The document said a bolt in the rear axle mount could break and cause the driveshaft to come loose, increasing the risk of the vehicle accidentally rolling away while parked with the parking brake not applied.
Affected vehicles include several 2020-2022 Explorer models, including the Explorer Hybrid and Explorer Plug-In Hybrid. Some 2020-2021 Explorer Police Interceptor SUV and Hybrid models are also subject to the recall.
The NHTSA said dealers will replace all necessary parts or update the electronic parking brake software for free. Owners are expected to be notified by post from June 6.
Ford did not immediately respond to a request for comment.