In 1977, he raced for Tyrrell, driving the six-wheel Tyrrell P34B. Peterson retired from the opening four races of 1977, he spun off in Argentina, was involved in a crash with Jochen Mass's McLaren and Clay Regazzoni's Ensign in Brazil, and suffered fuel systems problems in South Africa and United States West. He finished eight in Spain but retired at Monaco with brake failure. Peterson's only podium finish was a third place at a rain-affected race in Belgium. Hopes were high at home in Sweden but Peterson retired with ignition problems and then finished 12th at France. He had an engine failure in Britain, finished ninth at Germany and got fifth in Austria. Peterson retired with ignition problems at Holland, sixth in Italy and 16th in the United States. Peterson retired from the last two races of 1977, a fuel leak in Canada and in Japan, he collided with Gilles Villeneuve's Ferrari but the crash killed a marshal and photographer as they were standing in a prohibited area of the track when the accident occurred.