2018 Mercedes-Benz CLA Reliability Report

Owners of the 2018 Mercedes-Benz CLA frequently report issues related to the transmission, with symptoms including the vehicle unexpectedly shifting to neutral and difficulties shifting between drive, reverse, and park. Complaints often describe incidents where the vehicle cannot be shifted into the desired gear without restarting the engine, and some report the vehicle entering limp mode or displaying error codes such as P073E. These problems are noted to occur at various mileage ranges, with some reports as early as under 1,000 miles and others around 83,000 miles. There are safety implications, as two complaints involve crashes, including one where the vehicle rolled back into another car after failing to engage park. Used car buyers should be aware of these transmission issues and the potential for unexpected loss of control while driving.

Multiple owners of the 2018 Mercedes-Benz CLA report issues related to the steering system, particularly concerning a recall for a defective nut in the steering column which could lead to steering failure. Complaints frequently mention delays in recall repairs due to unavailable parts, with some owners expressing frustration over the extended wait times. Additionally, there are reports of power steering malfunctions, where the steering ceases to function and warning lights illuminate, typically occurring around 8,000 to 34,000 miles. Safety implications are evident, with two reported crashes, one involving a complete loss of steering control leading to a collision with a wall and a guardrail, resulting in injury. These patterns suggest potential safety risks, especially considering the recall-related issues and the reports of steering failure without prior warning.

Owners report that the 2018 Mercedes-Benz CLA frequently experiences issues with the roof and sunroof components, including parts detaching while driving and sunroofs spontaneously exploding. Complaints frequently mention parts of the panoramic roof or sunroof panels disbonding, leading to water leaks and electrical failures. These issues often arise around 35,000 to 109,000 miles. Safety implications are noted, with one crash reported due to water ingress affecting the ABS system, and a roof spoiler detaching at high speeds, hitting another vehicle. Buyers should be aware of these potential structural issues and the associated risks.

Owners of the 2018 Mercedes-Benz CLA frequently report issues with the vehicle's braking system, primarily involving unexpected activation of emergency braking and persistent brake noise. Several complaints describe the brakes engaging without cause, sometimes bringing the car to a sudden stop, with one incident resulting in a crash and injury. Additionally, many owners report a recurring problem with squeaking or screeching brakes, often occurring at low speeds or in specific weather conditions, with symptoms appearing shortly after purchase and persisting despite repairs. Some owners also mention brake components wearing out prematurely, with issues noted around 9,000 to 20,000 miles. Safety implications are significant, with reports of loss of braking control and one documented crash, making these complaints relevant for potential buyers concerned about reliability and safety.

Owners report various airbag-related issues with the 2018 Mercedes-Benz CLA, including airbag warning lights illuminating at start-up and during operation, as well as airbags failing to deploy during crashes. Complaints frequently mention that the airbag warning lights are accompanied by malfunctions in other components, such as the horn and seatbelt sensors. Several owners describe airbags deploying unexpectedly or failing to deploy in collisions, leading to injuries, with reported incidents occurring at mileage ranging from 10,000 to 72,000 miles. Four crashes and four injuries are noted, highlighting potential safety implications for prospective buyers.

Owners report issues with the vehicle speed control system in the 2018 Mercedes-Benz CLA, with multiple complaints involving unintended acceleration and difficulties with adaptive cruise control. Symptoms include sudden acceleration while stationary or during low-speed maneuvers, as well as cruise control settings that cannot be cleared without turning off the engine. Some incidents have led to crashes, including one resulting in injury, and typically occur at varying mileages, with one incident reported at approximately 91,000 miles. These issues suggest potential safety concerns, particularly with loss of control and the risk of collisions, making it important for potential buyers to consider these factors when evaluating this model.

Owners report frequent issues with the positive crankcase ventilation (PCV) valve in the 2018 Mercedes-Benz CLA, often identified by the error code P052E. Symptoms typically include the check engine light illuminating, with some owners mentioning environmental pollution concerns due to the valve's failure. These problems are noted around 58,000 miles, although some are identified earlier. Additionally, a separate issue involves the fuel pressure sensor or wiring to the fuel pump control unit, leading to fuel bay door malfunctions and costly repair quotes. Safety implications include potential engine shutdowns during operation, as reported by one owner when the vehicle failed to restart promptly at a traffic signal.