GMC Acadia Common Problems

POWER TRAIN

Owners report that the 2018 GMC Acadia frequently experiences issues with the vehicle not recognizing when it is in park, leading to a persistent "shift to park" warning message. This problem often requires multiple attempts to shift in and out of park before the vehicle acknowledges the gear position, with some owners noting the need to restart the vehicle or disconnect the battery. Complaints often describe this issue occurring at various mileages, ranging from as low as 19,000 to over 100,000 miles. Safety implications are notable, with reports of the vehicle rolling when not properly engaged in park, contributing to three crashes and three injuries. Additionally, some owners experience transmission-related problems, such as shuddering during acceleration and complete transmission failure.

Severity signals: 3 crash, 0 fire, 3 injury reports

UNKNOWN OR OTHER

Owners of the 2018 GMC Acadia frequently report issues with the "Shift to Park" feature, where the vehicle fails to recognize it is in park. Common symptoms include persistent warning alerts, an inability to turn off the vehicle, and battery drainage due to the vehicle not shutting down completely. Many complaints indicate that resolving the issue often requires multiple attempts to shift in and out of park. These problems appear to persist across various mileage ranges, with some owners experiencing them shortly after purchase and others after several years. While no direct safety incidents are mentioned, the inability to secure the vehicle or potential for battery failure may pose indirect risks.

ELECTRICAL SYSTEM

Owners of the 2018 GMC Acadia frequently report issues with the "Shift to Park" defect, where the vehicle displays a message that it is not in park even when it is, preventing the vehicle from turning off and leading to battery drainage. Complaints often describe the need to repeatedly shift gears to resolve the issue, with some owners experiencing this problem shortly after purchasing the vehicle and continuing over several years. Additionally, there are reports of random engine shutdowns while driving, which pose a safety risk, especially on highways. These issues are noted at various mileages, with some owners mentioning the problem resurfacing after initial repairs. Potential buyers should be aware of these recurring electrical system issues, particularly the implications for battery life and vehicle operability.

Severity signals: 1 crash, 1 fire, 0 injury reports

ELECTRICAL SYSTEM

Owners of the 2021 GMC Acadia frequently report issues with the instrument cluster and infotainment system, with many experiencing the dashboard going completely black while driving, affecting the speedometer and other essential gauges. This issue often requires a software update, and some owners report recurring problems despite service interventions. Complaints also highlight failures in the fuel pump control module, leading to unexpected engine stalls while driving, sometimes at high speeds, which poses a significant safety risk. These electrical and fuel system issues are reported across a range of mileages, with some occurring as early as 5,000 miles. There are reports of crashes and injuries related to these failures, underscoring potential safety concerns for prospective buyers.

Severity signals: 2 crash, 0 fire, 1 injury reports

SERVICE BRAKES

Owners report frequent issues with the brake master cylinder of the 2025 GMC Acadia, often resulting in complete brake system failure. Typical symptoms include warning lights for "Service Brake Assist," "ABS," and "ESC," with some owners experiencing brake pedals going to the floor or becoming unresponsive. These issues commonly appear at low mileages, often under 8,000 miles, and are sometimes accompanied by electronic brake control module (EBCM) failures. Safety implications are significant, as several reports describe near accidents due to loss of braking power. Many owners also face extended vehicle downtime due to parts being on backorder, making this a critical consideration for potential buyers.

STEERING

Owners of the 2018 GMC Acadia frequently report issues related to the steering system, particularly involving messages like "Steering Assist Reduced" and "Shift to Park" errors. Symptoms often include reduced steering assist, difficulty shifting into park, and dashboard warnings, occurring at various speeds and sometimes when stationary. These issues are sometimes associated with faulty thermostat sensors, as noted by multiple owners. Safety implications are significant, with two reported crashes and five injuries linked to steering-related failures, including loss of control and erratic vehicle behavior. Complaints suggest these problems can arise early in the vehicle's lifespan, with some reports noting issues shortly after purchase.

Severity signals: 2 crash, 0 fire, 5 injury reports

POWER TRAIN

Owners of the 2020 GMC Acadia frequently report issues related to the powertrain, particularly with the transmission and torque converter. Common symptoms include shuddering, rough shifting, and unintended gear shifts, with some vehicles stalling or losing power unexpectedly. These issues often appear around 15,000 to 80,000 miles, with some owners experiencing complete transmission failure. Safety implications are evident, as several reports mention loss of power while driving, which could pose a risk in traffic. Buyers should be aware of these recurring transmission problems, as they may require significant repair costs.

ELECTRICAL SYSTEM

Owners report recurring electrical system issues in the 2020 GMC Acadia, with problems often emerging shortly after purchase. Common symptoms include malfunctioning door locks, lift gates, and key fobs, particularly after exposure to moisture, as well as frequent failures of the rear-view and backup cameras. Multiple owners describe complete instrument cluster failures, where all gauges and indicators drop to zero, and various electronic aids become disabled. Complaints frequently mention error codes such as U0422 and P0128, with some owners noting temporary fixes by disconnecting the battery. Safety concerns are highlighted by reports of unintended automatic braking, leading to a crash incident. These issues are reported across a range of mileages, often within the first few years of ownership.

Severity signals: 1 crash, 0 fire, 0 injury reports