2018 GMC Yukon Reliability Score & Common Problems

Owners of the 2018 GMC Yukon frequently report issues related to the brake vacuum pump, with symptoms including a hard brake pedal, reduced brake assist, and increased stopping distances. These problems typically occur at low speeds and during initial vehicle operation, with some owners experiencing a complete loss of braking capability. Complaints often mention the need for excessive pedal force and describe situations where the vehicle felt as if the brakes were engaged, leading to smoke and burning odors from the tires. One owner reports a crash due to the vehicle slowing but not stopping as expected. These issues are noted shortly after purchase or within a few years of ownership, suggesting potential early onset of brake-related problems.

Owners report frequent issues with the suspension system of the 2018 GMC Yukon, particularly involving leaking shocks and struts. Complaints frequently mention symptoms such as rough rides, excessive bouncing, and bottoming out, often occurring around 55,000 to 70,000 miles. Some owners describe difficulties finding replacement parts, with several noting that shocks and struts are on backorder, leading to extended vehicle downtime. While no crashes or fires are reported, the suspension problems can impact vehicle control, especially when towing, as noted by multiple owners. This information is crucial for potential buyers, as these repairs can be costly and time-consuming.

Owners of the 2018 GMC Yukon frequently report issues with the power steering system. Common symptoms include complete loss of power steering, often occurring after cold starts or when turning at low speeds, and difficulty turning the steering wheel, which can result in challenging driving conditions. Complaints often mention warning messages such as "Service Power Steering Drive With Care" and note the problem can persist even after multiple service visits, with some reports indicating the issue arises around 28,500 to 65,000 miles. Safety implications are apparent, as the loss of steering assist can lead to loss of vehicle control, particularly in parking or low-speed scenarios. Buyers should be aware of potential steering difficulties and the lack of a current recall addressing these reported issues.

Owners of the 2018 GMC Yukon frequently report issues with seat belt retractors, particularly in the second row, where they fail to retract properly or become damaged. Complaints describe seat belts that do not retract, with some belts showing signs of wear or cutting, potentially leading to breakage. One report involves a crash where the seat belt did not properly restrain a car seat, resulting in injuries. These issues often appear without any prior warning indicators and can occur at various mileage points, including as low as 26,755 miles. Safety implications are significant, as failure in seat belt function can increase the risk of injury in an accident.

Owners of the 2018 GMC Yukon report issues with the electrical system, primarily involving intermittent failures of the side rear brake lights and persistent alerts for the service trailer brake system. These problems are often described as occurring sporadically, with the brake light issue leading to a loss of power while driving. A serious incident is reported where a collision occurred, resulting in three injuries, and the airbags did not deploy, suggesting a possible fault in the airbag sensor. These complaints indicate potential safety risks, especially regarding the reliability of brake lights and airbag deployment in crash scenarios. No specific mileage range is consistently mentioned, making it unclear if these issues emerge at a particular point in the vehicle's lifespan.

Owners of the 2018 GMC Yukon report issues with airbag deployment during collisions, with two complaints involving crashes where airbags did not deploy as expected, resulting in injuries. One owner describes a collision with significant damage and no airbag deployment, while another reports side airbags deploying but not the front airbags during a crash that also involved a fire. Additionally, a complaint notes a Service SRS warning related to a faulty front passenger seat airbag control module at around 50,000 miles, though the vehicle had not been repaired. These patterns suggest potential safety implications, particularly regarding airbag functionality during accidents.

Owners of the 2018 GMC Yukon report issues with the air conditioning system, specifically citing failures in the A/C unit's functionality. Complaints frequently mention leaks in the A/C coolant line and holes in the A/C condenser as the primary causes of these failures. These issues are typically observed around 54,000 to 73,000 miles. While the primary concern involves the lack of cooling during high temperatures, no direct safety implications such as crashes or fires are reported. Used car buyers should be aware of potential A/C system failures and consider inspection of these components before purchase.