Power Tailgate Sensor Fault Stops Lift Midway on GL6

Had the exact same problem on a 2018 GL4. The power tailgate would stop halfway and flash an error on the dash. After inspection, it turned out the electrical sensor that monitors the tailgate position had a damaged wire harness. The tailgate motor was working fine, but the vehicle sensor was sending incorrect signals. The fix required removing the tailgate trim panel to access the wiring. The main issue was a corroded plug connection where water had seeped in over time. While not a major repair, it needed specialized diagnostic equipment to properly reset the tailgate control module after the repair. For safety, the system is designed to stop operation when it detects any sensor irregularities. This prevents potential damage to the power tailgate mechanism. A proper repair should include checking all connection points and possibly replacing any damaged wiring harness components. This is a known issue that usually appears after the 100k mark. Would strongly recommend having it properly diagnosed rather than attempting temporary fixes, as faulty sensors can cause more expensive damage to the tailgate motor if left unaddressed.

Thanks for sharing your experience. This is really helpful since my GL6 is showing the exact same symptoms with the hall sensor error. My local shop quoted pretty high for the repair but it sounds like it might just need the wiring harness replacement rather than a whole new tailgate motor assembly. Was your repair lasting, and do you recall roughly what you paid to get it fixed? Also curious if you had any other electrical sensor issues pop up since then? Want to make sure I address everything while its in the shop.

Just wanted to follow up on this, got the sensor calibration work done last week and it completely resolved the open tailgate issue. The repair was straightforward once they identified the faulty connection in the wiring harness. Total cost came to 95€ for fixing the damaged plug connection, which was much less than initially quoted for a full motor replacement. The vehicle sensor system has been working flawlessly since then. The automatic tailgate now opens and closes smoothly without any error codes. No other electrical issues have appeared in the 6 months since the original repair. The sensor wiring was the only problem that needed addressing. Make sure your shop checks the connection points specifically, in many cases, its just corroded wiring causing the fault rather than a complete sensor failure. A proper diagnostic scan should identify if its purely a wiring issue like mine was.

After hearing those replies, I took my car to the shop last week. The mechanic found the exact issue, a corroded wire in the tailgate sensor assembly. They cleaned the connections and replaced a small section of the wiring harness. The repair took about 2 hours and cost significantly less than the initial quote for a full motor replacement. The power tailgate now works perfectly with no error codes. They also performed a full sensor calibration to ensure everything was properly synchronized. So far, no other electrical issues have surfaced. Really glad I didn't immediately go for the more expensive motor replacement option they first suggested. The mechanic confirmed these sensor faults are pretty common once vehicles pass 100k miles, often due to water exposure over time. While the shop visit was initially nerve-wracking given my past repair experiences, this turned out to be a straightforward fix that saved me quite a bit of money.