Vehicles with a 6speed automatic transmission may develop one or more of the following faults related to a broken 35R clutch wave plate inside the transmission: Illumination of the Check Engine Light with code P0716, P0776, P0717, P0777, P2714, P2715, and/or P02723, loss of reverse gear, slipping or harsh 3rd or 5th gear shift. Removal and dis-assembly of the transmission will be required to replace the broken 35R wave plate. It is also extremely important that all debris from the failed part be cleaned from the transmission while it is disassembled in order to try and prevent future problems.

Some GMC Acadia owners report experiencing persistent HID headlight issues even after changing multiple ballasts and bulbs. These problems may stem from loose or corroded wiring connections that disrupt the electricity flow to the HID bulbs, leading to inconsistent power supply and intermittent lighting. Additionally, faulty ballasts can cause irregular lighting output, making it crucial to verify their functionality. Owners also note that failing or damaged HID bulbs can contribute to flickering and irregular light output, emphasizing the importance of using high-quality bulbs. Moisture intrusion into the headlight assembly is another common concern that can negatively impact performance, requiring prompt attention. Lastly, some owners discover that a reverse polarity issue can prevent HID or LED kits from turning on, which can often be resolved by rotating the 2-pin oval connector on the HID ballast. Addressing these factors systematically can help troubleshoot and resolve HID headlight issues in the GMC Acadia.