The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2017 Yukon SLT Power Liftgate Not Opening Reliably

0

Nicole W. · rep 0 · May 22, 3:48 AM · 1 replies · solved · Question

Vehicle: 2017 GMC Yukon SLT

Hey everyone,

I'm having a problem with the power liftgate on my 2017 GMC Yukon SLT. Sometimes it works perfectly, but other times it just won't open, or it'll open halfway and then stop. It's really inconsistent. I've tried using the button on the key fob, the button inside the car, and the button on the liftgate itself, and the behavior is the same across all methods.

There's no strange noise, just sometimes it doesn't respond or stops mid-way. Is this a common issue with Yukons of this generation? What could be causing it? I'm hoping it's not an expensive fix, but it's becoming a real hassle when loading groceries or gear.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:48 AM

0

Hi David,

Inconsistent operation of the power liftgate on your 2017 GMC Yukon SLT is a common complaint for many owners of this generation of GM SUVs. Several factors can contribute to this issue, ranging from simple adjustments to component failures.

Here's a breakdown of potential causes and what to look for:

  1. Common Causes:

    • Liftgate Struts/Actuators: The most frequent cause is weakening or failing power liftgate struts (also known as liftgate actuators). These units contain a motor and gas strut that assist in opening and closing. Over time, they can lose strength or develop internal electrical faults.
    • Obstruction Detection System: The liftgate has sensors to detect obstructions. If these sensors are faulty or if there's debris in the path, the system might stop the liftgate prematurely.
    • Wiring Harness Issues: Damaged or frayed wiring in the liftgate hinge area can interrupt power or signal to the liftgate motor.
    • Liftgate Control Module (LGCM): Less common, but the dedicated control module for the liftgate could be malfunctioning.
    • Low Battery Voltage: While less likely to cause intermittent issues, a weak vehicle battery can sometimes affect power accessory operation.

  2. Troubleshooting & Solutions:

    • Manual Check: Try to manually assist the liftgate when it's struggling. If it moves more easily with assistance, it points towards weak struts.
    • Inspect for Obstructions: Ensure there's nothing physically blocking the liftgate's path or caught in the seals.
    • Diagnostic Scan: A dealership or a shop with advanced diagnostic tools can scan the Body Control Module (BCM) and LGCM for specific trouble codes related to the liftgate. Common codes might include B1517 (Liftgate Motor Circuit) or B1518 (Liftgate Position Sensor Circuit), though intermittent issues might not always set a code immediately.
    • Strut Replacement: If the struts are confirmed to be weak, replacing both power liftgate struts is usually the solution. It's often recommended to replace them in pairs.

  3. When to See a Shop:

    • Given the intermittent nature and the safety aspect of a malfunctioning liftgate, it's advisable to have your Yukon inspected by a professional.
    • A GMC dealership will have access to specific diagnostic procedures and parts for your vehicle. They can accurately diagnose whether it's the struts, wiring, or a control module issue. This will ensure the correct repair is performed and prevent further frustration or potential safety hazards.
Menu

Help & account