Ford will release the software update for 4.3 million vehicles on March 17 via over-the-air, dealership or mobile service.

Ford recalls 4.3 million vehicles over a software problem that could cause trailer brake failure and a loss of exterior lights when towing.

Ford is recalling roughly 4.4 million vehicles due to a software issue that could cause an attached trailer’s tail lights, turn signals and brakes to fail — increasing the risk of crashing. The recall ...