2021 Mazda CX-30 Reliability Report

Owners of the 2021 Mazda CX-30 report issues with unintended acceleration and premature rear brake wear. Complaints frequently mention the vehicle accelerating unexpectedly, sometimes resulting in crashes, with one incident leading to an injury. The unintended acceleration incidents often occur during low-speed maneuvers such as parking, and in some cases, the brake pedal is reported as unresponsive. Additionally, multiple owners describe rapid rear brake wear, needing replacement within approximately 18 months of purchase. These issues are reported at mileages ranging from 22,000 to 31,000 miles. Safety implications include the potential for collisions due to loss of control, as evidenced by the reported crashes.

Owners report recurring issues with the power train of the 2021 Mazda CX-30, particularly involving low oil levels and transmission failures. Complaints frequently mention the illumination of low oil warning lights and subsequent confirmation of low oil levels, sometimes linked to valve seal assembly problems. Additionally, several owners describe sudden loss of acceleration or erratic acceleration behavior, often diagnosed as transmission failure, which poses safety risks when driving at highway speeds. Electrical complications, such as corroded wiring harnesses leading to engine malfunction warnings, are also noted. These issues are reported across various mileage ranges, with some occurring as early as 3 months into ownership.

Owners of the 2021 Mazda CX-30 report several issues, primarily concerning oil consumption and electrical warnings. Multiple complaints highlight a recurring problem with low oil levels, often occurring between 1,000 to 5,000 miles after an oil change, with some owners needing to add oil frequently, suggesting potential engine or turbo system issues. Additionally, several owners experience persistent "Low Battery Voltage" warnings, even when the vehicle is not in use, indicating possible electrical or software malfunctions. A few reports also mention impaired visibility due to sun visors not staying in place and issues with safety and driver support systems being partially disabled. No crashes or fires are reported, but the issues could lead to maintenance challenges and potential safety concerns for prospective buyers.

Owners of the 2021 Mazda CX-30 report issues with the vehicle speed control, particularly related to unexpected acceleration and difficulty in controlling speed. Complaints frequently mention the vehicle accelerating independently, sometimes resulting in crashes, as in two cases where the vehicle hit a building and a brick pillar. Symptoms include sudden lunging forward, hard acceleration when using adaptive cruise control, and failure to stop even when the brake pedal is depressed. These incidents occur at varying mileages, with one crash reported at approximately 1,000 miles and another at around 47,000 miles. Safety implications are significant, with one crash resulting in injuries, highlighting potential risks for prospective buyers.

Owners of the 2021 Mazda CX-30 report issues with the forward collision avoidance system, primarily involving unexpected emergency braking. In one instance, the system engaged without any obstruction, causing the vehicle to stop suddenly, though no crash occurred due to adequate spacing from other vehicles. Another complaint describes the automatic braking activating during a left turn at a signalized intersection, despite no immediate hazard, with the owner noting the presence of debris on the sensor. One significant incident involved a failure to stop while on cruise control, leading to a crash with injuries. These issues are reported around 14,000 miles, highlighting potential safety implications for prospective buyers.

Owners of the 2021 Mazda CX-30 report issues related to the seats, with a focus on seatbelt and seatback mechanisms. One complaint describes a driver seatbelt retractor failure, which prevents the seatbelt from retracting and could compromise safety in a collision due to the pretensioner not functioning. Another owner notes a loose seatback fold mechanism at only 23,000 miles, suggesting early wear or mechanical issues. These reports highlight potential safety concerns with the seatbelt and durability issues with the seatback, which prospective buyers should consider.

Owners report issues with airbag deployment in the 2021 Mazda CX-30, particularly during crashes. Complaints frequently mention that side and frontal airbags fail to deploy upon impact, even in severe collisions. In one case, the side airbags did not deploy during a crash that resulted in the vehicle being totaled, with two injuries reported. Another complaint describes frontal airbags not deploying in a separate crash, also resulting in a total loss and one injury. These incidents occur at mileage as low as 13,450, indicating potential early-life concerns. Safety implications are significant, with reports of crashes and multiple injuries, suggesting prospective buyers should consider these factors when evaluating this vehicle.