Automotive

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

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

In July, GM issued a technical service bulletin on 2022 model year GMC Hummers relating to electrical gremlins around the doors, as first noticed by The Drive. These may present themselves as problems with the power windows, the door locks, and the outside mirror control. Some customers may even experience unwanted activation of the anti-theft alarm system or messages in the infotainment system that read “service latch,” for example.

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

Read Also: The US Army Has Purchased A GMC Hummer EV To Test It Out

The second issue, about which we have previously written, was outlined in a Customer Satisfaction Program communication that was distributed on August 1. It affects both the 2022 GMC Hummer and the 2022 BrightDrop EV600 and is a little more serious.

More specifically, the high voltage connector can corrode and allow water to leak into the high voltage battery. The fix appears to be simple enough and asks technicians to simply add more sealant to the part. Since the issue is related to the high voltage system, though, technicians are warned to exercise extreme caution when performing this fix.

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

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