NHTSA Complaint #11253163 — 2018 FORD F-150

I HAVE HAD ISSUES WITH ERRORS/FAILED SENSORS FOR THE TIRE PRESSURE MONITORING SYSTEM ON THIS VEHICLE. AFTER 2 TRIPS TO THE DEALERSHIP AND CHANGING 2 SENSORS THE ISSUE WAS STILL PRESENT. I ACCIDENTALLY IDENTIFIED THE SOURCE OF THE ISSUE - INTERFERENCE FROM A DASHCAM - A REXING V1P PRO 3RD GENERATION. MEASURED ON A SPECTRUM ANALYZER THIS INTERFERENCE IS AT 312 MHZ AT AROUND (-78 DBM 1 M FROM THE DASHCAM) WHILE THE TPMS SENSORS OPERATE AROUND 315 MHZ AND MEASURE AROUND -82 DBM AT THE SAME LOCATION. THIS LEVEL OF INTERFERENCE (EVEN IF IT IS IN EXCESS OF FCC PART 15 EMISSIONS - AND I WILL BE CHECKING WITH THE FCC ALSO) AT THIS KIND OF FREQUENCY SEPARATION SHOULD NOT CAUSE ERRORS OR A FAILURE IN THE TPMS MONITORING SYSTEM. ALSO OF CONCERN IS THAT THE ERRORS DO NO SHOW UP FOR 45 MIN-1 HR OF DRIVING DESPITE TPMS DATA FROM ONE OR MORE WHEEL NOT BEING RECEIVED FOR THIS DURATION (CONFIRMED THROUGH ODBII DATA). THIS ALL POINTS TO A POORLY/CHEAPLY DESIGNED TPMS RECEIVER MODULE THAT IS PRONE TO FAILURE IF EXPOSED TO RF FROM ANY NUMBER OF DEVICES. I AM ALSO AN AMATEUR RADIO OPERATOR AND DO 2-WAY RADIO WORK FOR THE FEDERAL GOVERNMENT SO IT CONCERNS ME THAT EVEN NORMAL LMR OPERATION IN ONE OF THESE VEHICLES COULD CAUSE A SAFETY ISSUE. THE TPMS RECEIVER SHOULD BE TESTED FOR REASONABLE RELIABILITY IN THE PRESENCE OF RF IN ADJACENT SPECTRUM AND RECALLED IF NOT COMPLIANT WITH FCC PART 15 OR NHTSA OPERATIONAL REQUIREMENTS. THE DEALER/MANUFACTURER HAVE REFUSED TO EVEN LOOK INTO THIS ISSUE BEYOND WHAT THEY HAVE ALREADY DONE AT THE DEALERSHIP.