Elon Musk Tweets Tesla Self-Driving Rollout Could Take A Couple Of Months; Stock Falls

Tesla Inc's top boss Elon Musk said Tesla is tweaking its self-driving software to eliminate a phantom braking problem and may release a significantly improved version within the next two to three weeks.

Tesla Inc's top boss Elon Musk said Tesla is tweaking its self-driving software to eliminate a phantom braking problem and may release a significantly improved version within the next two to three weeks. Tesla shares fell 2.7% to $600.42 in morning trade, headed for a third straight decline. U.S. federal and state regulators have been scrutinizing Tesla's semi-automated driving system following accidents in Texas and other areas. "I think we're maybe a month or two away from wide beta. But these things are hard to predict accurately," Musk said in a Tweet. In April, Musk said he would be "surprised" if wide beta service was available later than June, calling a May launch "aspirational."