GMC Hummer not as waterproof as expected, may lead to electrical issues

General Motors is working to fix a pair of electrical issues that have plagued its recent EVs, including the GMC Hummer and Brightdrop EV600. Both are relatively minor, but both involve collecting water where it shouldn’t and could lead to more serious problems.

In July, GM issued a Technical Service Bulletin on model year 2022 GMC Hummers regarding electric gremlins around the doors, as first noticed by The reader. These can present themselves as problems with the power windows, door locks and exterior mirror control. Some customers may even experience unwanted activation of the burglar alarm system or messages in the infotainment system saying “service lockout”, for example.

According to GM, the defect stems from a line connector corroding due to water entering the upper A-pillar via panels that were not properly sealed. Service technicians will therefore perform a water leak test on suspected vehicles and repair or replace terminals as needed and add more sealant.

Also Read: The US Army Bought a GMC Hummer EV for Testing

The second question, about which we have already written, has been sketched in a Customer Satisfaction Program communication which was released on 1 August. It affects both the 2022 GMC Hummer and the 2022 BrightDrop EV600 and is a bit more serious.

Specifically, the high voltage connector can corrode and allow water to enter the high voltage battery. The fix appears to be fairly straightforward and requires techs to simply add more filler to the part. However, since the problem is related to the high voltage system, technicians are advised to exercise extreme caution when performing this fix.

Fortunately, the damage for this second issue is limited to only 424 vehicles. Both problems, meanwhile, should be relatively simple and inexpensive to fix.

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