An intensified investigation into complaints of stalling engines has lead Toyota to recall over one million 2005-2008 Corolla sedans and Matrix wagons. The recall will also include 2005-2008 Pontiac Vibe vehicles. No other Toyota or Lexus vehicles are involved in the recall.

The problem is being blamed on an improperly manufactured engine control unit (ECU) which could lead to the check engine light coming on, hard shifting, the engine not starting or stalling while driving. Toyota has known about this problem since 2005 when it issued a technical service bulletin (TSB). At the time, if a customer came in with any of the above complaints, the ECU was replaced under warranty. If the warranty was up, it was left to the discretion of the dealership whether they would pay for it or not. Now that there has been an official recall the automaker will reimburse customers who paid for the fix.

Toyota and GM will mail owners notices starting in middle September. The ECU will be replaced on all of the recalled vehicles free of charge.