NHTSA Complaint #10305131 — 2007 TOYOTA SIENNA

2007 TOYOTA SIENNA: TRANSMISSION TEMPORARILY FAILS TO ENGAGE THE CORRECT GEAR AFTER DECELERATING THEN RE-ACCELERATING RESULTING IN A PAUSE OR HESITATION BEFORE CONTROL IS AGAIN REGAINED. THIS OCCURS MOST FREQUENTLY WHEN SLOWING FOR TURNS AT INTERSECTIONS OR BEHIND SLOWING TRAFFIC OR ATTEMPTING A LANE CHANGE. THREE SERVICE CALLS HAVE BEEN MADE ON THE VEHICLE WHICH WERE RECORDED AS A "BAD ECU PROGRAM". SERVICE TECHNICIANS "REPROGRAMMED THE ECU" TO "RESET ADAPTIVE MEMORY AND SHIFT POINTS" HOWEVER THERE WAS NO CHANGE IN PERFORMANCE. IT WAS SUGGESTED THAT THIS WAS A DESIGN PROBLEM WHICH HAD BEEN CORRECTED IN LATER MODEL YEARS. THE POTENTIAL CONSEQUENCES OF THE TRANSMISSION'S FAILURE TO IMMEDIATELY ENGAGE IN THE CORRECT GEAR ARE THE LOSS IN ABILITY TO QUICKLY ACCELERATE OUT OF A PENDING COLLISION OR TO AVOID SLOWING IN THE MIDDLE OF AN INTERSECTION AND CAUSING OTHERS TO HAVE COLLISIONS. *TR