NHTSA Complaint #11205743 — 2018 MAZDA CX-5

VEHICLE WENT INTO LIMP MODE WHILE PASSING ON TWO LANE ROAD. CAUSE WAS DETERMINED TO BE WRONG LOGIC IN PCM FOR CYLINDER DEACTIVATION. THIS WORNG LOGIC CAUSED LOW OIL PRESSURE IN THE LIFTER DURING DEACTIVATION WHICH IN TURN CAUSED THE ROCKER ARM TO BECOME DISLODGED RENDERING THE ASSOCIATED VALVE INOPERABLE. THERE IS NO INDICATION TO THE DRIVER OF IF OR WHEN THIS HAPPENS. THE DRIVER IS THEN DRIVING THE CAR IN A VERY DANGEROUS STATE. THE PROBLEM ARISES WHEN THE THE RPMS BECOME ELEVATED TO AROUND 5000 RPMS AND ABOVE. AT THIS POINT THE COMPUTER SENSES TROUBLE WITH THAT CYLINDER DUE TO THE AIR FUEL RATIO NOT BEING CORRECT AND THROWS THE ENGINE INTO LIMP MODE. CREATING A VERY DANGEROUS SITUATION IF YOU ARE TRYING TO PASS OR AVOID SOMETHING WHERE YOU NEED THE ACCLERATION. EXTREMELY DANGEROUS!! WHEN I TOOK MY VEHICLE INTO MY DEALERSHIP THEY DISCOVERED THE MISFIRE ON CYLINDER #4 AND MAZDA HAD THEM REMOVE THE VALVE COVER AND INSPECT. UPON INSPECTION THEY FOUND A ROCKER ARM HAD FALLEN OFF . ACCORDING TO MAZDA MY CAR WAS THE 19TH THAT THEY HAD SEEN WITH THIS PROBLEM. MY CAR WAS IN THE SHOP IN OCT. OF 2018. BY THE TIME MY CAR WAS OUT OF THE SHOP THAT NUMBER HAD INCREASED TO 26. MAZDA SAID THE SOURCE OF THE PROBLEM WAS THE WRONG PCM PROGRAMING. THEY STATED THEY HAVE 2 SUPPLIERS OF PCMS AND ONE OF THEIR SUPPLIERS WAS USING THE WRONG PROGRAM. TO FIX MY CAR THEY REPLACED THE ENGINE AND REFLASHED THE PCM TO THE CORRECT PROGRAM. I ASKED THE DEALERSHIP IF THEY WERE GOING TO REFLASH ALL OF THE VEHICLES ON THEIR LOT THAT HAVE THIS ENGINE AND THEY SAID THEY DID NOT HAVE PERMISSION FROM MAZDA TO DO THIS. I FEEL THEY SHOULD HAVE DONE THAT BECAUSE MAZDA ADMITTEDLY DOES NOT KNOW WHICH CARS HAVE THE WRONG PROGRAM AND A SIMPLE REFLASH OF ALL NEW VEHICLS WOULD FIX THIS SITUATION. THE NUMBER OF THESE BAD VEHICLES IS INCREASNG AND MANY PEPLE COULD BE IN DANGER. MAZDA SHOULD RECALL ASAP