TuSimple Holdings Inc., a U.S.-based self-driving trucking company, faces federal investigations into whether it improperly financed and transferred technology to a Chinese startup, according to people with knowledge of the matter. The people said the concurrent probes by the Federal Bureau of Investigation, Securities and Exchange Commission and Committee on Foreign Investment in the U.S., known as Cfius, are examining TuSimple’s relationship with Hydron Inc., a startup that says it is developing autonomous hydrogen-powered trucks and is led by one of TuSimple’s co-founders.