2017-2025 XT5 & Acadia Liftgate Latch: Why It Fails & How to Fix It

Symptoms of a Failing Liftgate Latch

When the liftgate latch on your 2017-2025 Cadillac XT5 or 2017-2023 GMC Acadia begins to fail, the symptoms are usually obvious. Before you assume the motor is bad, perform this simple check:

If the switch is in the correct position, you may have a problem with the latch itself. Here are the most common signs:

• Liftgate Won't Fully Close: This is the most frequent complaint. The power liftgate lowers normally but stops when it hits the striker. It fails to pull itself shut, leaving a gap. 🎬 Watch a demonstration of a liftgate failing to close properly. It might even reverse and open back up slightly.
• 'Liftgate Ajar' Warning: A message will appear on the Driver Information Center (DIC) because the vehicle's computer doesn't see a closed-latch signal. This may also cause interior dome lights to stay on.
• Repetitive Beeping: The vehicle will often emit a series of beeps as an error alert when the liftgate fails to latch securely.
• Grinding or Clicking Noises: As the motor attempts to engage, you might hear grinding or rapid clicking sounds from the latch area in the liftgate. This often points to stripped or broken plastic gears inside the actuator assembly.
• Liftgate Won't Open: In some cases, the latch may fail in the closed position, preventing you from opening the trunk at all.

Known Issues, TSBs, and Diagnosis

While the latch motor can fail, many liftgate issues on the Cadillac XT5 and GMC Acadia are caused by a known electrical connection problem. Diagnosing this correctly can save you from buying a part you don't need.

TSB 20-NA-232: The First Thing to Check

General Motors issued a Technical Service Bulletin (TSB) for a very common issue on these vehicles. The problem presents as the liftgate stopping after opening only a few inches, or being inoperable when trying to close. This may also trigger the Diagnostic Trouble Code (DTC) B153F.

The cause is often not the motor or the control module, but bent or misaligned pins in the electrical connector for the liftgate object sensors. These sensors are located inside the liftgate, and a poor connection can trick the system into thinking there's an obstruction.

To check this:

1. Remove the upper trim panels on the inside of the liftgate to gain access to the wiring and connectors.
2. Locate the connectors for the left and right liftgate object sensors (B71L and B71R).
3. Disconnect them and carefully inspect the male pins for any that are bent or misaligned.
4. If you find a bent pin, carefully straighten it, reconnect the harness, and test the liftgate operation before reassembling the trim.

Diagnosing a Failed Latch Motor

If the TSB inspection doesn't solve the problem and your symptoms point to a failure to latch, the motor itself is the likely culprit. You can confirm this by listening to the latch as someone operates the close button. A click followed by silence suggests a seized motor, while a grinding noise indicates broken internal gears. You can also check for body-related DTCs; codes B3245 through B3249 specifically point to faults in the liftgate lock motor circuit.

Buying a Used Trunk Lid Pull Down Motor

A used OEM latch actuator is a cost-effective and reliable alternative to an expensive new part. Since these vehicles are relatively new, a used part from a low-mileage vehicle is likely to have plenty of life left. Here’s what to look for:

• Verify Compatibility: While many GM SUVs use this latch, stick to parts from a 2017-2025 Cadillac XT5 or 2017-2023 GMC Acadia to ensure a perfect match. Check the OEM part number against the list provided in this guide.
• Physical Inspection: Look for a clean part with no signs of water intrusion, rust on the electrical pins, or cracks in the plastic housing. The electrical connector should be intact with no broken tabs.
• Source Vehicle Mileage: Ask the seller for the mileage of the vehicle the part came from. Lower mileage is always better. A part from a vehicle with under 75,000 miles is an excellent choice.
• Return Policy: Only buy from sellers who offer a return policy. This protects you in case the part is faulty or doesn't solve your problem.
• Why Used OEM is a Good Choice: For a part like this, a used OEM unit is often superior to a cheap, new aftermarket part. The original GM part was designed and tested for the vehicle, ensuring proper fit and communication with the vehicle's electronics. Aftermarket versions can have lower quality internal components (motors, gears) that may not last as long.

Replacement Overview

Replacing the liftgate latch actuator is a straightforward job for a DIYer with basic tools. The process involves removing the inner trim panel of the liftgate, disconnecting the electrical connector and release cable, unbolting the old latch, and installing the new one in its place.

1. Open the liftgate.
2. Using plastic trim removal tools, carefully pry off the large interior trim panel on the liftgate. Start at the edges and work your way around, releasing the clips.
🎬 Watch this guide on how to safely remove the trim panels.
3. With the panel off, you will see the latch mechanism at the bottom center.
4. Disconnect the electrical harness from the latch.
5. Disconnect the manual release cable, if equipped.
6. Remove the bolts (usually three) holding the latch assembly to the liftgate.
7. Install the new latch and tighten the bolts.
8. Reconnect the electrical connector and cable.
9. Before reinstalling the trim panel, test the power liftgate function to ensure the new latch works correctly.
10. Snap the interior trim panel back into place.

Cost of Replacement

The cost to fix a failing liftgate latch can vary significantly depending on the cause and the parts you choose.

Frequently Asked Questions