For owners of the second-generation GMC Terrain, the years spanning 2014 to 2017 represent a period of significant ownership experience, often defined by specific 2017 GMC Terrain problems that range from minor inconveniences to serious safety concerns. While the crossover offered a modern design and capable efficiency for its class, a substantial number of complaints filed with regulatory agencies point to systemic issues that potential buyers and current owners need to understand. This overview details the most common and critical problems reported during this model period, focusing on the technical roots and real-world implications of these failures.
Electrical System and Infotainment Malfunctions
The most frequently reported category of 2017 GMC Terrain problems involves the vehicle's electrical architecture and user interface. Owners commonly experience glitches with the radio, including sudden volume resets, failure to retain presets, and complete system freezes that require a reset. These issues are often symptomatic of a deeper problem within the vehicle's Controller Area Network (CAN) bus, a central communication system that manages data flow between the radio, body control module, and other critical modules. When this data highway encounters errors, it can cause the loss of advanced driver-assistance features, such as lane-keep assist, which temporarily disables itself until the system is rebooted.
Battery and Parasitic Drain Issues
A subset of the electrical problems stems from a specific design flaw related to the battery cable termination. In some 2017 models, the positive battery cable can rub against the vehicle's chassis over time, wearing through the insulation and creating a constant parasitic drain or, worse, a short circuit. This not only leads to a dead battery but also poses a significant fire risk if the exposed wires ignite surrounding materials. Mechanics often inspect the cable's proximity to the steering column pinch weld during routine maintenance to identify this specific hazard before it leads to a complete vehicle breakdown.
Engine and Transmission Reliability Concerns
Under the hood, the 1.4-liter turbocharged engine, while efficient, became the center of attention for many 2017 GMC Terrain problems. The most severe issue involves the risk of engine failure due to catastrophic turbocharger problems. If the wastegate fails, it can cause excessive boost pressure that the engine internals cannot handle, resulting in bent valves, cracked pistons, and a total loss of power. This specific mechanical failure is often accompanied by a distinct rattling noise from the front of the engine and illuminated check engine lights, signaling immediate danger to the powertrain.
Transmission Hesitation and Failure
Complaints regarding the six-speed automatic transmission are equally prevalent, particularly concerning software calibration and physical wear. Many drivers report harsh shifting, severe lurching during acceleration from a stop, and unexplained slipping sensations. These symptoms are frequently linked to outdated transmission control module software that fails to manage the torque converter clutch properly. In more advanced cases, the issue progresses to complete transmission failure, where the vehicle loses the ability to move, often requiring a costly overhaul or replacement far before the expected lifespan of the component.
Fuel System and No-start Conditions
Another critical category of 2017 GMC Terrain problems involves the vehicle's ability to run consistently. A significant number of complaints detail sudden stalling while driving and an inability to restart the engine, commonly referred to as a "no-start" condition. The root cause is often a failure in the fuel pump relay or the multifunction control relay located in the under-hood fuse box. When these relays fail, they interrupt the electrical supply to the fuel pump, cutting off the supply of gasoline to the engine regardless of the fuel gauge reading.
