Chevrolet Cruze, Chevrolet Equinox, Chevrolet Malibu, Chevrolet Tracker, Chevrolet Volt, GMC Acadia, GMC Canyon, and GMC Terrain vehicles, equipped with 4-cylinder engines (RPO LHN, LEX, L3A, LYX, LKN, LE2, LCV or LTG). On some vehicles, an electrical connection in the circuit board may fail in the engine control module.