GMC Sonoma water leak at driver's door resolved by replacing weather strip on GMC Sonoma

Some GMC Sonoma owners report experiencing water leaks at the driver's door, which can result from a faulty door seal or a leaking door membrane. These leaks often manifest as water entering the cab from the bottom of the trim panel or running into the floorboard. To identify the source of the leak, some owners suggest using a water hose test, where a friend sprays water around the door while they observe from inside the truck. Additionally, checking drains and seam sealers, as well as clearing out drain holes in the door, can help prevent water accumulation. In some cases, owners may need to drill extra holes to ensure proper drainage, especially if existing holes are clogged. Regular maintenance, such as cleaning out drains after heavy rain, can further mitigate water buildup issues.