The GMC Hummer EV Pickup is a complex and highly advanced vehicle, however despite the vehicle’s state-of-the-art tech, some owners have reported problems with a rather simple and straightforward component on the battery-electric truck: door lock and window switches.
According to a recent post on the GM Techlink service website, some 2022 GMC Hummer EV Pickup owners have reported that the vehicle’s driver-side door lock, window, and mirror switches suddenly stopped working. This condition may be caused by a leak in the A-pillar, which can allow water to enter the inside of the upper A-pillar and lead to corrosion on one of the in-line connectors for the driver-side door switches.
To remedy this problem, GM suggests dealer technicians open up the in-line connector in the driver’s side door (labeled #1 in the image below) and use a mirror to inspect the inside of the connector for corroded terminals. At this point, the technicians are instructed to clean the terminals and/or replace any damaged terminals as needed.
In addition, GM is instructing technicians to perform a water leak test on the A-pillar of affected vehicles. To do this, the technician will remove the air inlet grille to locate the seams where the A-pillar merges to the plenum panel and inner fender, re-seal the seams, and test for leaks. The image below shows a technician properly reapplying GM’s suggested sealant to this area to prevent further leaks.
GM also started a Customer Satisfaction Program for certain GMC Hummer EV Pickup models earlier this month due to an issue that may cause the high-voltage connector for the battery pack to corrode. This problem involving the driver-side door switches is not being addressed via Customer Satisfaction Program, however GM has issued a Service Bulletin to address the issue. A complete list of Service Bulletins for the 2022 and 2023 GMC Hummer EV Pickup can be accessed via the National Highway Traffic Safety Administration’s website.