Shares of Tesla (TSLA - Get Report) are down about 4% Thursday after analysts at Goldman Sachs downgraded the stock to neutral from buy and assigned a price target of $185, down from $240

The analysts are identifying some real problems with Tesla, TheStreet's Jim Cramer, co-manager of the Action Alerts PLUS portfolio, said on CNBC's "Mad Dash" segment. There are concerns over the upcoming Model 3 unit and about the potential acquisition of SolarCity (SCTY) . The deal has a lot of investors concerned, too, Cramer said. 

This downgrade could cast a big, dark shadow over the stock, he said. Goldman had been bullish on Tesla for a long time and has performed several deals for the automaker. 

Tesla is even being lumped into the general concern about self-driving automobiles, Cramer said. Tesla is forward thinking but is it forward thinking enough when it comes to self-driving cars? 

Meanwhile, the prospect of self-driving vehicles is doing good things for shares of semiconductor companies, Cramer said. 

This group remains so in demand that investors are still willing to buy stocks such as KLA-Tencor (KLAC - Get Report) and Lam Research (LRCX - Get Report) , even though both companies abandoned their merger Wednesday because of regulatory concerns. 

Both companies have more business than they can handle, according to Cramer. Applied Materials (AMAT - Get Report) is another company in high demand. Investors realize how strong the semiconductor cycle is right now, and that keeps them buying, Cramer concluded. 

At the time of publication, Cramer's Action Alerts PLUS had no position in companies mentioned.