2021 Chevrolet Suburban Reliability Score & Common Problems

Owners report multiple electrical system issues with the 2021 Chevrolet Suburban, including infotainment malfunctions, dead batteries, and erratic seat and mirror adjustments. Complaints frequently mention the vehicle going completely dead, sometimes while stationary, with one owner noting this occurred on a major highway. Symptoms such as black screens on infotainment systems, malfunctioning backup cameras, and warning messages about safety restraints are common. Mileage ranges from as low as 88,000 to over 107,000 miles, with several reports indicating these issues persist despite dealership visits. Safety implications are significant, as one complaint involves a fire with injuries, and others describe loss of power while driving, raising potential concerns for used car buyers regarding electrical reliability and safety.

Owners of the 2021 Chevrolet Suburban report several issues related to oil consumption and engine problems, with some mentioning excessive oil loss and engine failure. Affected vehicles often exhibit rough running or unexpected shutdowns, with one owner noting a pool of oil in a cylinder and requiring a new engine. Transmission and drivetrain concerns are also noted, with complaints about shaking, vibrations, and steering lock during acceleration, although inspections sometimes fail to confirm these issues. The reports include a crash incident where airbags did not deploy, raising potential safety implications. Mileage varies significantly, with some issues occurring shortly after purchase and others at higher mileages around 111,000 miles.

Owners report frequent issues with the braking system of the 2021 Chevrolet Suburban, primarily involving brake master cylinder failures. Complaints consistently mention symptoms such as hard brake pedals, loss of power braking, and various warning lights and messages like "Brake System Failure" and "System Brake Failure 43 MPH Top Speed." These issues often occur around 30,000 to 82,000 miles. One report includes a crash due to brake failure at low speed, highlighting potential safety implications. Buyers should be aware of these patterns, as they suggest significant braking performance concerns that could impact safety.

Owners of the 2021 Chevrolet Suburban frequently report issues with the fuel pump power control module, with symptoms including unexpected stalling and loss of motive power while driving, often without warning lights. These failures typically occur at mileages ranging from 30,000 to 90,000. Several complaints indicate difficulty restarting the vehicle after a stall, and in some cases, the vehicle requires towing. Safety implications are notable, as the loss of motive power occurs at various speeds and can lead to dangerous situations on the road. Buyers should be aware of potential part availability issues, as some owners mention delays in obtaining necessary replacement components.

Owners of the 2021 Chevrolet Suburban frequently report significant engine issues, including abnormal sounds such as ticking, knocking, and banging, as well as engine failure symptoms like loss of acceleration and excessive oil consumption. These issues are often linked to mechanical failures involving lifters, push rods, and valves, with some cases mentioning bent rods and piston damage. Complaints commonly arise around 107,000 to 132,000 miles, with some vehicles experiencing problems as early as 60,000 miles. Safety concerns are implicit, as engine failures and loss of power pose potential risks, especially in harsh weather conditions. Buyers should be aware of these mechanical issues and their potential impact on vehicle reliability and resale value.

Owners of the 2021 Chevrolet Suburban report issues with the airbag system, with incidents involving incorrect airbag deployment and non-deployment during crashes. A notable pattern includes airbags deploying unnecessarily due to false rollover detection, leading to vehicle shutdown during accidents, while another report describes airbags failing to deploy in a significant frontal collision. Common symptoms include persistent "SERVICE SAFETY RESTRAINT SYSTEM" warnings and improperly repaired airbags from previous deployments. These issues are reported to occur both shortly after purchase and during ownership, with one owner noting the problem immediately upon driving off the dealership lot. The safety implications are significant, with crashes and injuries reported, suggesting potential risks for used car buyers.

Owners report recurring issues with the air suspension system of the 2021 Chevrolet Suburban, particularly involving the vehicle's ride height and leveling system. Complaints frequently mention that the suspension system fails, causing the vehicle to lower to the crash shield or become uneven, which results in the vehicle speed being limited to 55-56 mph and a bouncy ride. One owner notes that the problem began within two weeks of purchase, while another describes ongoing issues despite multiple dealer visits and repairs, including replacing components like the air suspension arm and solenoids. Safety implications are evident, as one complaint involves a crash and describes an "explosion" sound followed by a sudden lowering of the vehicle, making it unsafe to drive. Used car buyers should be aware of these potential suspension issues and the challenges in obtaining a lasting repair.