According to a recent report from GM TechLink, the issue is present in certain units of the 2021 through 2022 Chevy Tahoe, as well as certain units of the 2021 through 2022 Chevy Suburban. Affected units may not open the rear window glass on the liftgate when using the switch on the liftgate or the button on the Remote Keyless Entry transmitter (better known as key fob).
The cause of the issue has been identified as the positioning of the rear wiper arm, which may not be fulled locked into the park position, thus preventing the back glass from opening. Note that the rear wiper arm may not be in the correct position, even if it looks as though it is.
It’s recommended that customers who experience this issue remove the rear wiper, then turn on the rear wiper motor. After allowing the rear wiper motor to cycle, turn it off. Next, reinstall the rear wiper arm and double check that the wiper is in the full park position, with the arm on the park ramp, which should enable the rear back glass to open.
If the rear window glass will still not open after cycling the rear wiper motor, it’s recommended that the rear wiper motor assembly is replaced.
As a reminder, new generations for both the Chevy Tahoe and Chevy Suburban nameplates were introduced for the 2021 model year, with the Chevy Tahoe entering its fifth generation, and the Chevy Suburban entering its twelfth generation. Three engines are offered for both SUVs, including the naturally aspirated 5.3L V8 L84 gasoline engine, naturally aspirated 6.2L V8 L87 gasoline engine, and 3.0L I6 LM2 turbodiesel Duramax engine. Both SUVs ride on the GM T1 platform, with production taking place at the GM Arlington plant in Texas.