2021 Chevrolet Blazer Reliability Score & Common Problems

Owners report frequent radiator failures in the 2021 Chevrolet Blazer, with multiple instances of leaks and cracks often occurring before 50,000 miles. Symptoms commonly include coolant leaks, overheating, and continuous fan operation, with some owners noting that these issues can lead to power steering assist problems and insufficient vehicle heating. Several complaints highlight the absence of warning lights for low coolant, which could increase the risk of engine overheating and potential fires. Additionally, some owners describe fuel pump module failures that cause the vehicle to stall or not start, with incidents reported as early as 18,000 miles. These issues may pose safety risks, particularly if they occur during highway driving or in remote areas.

Owners of the 2021 Chevrolet Blazer frequently report issues with the powertrain, particularly involving transmission failures and throttle body malfunctions. Common symptoms include vehicles stalling, entering limp mode, and failing to engage gears, which significantly impacts acceleration and driving stability. These problems are often reported around 28,000 to 90,000 miles. Some complaints also mention engine warning lights and diagnostic trouble codes, such as P2101 and P0796. Safety implications include the potential for loss of control when merging or turning, especially at highway speeds, as vehicles may unexpectedly lose power or stall. This information is crucial for used car buyers considering this model, as it highlights potential reliability concerns within the powertrain system.

Owners report frequent issues with the thermostat and cooling system in the 2021 Chevrolet Blazer, with complaints often describing the temperature gauge being stuck on cold, continuous operation of the cooling fan even when the vehicle is off, and the check engine light activating. These problems are sometimes accompanied by a lack of effective air conditioning and heating. The issues typically emerge around 40,000 to 60,000 miles, with some owners noting repeated thermostat replacements. Additionally, a few owners mention a leaking radiator and power liftgate malfunctions. While no direct safety incidents like crashes or fires are reported, the recurring nature of these issues, especially at relatively low mileages, may be of concern to potential buyers.

Owners of the 2021 Chevrolet Blazer frequently report issues with the fuel pump control module, leading to sudden vehicle shutdowns while driving. Symptoms commonly include the inability to accelerate, loss of power, and complete engine shutdown without warning lights. These problems often occur while the vehicle is in motion, with some reports indicating speeds of 45 mph and highway conditions. One report involves a crash in a parking lot due to a lack of steering and brakes after the engine died. Several owners mention being informed of a recall related to the fuel pump module, but note that parts are on backorder, with repair delays up to three months. These issues are reported in vehicles that have been in use for a few years, specifically around 2025.

Owners of the 2021 Chevrolet Blazer frequently report issues related to the suspension, with a common symptom being the vehicle pulling to the right during driving. Complaints also describe instances where the control arm required replacement, yet the issue persisted, indicating a recurring problem. One report involves a serious incident where a stability sensor issue led to a crash and injury, highlighting potential safety implications. These problems are noted at varying mileages, with one owner experiencing issues at approximately 34,980 miles. Buyers considering a used model should be aware of these reported issues, particularly the potential for loss of vehicle control.

Owners of the 2021 Chevrolet Blazer report issues related to water intrusion and fire incidents. Complaints frequently mention significant water accumulation on the front floorboards, leading to concerns about potential electrical problems and mold growth, despite no visible leaks during rain or car washes. Additionally, one report describes a fire that destroyed the front of the vehicle, indicating a serious safety risk. These issues do not specify mileage ranges, but the presence of water-related concerns and a fire incident are critical points for prospective buyers to consider.

Owners of the 2021 Chevrolet Blazer report issues related to the engine and engine cooling system, particularly around 63,000 to 95,000 miles. Common symptoms include persistent fan operation after the vehicle is turned off, intermittent A/C functionality, and abnormal sounds accompanied by coolant leaks. Additionally, oil leaks are noted, with diagnoses pointing to problems with the cam shaft carrier and issues in the transmission and oil cooler lines. While no safety implications such as crashes or fires are reported, these complaints highlight potential maintenance concerns for prospective buyers.