Ticking under the passenger side dash when ignition is turned off.

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! That ticking sound under your dash is likely from a malfunctioning blend door actuator in the HVAC system. These little motors adjust air direction and temperature, and when they fail, they make that annoying tapping sound as their gears slip. The strange part is it shouldn’t affect starting your truck—but it might be triggering a relay or interfering with electrical systems near the ignition. Replacing the actuator should silence the ticking. If the no-start issue persists, look at related relays, the ignition switch, or even the truck’s Body Control Module (BCM), which might not be happy about the faulty actuator. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.