It all happened at about 2:49 p.m. along the 4500 block of FM 1960 E.
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The video above is ABC13's 24/7 Livestream.
Texas DPS said they were tipped off with credible information about the grenade, which may be linked to an ongoing investigation.
Authorities conducted a traffic stop and found the grenade in the vehicle. After that, the Harris County Sheriff's Office Bomb Unit responded but later rendered the item safe.
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The driver of the vehicle was taken into custody. Details regarding the second person charged were not immediately available.
This case remains under investigation.