Oct 08, 2023

GMC Hummer EV Recalled For The Second Time Over Water Leak Issue

GM is still developing a fix for the GMC Hummer EV's latest water leak issue

The GMC Hummer EV has been hit with yet another recall and, once again, the all-electric BrightDrop EV600 is also involved.

General Motors has revealed that flanges on the battery pack enclosure may not have been properly primed or electrocoated, inhibiting proper adhesion of the urethane sealant. This fault could cause water to enter the battery pack enclosure and cause a battery pack malfunction.

The car manufacturer launched an investigation into the issue in August at roughly the same time a separate recall for the Hummer EV and BrightDrop EV600 was announced where water could enter through the A-pillar due to a corroded line connector.

Read: GMC Hummer Not As Waterproof As Hoped, May Lead To Electrical Issues

GM is aware of two field reports related to the issue and a report involving one of its test vehicles. In the field reports received by the automaker on June 27 and July 19, the vehicles would not start while in the third report, a test vehicle lost power during a test event at GM's Milford Proving Grounds on September 24, 2022. All three vehicles exhibited water leaks at urethane seals that had been repaired by the battery pack supplier during pack assembly.

The presence of water inside the packs triggered the vehicle's onboard diagnostics and the drivers received a notification about a battery-pack malfunction. No accidents, injuries, or fires related to the issue have been reported.

A total of 735 GMC Hummer EV models are involved in the recall, all of which were produced between November 9, 2021 and September 28, 2022. Additionally, 89 examples of the BrightDrop EV600 have been recalled which were manufactured from March 3, 2022 to June 24, 2022.

Dealers were notified of the recall on October 13 and owners will be notified on November 28, 2022. A remedy for the issue is still being developed.

Read: GMC Hummer Not As Waterproof As Hoped, May Lead To Electrical Issues