Common problems

Mercedes-Benz CLA Common Problems

We grouped the top NHTSA owner-complaint categories across 7 Mercedes-Benz CLA model years, then counted how often each issue recurs. The result shows patterns worth inspecting without pretending every vehicle will have them.

Data updated April 2026

Owner complaints
1,775

7 model years

Top recurring issue
Electrical System

6 affected years

Crash reports
89

Owner-reported severity signal

Fire reports
41

107 injuries · 1 deaths

Pattern overview

Most reported Mercedes-Benz CLA problem categories

#1

Electrical System

304complaints represented

Appears among the leading issues for 6 model years; highest in 2019.

#2

Unknown Or Other

220complaints represented

Appears among the leading issues for 6 model years; highest in 2018.

#3

Engine

207complaints represented

Appears among the leading issues for 5 model years; highest in 2018.

#4

Power Train

117complaints represented

Appears among the leading issues for 5 model years; highest in 2018.

#5

Structure

51complaints represented

Appears among the leading issues for 3 model years; highest in 2019.

#6

Steering

62complaints represented

Appears among the leading issues for 2 model years; highest in 2018.

#7

Exterior Lighting

8complaints represented

Appears among the leading issues for 2 model years; highest in 2021.

#8

Fuel System, Gasoline

28complaints represented

Appears among the leading issues for 1 model year; highest in 2022.

#9

Seat Belts

25complaints represented

Appears among the leading issues for 1 model year; highest in 2019.

#10

Back Over Prevention

11complaints represented

Appears among the leading issues for 1 model year; highest in 2020.

What owners reported

Issue summaries by Mercedes-Benz CLA model year

ELECTRICAL SYSTEM

Owners report frequent issues with the 48V hybrid battery in the 2021 Mercedes-Benz CLA, often leading to sudden loss of power and vehicle stalling. Symptoms commonly described include warning lights for battery and engine malfunctions, smoke, and in some cases, fires. These problems typically arise within the first few thousand miles, with some owners mentioning occurrences as early as 3,400 miles. Safety implications are significant, with reports of crashes, fires, and near-miss incidents due to sudden deceleration. Prospective buyers should be aware of these recurring electrical issues and their potential impact on vehicle safety and reliability.

Severity signals: 1 crash, 5 fire, 3 injury reports

ELECTRICAL SYSTEM

Owners of the 2019 Mercedes-Benz CLA frequently report issues related to the electrical system, with common problems including unintended acceleration and loss of motive power. Symptoms often described include warning messages such as "Malfunction" appearing on the display, vehicles accelerating by themselves, and instances where the vehicle fails to detect the key fob, leading to sudden power loss. Complaints also highlight issues with the instrument cluster, such as random shutdowns affecting visibility of critical driving information. Notably, five complaints involve vehicle fires, some occurring spontaneously while the car is parked, and two reports mention injuries. These issues are reported at various mileage points, with some occurring as early as 20,000 to 35,000 miles, indicating potential safety implications for prospective buyers.

Severity signals: 0 crash, 5 fire, 2 injury reports

ENGINE

Owners report frequent issues with the crankcase ventilation valve in the 2018 Mercedes-Benz CLA, often identified by the recurring diagnostic code P052E. Symptoms commonly include the check engine light illuminating, oil leaks, and engine stalling, with some instances leading to complete engine failure. These problems typically appear around 30,000 to 70,000 miles. Safety implications are highlighted by reports of engine fires and incidents where the vehicle suddenly loses power, resulting in a risk of collisions. Buyers should be aware of the potential for significant repair costs and possible safety hazards associated with these engine issues.

Severity signals: 0 crash, 2 fire, 1 injury reports

UNKNOWN OR OTHER

Owners of the 2019 Mercedes-Benz CLA frequently report issues with the crankcase ventilation system, specifically citing error code P052E related to the PCV valve, which often occurs shortly after the warranty expires, around 50,000 to 58,000 miles. Complaints also commonly describe sudden sunroof explosions while driving, with no prior impact or warning, leading to shattered glass inside the vehicle. Additionally, unresolved recall notices and communication failures from dealerships are noted, with some owners experiencing difficulty in obtaining necessary repairs. Safety concerns are highlighted by reports of a vehicle malfunction leading to an inability to stop, resulting in a crash, and another incident involving a fire. Potential buyers should be aware of these issues, particularly regarding the sunroof and crankcase ventilation system, which appear frequently in owner reports.

Severity signals: 2 crash, 1 fire, 1 injury reports

ENGINE

Owners of the 2021 Mercedes-Benz CLA frequently report engine issues, particularly involving cylinder misfires and cylinder head failures. Typical symptoms include the check engine light illuminating, rough idling, loss of power, and engine stalling, sometimes with no warning. These issues are often reported around 35,000 to 100,000 miles, with some owners experiencing failures as early as 22,000 miles. Safety implications are evident, with reports of the engine shutting off unexpectedly, posing risks during driving, although only one incident involves a crash. Buyers should be aware of potential high repair costs and recurring issues noted by multiple owners, especially concerning the M254 and M264 engines.

Severity signals: 1 crash, 0 fire, 0 injury reports

UNKNOWN OR OTHER

Owners of the 2018 Mercedes-Benz CLA frequently report issues with the panoramic sunroof, including spontaneous shattering and failure to operate properly, with some incidents occurring while driving. Multiple complaints also highlight a recurring problem with the Positive Crankcase Ventilation (PCV) valve, often indicated by the check engine light and error code P052E, with some owners noting this issue arises under 50,000 miles. There are reports of safety concerns, including a crash involving hydroplaning where the vehicle's brake assist system activated unexpectedly, and two incidents involving fires. These patterns suggest potential safety implications, and prospective buyers should be aware of these commonly reported issues.

Severity signals: 2 crash, 2 fire, 1 injury reports

ELECTRICAL SYSTEM

Owners of the 2018 Mercedes-Benz CLA frequently report issues with the electrical system, particularly involving the steering wheel controls, backup camera, and battery drain. Common symptoms include steering wheel buttons and horn becoming inoperative, backup cameras intermittently failing, and vehicles not starting after being idle for a few days. Some complaints indicate that these issues occur around 50,000 to 85,000 miles. Safety implications are notable, with three reports of crashes and one injury associated with electrical malfunctions, including unintended acceleration and airbag deployment failures. These patterns suggest potential risks for used car buyers considering this model.

Severity signals: 3 crash, 0 fire, 1 injury reports

ELECTRICAL SYSTEM

Owners report several recurring electrical issues with the 2022 Mercedes-Benz CLA, particularly involving the 48-volt battery system, which frequently malfunctions and leads to engine shutdowns while driving. These incidents often occur without warning and are sometimes accompanied by overheating warnings, impacting vehicles even with low mileage around 3,500 to 25,000 miles. Complaints frequently mention the car stalling or losing power unexpectedly, posing significant safety risks, especially on highways, and in some cases, these failures have resulted in crashes and fires. Additionally, multiple reports describe problems with fuel sensors inaccurately displaying fuel levels, leading to unexpected vehicle shutdowns. Buyers should be aware of these potential issues and the associated safety implications when considering this model.

Severity signals: 2 crash, 2 fire, 2 injury reports

Pre-purchase inspection

What to check on a used Mercedes-Benz CLA

When problems are reported to begin

  • Electrical system failures — 0–10,000 miles on the 2024 model-year record
  • Transmission shudder — 25,000–35,000 miles on the 2024 model-year record
  • Steering vibrations — 3,000–19,000 miles on the 2022 model-year record
  • Electrical system failures — 3,500–25,000 miles on the 2022 model-year record
  • Forward collision avoidance issues — 1,500–8,000 miles on the 2022 model-year record
  • Transmission failures — 15,000–22,000 miles on the 2021 model-year record
  • Cylinder head failures — 35,000–50,000 miles on the 2021 model-year record
  • 48V battery failures — 196–3,400 miles on the 2021 model-year record

Buyer red flags

  • Test infotainment system for freezing or black screens during operation
  • Inspect sunroof for signs of stress or potential shattering
  • Check for unexpected seat movement while driving
  • Examine tires for bubbles or sidewall damage
  • Verify braking system functionality, especially for unintended acceleration
  • Ensure vehicle does not shift unexpectedly from drive to neutral
  • Test steering for vibrations at moderate to high speeds
  • Inspect for any electrical system warning lights or malfunctions

How to interpret the counts

Complaint totals are not failure rates

A popular or older model can accumulate more complaints simply because more vehicles exist and have spent longer on the road. The categories above aggregate the counts embedded in each model year's leading issues. Use recurrence across years and severity signals to decide what to inspect; use the VIN and a mechanical inspection to judge one car.

Source trail

Where this Mercedes-Benz CLA data comes from

VinExposed combines model-level research with the vehicle-specific history you get from a VIN. Reliability scores and complaint patterns come from Auto Reliability Index's Mercedes-Benz CLA research, which analyzes NHTSA records and independent repair data.

Recall counts describe a model year, not the repair status of one car. Confirm the exact VIN with the official NHTSA recall lookup and a vehicle-history report before buying.

Buyer questions

Mercedes-Benz CLA research FAQ

What is the most common Mercedes-Benz CLA problem?

Electrical System is the broadest recurring complaint category in the available model-year records, appearing among the top issues for 6 years with 304 complaints represented.

Which Mercedes-Benz CLA year has the most reported problems?

The 2019 has the largest electrical system count among the years where that category appears. Compare the full year record because a different year may lead on another problem category.

Do NHTSA complaints prove a Mercedes-Benz CLA has a defect?

No. Owner complaints are unverified reports and can be duplicated or influenced by sales volume and vehicle age. They are useful patterns to investigate alongside recalls, service records, inspection results and the exact VIN.

Check the actual car

Model research narrows the list. The VIN confirms the car.

Check title brands, accidents, odometer history, auction records and recall status for the specific Mercedes-Benz CLA you are considering.