NHTSA Complaint #11245382 — 2012 HYUNDAI SONATA

DRIVING AT INTERSTATE SPEEDS, WILL DOWN SHIFT AND DRASTICALLY LOSE SPEED WHILE IN BLUE MODE. NO WARNING LIGHTS OF ANY KIND. NO APPARENT ISSUE AT LOWER SPEEDS. ENGINE DOES NOT REV UP HIGH BECAUSE OF REV LIMITS. DROPS FROM 6 GEAR DOWN TO 4 GEAR QUICKLY LOOSING SPEED. LEADING TO IMPEDANCE OF TRAFFIC FLOW. A COUPLE OF TIME THIS HAPPENED WHEN MERGING ON TO INTERSTATE. HAD TO RIDE ON SIDE TO NEXT EXIT. I HAVE LEARNED IF I GO INTO SPORT SHIFT MODE I DO NOT EXPERIENCE THIS ISSUE. I HAVE TAKEN TO DEALERSHIP, BUT UNABLE TO REPEAT ISSUE ON TEST DRIVE. THEY DID A DIAGNOSIS AND CLEARED SOME HISTORY CODES BUT IT DID NOT HELP. AGAIN THIS HAPPENS UNEXPECTEDLY.