2018 Acura MDX Reliability Score & Common Problems

Owners report that the 2018 Acura MDX frequently experiences engine failures linked to connecting-rod bearing defects, with several complaints citing the recall (23V-751) as unresolved or inadequately addressed. Common symptoms include engine hesitation, reduced acceleration, stalling, and check engine light warnings, often appearing between 40,000 and 130,000 miles. Some complaints describe complete engine failure following prolonged recall-related delays, with one report involving a fire originating in the engine compartment, causing total vehicle loss and minor injury. Used car buyers should be aware of unresolved recall issues and potential safety risks, including fire and engine stalling.

Owners of the 2018 Acura MDX frequently report issues with vehicle speed control, primarily involving a delay in throttle response when accelerating from a stop or at low speeds. Typical symptoms include a lag of 1-3 seconds before the vehicle responds to the accelerator, often resulting in a sudden surge of acceleration. This issue is noted both at lower speeds and during high-speed freeway driving, with some owners experiencing a complete loss of throttle response. Complaints span various mileage ranges, with some starting as early as 50,000 miles. Safety implications are significant, as these delays and unexpected accelerations can lead to dangerous situations, particularly when merging or turning in traffic. Additionally, some owners describe problems with the cruise control engaging unexpectedly from a standstill, further contributing to potential safety hazards.

Owners of the 2018 Acura MDX frequently report issues related to the fuel system, particularly involving a recall for which parts are often unavailable. Complaints commonly mention symptoms such as engine hesitation, loss of motive power, and unexpected deceleration while driving. These issues are often reported around 40,000 to 100,500 miles. Some owners experience the vehicle stalling or failing to restart, with warning lights illuminating, though no crashes or fires are reported. Prospective buyers should be aware of potential fuel system faults and the possibility of extended wait times for recall repairs.

Owners of the 2018 Acura MDX frequently report issues with the vehicle's forward collision avoidance systems, including the Lane Keeping Assist System (LKAS), Adaptive Cruise Control (ACC), and Collision Mitigation Braking System (CMBS). Common symptoms include the illumination of multiple warning indicators on the dashboard, erratic system behavior such as abrupt disengagement of adaptive cruise control, and false collision alerts. Some owners describe sudden, unexpected deceleration, particularly when no obstacles are present, which poses a risk of rear-end collisions. These issues often occur shortly after purchase, even in certified used vehicles, and are sometimes linked to internal errors or overheating of the front multipurpose camera. Potential buyers should be aware of these reported safety implications, as they could affect driving confidence and vehicle operation.

Owners of the 2018 Acura MDX report issues primarily related to the vehicle's structure, including paint chipping on the tailgate and misalignment of the front passenger door, which allows rainwater to seep inside. The misalignment is identified as a factory defect, with moisture potentially impacting the vehicle’s electronics and causing mold growth, though specific effects are not detailed. A significant safety concern arises from a reported fire originating in the engine compartment shortly after parking, suspected to be due to a fuel line leak, with no prior warning signs. These issues are noted at varying mileages, with the water leak identified in a vehicle with only 20 miles. Buyers should be aware of potential structural defects and the serious safety implication of the fire incident.

Owners report steering issues with the 2018 Acura MDX, including difficulty turning the wheel and vibrations during specific speed ranges. Complaints frequently mention the steering wheel becoming hard to turn and shaking, particularly when making turns at lower speeds, with one report indicating this occurred at 49,000 miles. Another owner describes persistent steering wheel vibrations between 58-62 mph, worsening over time and becoming violent, even after attempts to resolve the issue through tire rotation and rotor replacement. The mileage associated with these vibrations starts as early as 500 miles and continues past 3,000 miles. While no crashes or fires are reported, the described symptoms may suggest potential safety concerns due to impaired steering control.

Owners of the 2018 Acura MDX report issues with the automatic braking system, with incidents occurring typically within the first few months of ownership. Complaints frequently mention the vehicle's brakes engaging unexpectedly, even when no immediate obstacle is present. One report describes the vehicle coming to a complete stop without any cars in front, while another details a crash resulting from the brakes activating suddenly, leading to a collision and two injuries. These incidents highlight potential safety implications, particularly involving loss of control and collisions. Buyers should be aware of these patterns when considering a used 2018 Acura MDX.