what makes a small motor or pump sound from lower left undercarriage?

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! A small motor or pump sound from the lower left undercarriage of your 2022 Hyundai Tucson could be a few things, especially if it just happened once and stopped on its own. It might have been related to a part of the vehicle that operates intermittently, like the fuel pump, an exhaust component, or a part of the cooling or emissions system. One common culprit could be the **fuel pump**, which can sometimes make a faint humming sound when it's operating. However, if it’s only heard on occasion and then stops, it’s less likely to be a persistent issue with the fuel pump itself. Another possibility is something related to the **cooling system**—like a fan or a cooling pump—particularly if you’ve been driving in warmer weather or idling for a while. These parts can kick on and off as needed to keep things at the right temperature. Lastly, **ventilation or air conditioning components** can also make motor-like sounds, especially if the system has an automatic mode that kicks in after the engine is warmed up. If the sound doesn’t come back, it could have just been a temporary noise from a system cycling through its normal operation. But if it does, it would be worth investigating further at a trusted shop. 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.