8 GMC Terrain Power Liftgate Problems (Troubleshooting Guide)

Owning a GMC Terrain should make life easier, but when the power liftgate malfunctions, it can quickly become a hassle.

Whether your liftgate fails to open, closes on its own, or makes unexpected noises, these issues can turn a convenient feature into an irritating one.

Here’s an in-depth look at the most common power liftgate problems GMC Terrain owners face—and how you can get it working smoothly again.

1. Liftgate Fails to Open or Close When Needed

Many owners find their liftgate unresponsive to commands from the key fob, interior button, or exterior handle.

Sometimes, the liftgate begins to move but stops mid-operation or reverses without warning. This problem is often seen in models from 2010 to 2017, though newer models aren’t immune.

Several possible causes could be to blame. A malfunctioning actuator or motor may be worn out or have electrical issues, impacting its engagement ability.

The liftgate control module, which manages liftgate functions, may suffer from software glitches or hardware failures.

Wiring problems, such as damaged or corroded harnesses, can interrupt the electrical signals necessary for liftgate operation. In some cases, blown fuses or relays related to the liftgate system render it unresponsive.

Owners of the 2012 Terrain have noted a complete lack of liftgate response after a battery replacement or a power outage, pointing to possible software resets or electrical surge impacts.

Some 2015 model owners report that the liftgate only works intermittently, sometimes requiring a full vehicle restart. The Driver Information Center may display warnings like “Power Liftgate Off” or “Liftgate Open,” adding to the issue.

Resolving this typically involves resetting or reprogramming the liftgate control module to clear any software glitches.

Dealerships often update the module software or perform a system reset to restore function. If the actuator or motor is at fault, these components may need replacement.

Technicians recommend checking all electrical connections for corrosion or damage, inspecting fuses and relays, and replacing them if needed.

2. Liftgate Opens or Closes on Its Own

Unexpected liftgate movement, whether opening by itself when parked or closing while loading, is another common issue, especially in Terrain models from 2010 to 2017. This issue can be concerning for security and safety.

This problem often stems from a faulty liftgate control module, which can send unintentional signals that move the liftgate.

Electrical shorts within the wiring or a defective key fob can also trigger unintentional liftgate movements. In rare cases, electronic interference from nearby devices may influence the system.

For instance, owners of the 2011 Terrain reported incidents where the liftgate opened by itself overnight, raising concerns about security and exposure to the elements. Some 2013 models have unexpectedly experienced liftgate closing during loading, creating safety risks.

Typically, resolving this issue involves examining and potentially replacing the liftgate control module. Technicians recommend inspecting the wiring for any signs of short circuits, and a replacement may be necessary if the key fob is responsible. For peace of mind, checking for the latest software updates can help address known software glitches.

3. Liftgate Doesn’t Stay Open or Closes Unexpectedly

Some Terrain owners report that their liftgate won’t remain open, sometimes closing without warning after reaching the top. This can be pretty bothersome when accessing cargo.

Worn gas struts, or lift supports, often cause these components to lose their ability to hold up the liftgate over time. Occasionally, a faulty liftgate motor or spindle may cause the liftgate to close unexpectedly.

Problems with the obstruction detection system, especially if it falsely detects an obstacle, may cause the gate to reverse.

Drivers of the 2010 Terrain have shared that colder temperatures make the liftgate drift downward, pointing to the gas struts’ reduced efficiency in the cold. Meanwhile, owners of the 2014 models report abrupt closures, leading to minor injuries while loading or unloading.

Replacing worn gas struts generally restores the liftgate’s stability. Additionally, inspecting the drive mechanism for faults or malfunctions can resolve unintentional closures. Ensuring the obstruction detection system is calibrated correctly reduces the likelihood of unexpected reversals.

4. Unusual Noises During Liftgate Operation

Noises like grinding, clicking, squeaking, or humming while the liftgate operates can signal deeper issues that may worsen over time. Typically noticed when opening or closing, these noises suggest wear in key components.

Worn gears or parts in the liftgate motor or actuator can cause these sounds as they begin to struggle under strain. Lack of lubrication in moving parts can also increase friction, causing noise. Loose bolts, brackets, or hinges sometimes misalign the liftgate and contribute to strange sounds.

For example, in 2012, Terrain owners reported grinding sounds that progressively worsened, eventually leading to complete liftgate failure.

Some owners of 2016 models notice squeaking noises, particularly in damp weather, hinting that environmental factors may exacerbate the issue.

Routine lubrication of gears, hinges, and other moving parts can reduce friction and quiet the liftgate. Replacing worn-out components like gears or bearings restores smooth liftgate operation, and ensuring all hardware is secure helps eliminate unwanted sounds.

5. Hands-Free Liftgate Feature Not Working Properly

Many newer GMC Terrain models include a hands-free liftgate feature, allowing users to open it by waving their foot under the bumper. However, some owners find this feature inconsistent or completely unresponsive.

Faulty or misaligned sensors are common culprits. Dirt, debris, or even damage around the sensor area can impact its performance, while software issues in the liftgate control module might also play a role. In some cases, aftermarket accessories near the sensor area can interfere with its operation.

For instance, in 2019, Terrain owners reported inconsistent responsiveness with the hands-free liftgate, while in 2020, model owners noted problems after adding trailer hitches or other rear accessories.

Keeping the sensor area clean and free of obstructions often improves performance. If necessary, recalibrating or replacing defective sensors helps restore the hands-free function. Also, updating the control module software may address issues originating from programming glitches.

6. Software Issues in the Liftgate Control Module

Some owners experience erratic liftgate behavior due to software issues within the control module. The liftgate may become unresponsive, exhibit unpredictable movement, or temporarily resolve itself after restarting the vehicle.

Software bugs within the control module, voltage fluctuations, or battery changes can cause data corruption and system glitches. Outdated software versions can also leave unresolved issues that are fixed in later updates.

For example, some 2013 Terrain owners notice that restarting the vehicle temporarily resolves liftgate issues, while owners of 2015 models report problems arising after a battery replacement or jump-start, suggesting power interruptions may impact module data.

Reprogramming the control module with updated software often resolves these issues, and dealerships can reflash the module if needed. A hard reset by briefly disconnecting the battery may help but not provide a long-term fix.

7. Liftgate Won’t Unlock with Central Locking

Some Terrain owners experience issues with their liftgate not unlocking when the central locking system unlocks the rest of the vehicle, making it inconvenient to access the cargo area.

A malfunctioning liftgate lock actuator, which may fail mechanically or electrically, could be the issue. Damaged wires or poor connections within the lock system could prevent signals from reaching the actuator. Also, malfunctions in the body control module (BCM) could disrupt the unlock command.

For example, in 2011, Terrain owners had to use the physical key to access the liftgate, while some 2014 models showed intermittent unlocking issues, making troubleshooting more challenging.

Replacing the liftgate lock actuator often resolves this, while checking and repairing any wiring issues within the liftgate circuit restores proper function. If the BCM is responsible, reprogramming or updating it may provide a solution.

8. Water Leaks Causing Electrical Problems in the Liftgate

Water leaking around the liftgate can lead to electrical malfunctions, including lighting issues and dashboard warnings. This is usually due to deteriorated weather seals or clogged sunroof drains that allow water to accumulate in the liftgate area.

Owners of the 2012 Terrain have reported finding moisture near the liftgate latch, while some 2016 models have experienced water pooling in the cargo area, causing electrical issues.

Replacing worn seals and clearing drainage blockages can prevent water intrusion. To restore liftgate function, damaged electrical components caused by water may need to be replaced.

Final Thoughts

While the power liftgate on a GMC Terrain can be a helpful feature, dealing with these common issues can turn it into a hassle.

Identifying the causes and taking steps to fix these problems can help maintain your liftgate’s convenience and reliability.

Whether it’s mechanical wear, electrical interference, or software bugs, early action can prevent further complications and keep your liftgate functioning as it should.