NEW YORK (TheStreet) -- Shares of Tesla Motors (TSLA) - Get Report  are down 0.23% to $243.25 in after-hours trading today as the company examines two possible theories to explain the May 7 fatal car crash involving a Tesla vehicle using its "Autopilot" system, Tesla told U.S. Senate Commerce Committee staff on Thursday.

The company is still trying to understand the system failure that led to the accident, Reuters reports.

Tesla's theories for the crash are that either the radar and camera input for the vehicle's automatic emergency braking system did not detect the truck trailer, or that the radar may have detected the truck but discounted it as part of the system's "tune out" feature to avoid false braking at structures like bridges and overhead road signs.

Tesla told the committee staff that it considers braking issues as separate from failures of its autopilot function.

The U.S. National Transportation Safety board is also examining the crash, but has not yet determined the probable cause.

Separately, TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author.

TheStreet Ratings rated this stock as a "sell" with a ratings score of D+.

The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, generally high debt management risk, disappointing return on equity, weak operating cash flow and generally disappointing historical performance in the stock itself.

You can view the full analysis from the report here: TSLA

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