CUSTOMER CONCERN The tire-pressure warning system stores DTC C2126 because a transmitter ID is not received in main mode after sensor replacement. CAUSE The confirmed repair identified a failed replacement TPMS sensor and an incomplete transmitter-ID registration. CORRECTION Remove and replace the failed TPMS sensor, register all tire-pressure sensor IDs with the scan tool, perform system initialization, clear DTC C2126, and verify all tire pressures display correctly.