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2018 Yukon Denali Power Liftgate Not Opening/Closing Reliably

0

Mike T. · rep 0 · May 25, 2:42 AM · 1 replies · solved · Question

Vehicle: 2018 GMC Yukon Denali

Hello GMC community,

I own a 2018 GMC Yukon Denali, and I'm starting to have issues with the power liftgate. Sometimes it works perfectly, opening and closing smoothly with the remote or the button on the dash. Other times, it just won't respond at all, or it will start to open and then stop halfway, beeping at me.

It's become really unreliable, especially when I'm trying to load groceries or gear. I've checked for obstructions, but there's nothing in the way. Is this a common problem with the Yukon power liftgates? Could it be a sensor, the motor, or something else entirely?

Any insights into what might be causing this and how to fix it would be greatly appreciated. Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:42 AM

0

ClearTheCode admin answer:

Intermittent power liftgate operation is a common complaint across many SUVs and crossovers, and your 2018 GMC Yukon Denali is no exception. These systems rely on a combination of motors, sensors, and control modules, any of which can cause issues.

Common Causes:

  1. Faulty Liftgate Struts/Actuators: The hydraulic or electric struts that assist in opening and closing the liftgate can weaken or fail, leading to inconsistent operation.
  2. Obstruction Sensors: The pinch protection sensors, designed to prevent the liftgate from closing on an obstruction, can become overly sensitive, dirty, or faulty, causing the gate to stop or reverse.
  3. Wiring Issues: Frayed or broken wires in the liftgate harness (especially where it passes through the hinge area) can cause intermittent power or signal loss.
  4. Liftgate Control Module (LGCM): A malfunctioning control module can send incorrect signals or fail to process commands properly.
  5. Weak Battery: A weak 12V battery can sometimes cause electrical components to act erratically, as the liftgate motor draws significant power.

Steps for Resolution:

  1. Check for Obstructions & Clean Sensors: Thoroughly inspect the liftgate's path and the rubber seals for any debris. Clean any visible sensors along the edges.
  2. Manual Operation Test: Try to manually open and close the liftgate (if possible, with caution) to feel for any binding or resistance.
  3. Inspect Wiring Harness: Carefully examine the wiring bundle that runs from the body into the liftgate itself, often near the hinges. Look for any signs of wear, pinching, or broken insulation.
  4. Battery Check: Have your vehicle's 12V battery tested to ensure it's providing adequate voltage and cranking amps.
  5. Diagnostic Scan: A professional shop can connect a diagnostic tool to scan the Body Control Module (BCM) and the Liftgate Control Module (LGCM) for specific diagnostic trouble codes (DTCs). While not always OBD-II powertrain codes, codes like B2580 (Liftgate Control Module Malfunction) or B2575 (Liftgate Ajar Switch Circuit) can pinpoint the issue.

When to See a Shop:

  • If basic checks and cleaning don't resolve the problem.
  • If you suspect wiring damage or module failure.
  • If the liftgate completely stops working or becomes a safety hazard.
  • A dealership or a reputable auto electrical specialist will have the tools to diagnose the specific component failure and perform necessary repairs or replacements.
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