2020 GMC Acadia Reliability Report

Owners report frequent issues with the engine thermostat in the 2020 GMC Acadia, often resulting in engine codes such as P01F0 and P0128, and requiring thermostat replacement. Symptoms include the check engine light activation and unusual temperature gauge readings, typically occurring under 55,000 miles. Additionally, there are reports of exhaust leaks, particularly involving the catalytic converter and front exhaust pipes, with some incidents leading to exhaust entering the passenger compartment. These exhaust issues are noted around 58,000 to 60,000 miles and suggest potential safety implications due to exhaust fumes. Buyers should be aware of these engine-related concerns, especially regarding the thermostat and exhaust system.

Owners of the 2020 GMC Acadia report issues primarily related to the fuel pump and fuel gauge. Complaints frequently mention the vehicle unexpectedly losing power or failing to start, often attributed to a malfunctioning fuel pump relay or module, with some owners noting repeated failures around 24,000 to 50,000 miles. Additionally, several owners describe inaccurate fuel gauge readings, leading to situations where the vehicle runs out of fuel despite the gauge indicating sufficient levels. Safety implications include sudden power loss while driving, though no crashes or fires are reported. These patterns suggest potential reliability concerns for prospective buyers, particularly regarding fuel system components.

Owners of the 2020 GMC Acadia report issues with the seat belt locking mechanisms. Complaints frequently mention that the front driver's side and front passenger's side seat belts fail to remain latched, with some seat belts becoming unlatched while driving. Additionally, owners describe difficulty latching the driver seatbelt on the first few attempts. These issues are typically reported around 35,000 miles. While no crashes or injuries are mentioned, these problems could have safety implications due to the potential for seat belts to become unlatched during vehicle operation.

Owners of the 2020 GMC Acadia frequently report issues with the parking brake engaging unexpectedly. Typical symptoms include the parking brake activating automatically when the vehicle is parked on an incline or while driving, which can cause sudden stops without warning. One complaint notes this occurred at approximately 6,276 miles, but other reports do not specify mileage. These incidents may pose safety risks due to the unexpected nature of the braking, potentially leading to loss of control. Buyers considering a used 2020 Acadia should be aware of these issues and investigate whether the vehicle has been inspected or repaired for this problem.

Owners of the 2020 GMC Acadia report issues with the forward collision avoidance system, primarily involving unexpected activation and sensor malfunctions. Complaints frequently mention the automatic braking assist engaging without an apparent threat, causing sudden braking that could lead to rear-end collisions. Another common issue involves the front camera going dark, affecting the system's functionality. These problems occur without warning lights or messages, and some reports suggest the issues may become more frequent over time. The potential for unexpected braking raises safety concerns, particularly in scenarios where the vehicle could be rear-ended.

Owners of the 2020 GMC Acadia report issues with air bag functionality, with two complaints involving crashes where air bags failed to deploy. In one case, a rear-end collision resulted in injuries and unconsciousness due to non-deployment of air bags, with the vehicle having approximately 10,000 miles. Another complaint describes autonomous acceleration leading to a crash where air bags did deploy, but no injuries were reported. These patterns suggest potential risks related to air bag deployment and unintended vehicle acceleration, particularly in vehicles with relatively low mileage. Buyers should be aware of these reported issues when considering a used 2020 GMC Acadia.

Owners report recurring issues with the blind spot detection system on the 2020 GMC Acadia. Complaints frequently mention the "Service vehicle detection" and "SIDE BLIND ZONE SYSTEM TEMPORARILY UNAVAILABLE" messages appearing on the driver information center, indicating system failure. One owner notes the issue has persisted despite previous repairs, while another highlights the unreliability of the system, which began malfunctioning in December 2022. These failures raise safety implications as the system's unreliability could potentially lead to accidents if drivers rely on it for blind spot detection. Used car buyers should be aware of these reports, especially if considering a vehicle with similar timelines or service histories.