Ford Expedition backup sensor malfunction, fails to alert when reversing on Ford Expedition

Some Ford Expedition owners report experiencing issues with their backup sensors, such as failure to alert when reversing and displaying error messages or tones due to malfunctioning functionality. In certain cases, these sensors may erroneously detect non-existent objects or beep continuously, particularly in hot weather, which could suggest a problem with the IPMA module. Additionally, some owners note that a solid beep and obstruction indication may point to specific issues on the rear passenger side, potentially linked to wet wiring underneath the vehicle. Damage to the decoupling ring or water infiltration can also lead to sensor malfunctions, preventing proper alerts when reversing. Interestingly, some users have observed that their backup sensors operate correctly in rainy conditions but fail when it's dry, indicating environmental factors may influence performance. It is advisable for owners experiencing these issues to check for error messages, inspect the IPMA module, examine wiring for moisture, and ensure the sensors are undamaged and free from water infiltration.