New Ignition Switch Flaw Prompts GM to Recall Another 3.4 Million Vehicles

General Motors Co. is preparing a huge new recall to fix flaws in a second ignition switch that could cut power to the engine, thus disabling the airbags, power steering and power brakes.

The campaign involves nearly 3.4 million models built during the 2000-2014 model years and sold in the U.S., Canada and Mexico. The repair targets a different ignition switch design than the one that prompted GM to recall 2.6 million other vehicles in February.

But both switches are prone to the same problem. A sharp bump to the suspension can jolt both switch designs out of the "run" position, thus turning off the engine and cutting power to the airbags, power steering and power brakes.

The new recall covers Buick LaCrosse (2005-2009 models), Lucerne (2006-2011) and Regal LS/GS (2005) sedans; Chevrolet Impala (2006-2014) sedans and Monte Carlo (2006-2008) coupes; and Cadillac Deville (2000-2005) and DTS (2007-2011) large sedans.

Dealers will either replace the ignition key or add an insert that converts the key's keyring slot into a centrally positioned hole. The remedy is the same one GM offered nine years ago to fix the earlier ignition switch problem before deciding this year to replace the entire switch.

Ray DeGiorgio, the former GM engineer who approved the earlier switch, also was the signed off on the unit in the new batch of recalled cars, according to the company.