park Brake — Rollaway Recall 26V-481 (C118), Water Leaks into Trunk and Rear Footwell (Vent Flap / Seam Sealing), Premature Rear Brake Wear and Caliper Piston Sticking. Of these, 1 is rated critical and should be addressed promptly.
The 2021 Mercedes-Benz CLA has 7 known issues documented across 700+ owner reports. 1 issue is rated critical: Driver's Door Lock Micro-Switch Corrosion Defeats Auto-Park Brake — Rollaway Recall 26V-481 (C118). 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.
Repair costs for known Mercedes-Benz CLA issues range from $0 to $1,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Driver's Door Lock Micro-Switch Corrosion Defeats Auto-Park Brake — Rollaway Recall 26V-481 (C118), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
NHTSA acknowledged on July 29, 2026 a Mercedes-Benz USA recall of 310,667 vehicles including 2020-2021 CLA 250, CLA 250 4MATIC, AMG CLA35 and AMG CLA45 (plus 2019-2022 A-Class, 2020-2026 GLA/GLB, 2022-2023 C-Class, 2023-2024 GLC and 2024 CLE). The housing material of the micro-sw… Repairs typically run $0-$0. Severity: high.
CLA owners report water collecting in the trunk and pooling in the rear footwells, sometimes enough to soak carpets and risk corrosion and electrical faults. A common path is poorly sealing rear pressure-relief vent flaps and water tracking down inside the trunk lid around the ta… Repairs typically run $50-$500. Severity: medium.
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.
CLA owners report rear brake pads and rotors wearing out before the fronts, with early 'Check Brake Pad Wear' warnings (some as low as ~50k miles) and rear rotor warping/vibration. A commonly cited root cause is the rear caliper piston sticking/dragging — a problem owners and ind… Repairs typically run $300-$900. Severity: medium.
Both CLA generations have been recalled three times for the telematics/communication module that places the automatic emergency call. 19V-787 (Nov 2019): on 2014-2016 CLA250, CLA250 4MATIC and CLA45 AMG (117 platform) a supplier software fault caused the module's GPS-derived date… Repairs typically run $0-$0. Severity: medium.
On second-generation CLA (118 platform) — 2020 CLA250 Coupe (10,277 US cars) and 2020-2021 AMG CLA35 and CLA45 — a rearview camera software deviation can leave the central display black when reverse is selected, so no rear image appears, violating FMVSS 111. Mercedes could not sy… Repairs typically run $0-$0. Severity: medium.
The front struts and strut mount bearings develop clunking and creaking noises over bumps. The CLA shares its platform with the A-Class and both suffer from the same strut mount bearing wear issue, especially on models with sport suspension. Repairs typically run $200-$1,000. Severity: low.
CLA owners frequently see an 'Auxiliary Battery Malfunction' message on the dash. The CLA uses a small secondary 12V battery to support electronics and the start/stop system; it typically degrades after roughly 4-6 years. A weak auxiliary battery, or a charging fault (alternator/… Repairs typically run $80-$400. Severity: low.