General Motors is recalling nearly 474,000 Chevrolet, Pontiac and Saturn cars to fix a transmission problem that can cause the cars to roll away unexpectedly.

The recall affects 2007-2010 Chevrolet Malibus, Pontiac G6s and Saturn Auras in the U.S., Canada and Mexico as well as a small number of exports. All the cars have four-speed automatic transmissions.

GM says part of the transmission cables can break. When this happens, the shifter can show that the car is in park when it's really in gear. GM says it knows of four crashes from the problem but no injuries.

Dealers will put a retainer over the end of the cables or replace them. Owners will be told by letter when to set up appointments with dealers.