Tesla is recalling nearly all of the vehicles it has sold in the U.S. because some warning lights on the instrument panel are too small.

The recall of nearly 2.2 million vehicles announced Friday by the National Highway Traffic Safety Administration is a sign of stepped-up scrutiny of the electric vehicle maker. The agency also said it has upgraded a 2023 investigation into Tesla steering problems to an engineering analysis, a step closer to a recall.

Documents posted Friday by the agency say the warning light recall will be done with an online software update. It covers the 2012 through 2023 Model S, the 2016 through 2023 Model X, the 2017 through 2023 Model 3, the 2019 through 2024 Model Y and the 2024 Cybertruck.

The agency says that the brake, park and antilock brake warning lights have a smaller font size than required by federal safety standards. That can make critical safety information hard to read, increasing the risk of a crash.