NHTSA Complaint #11031986 — 2015 FORD C-MAX

VEHICLE IS NOT HOLDING EV NOW/LATER MODES CAUSING UNEXPECTED BATTERY USAGE AND FUEL CONSUMPTION. AN EXAMPLE IS TRAVELING HIGHWAY SPEEDS (70-75 MPH); VEHICLE WILL UNEXPECTEDLY SWITCH INTO AUTO MODE AND REVERT FROM GAS/HYBRID PERFORMANCE TO ELECTRIC/BATTERY ONLY PERFORMANCE WHICH IS REDUCED POWER AND RESPONSE AGAIN AT HIGHWAY SPEEDS. THIS IS NOT ALWAYS THE CASE AS I HAVE FOUND THIS TO HAPPEN BEFORE I ENTER THE HIGHWAY AND CAN ADJUST MY DRIVE ACCORDINGLY. ADDITIONALLY, THIS HAPPENS IN EV NOW MODE WHICH HOLDS THE ELECTRIC ENGINE TO PREVENT GAS USE AT ALL BUT THE SYSTEM WILL INADVERTENTLY SWITCH TO THE AUTO MODE. CONDITION IS EXTREMELY SPORADIC AND DIFFICULT TO REPLICATE MOST TIMES WILL HAPPEN WITHOUT THROWING A CHECK ENGINE LIGHT CODE. FORTUNATELY I DO HAVE A FEW INSTANCES WHERE A CODE WAS THROWN AND I WAS ABLE TO HAVE THE DEALER TAKE A LOOK AND MAKE SOME WARRANTY REPAIRS NONE OF WHICH HAVE RESOLVED THE ISSUE AS IT STILL COMES BACK IN THE SAME RANDOM FORM. ATTACHED ARE THE SEVERAL DEALER VISITS TO ADDRESS THE CONCERN AND AFTER SEVERAL VISITS, THE TRANSMISSION PUMP MODULE SEEMS TO BE A REPEAT ISSUE. UNFORTUNATELY NOT SURE IF THIS IS THE CAUSE OF THE MODES NOT HOLDING AS IT SHOULD.