2020 Toyota Avalon U0123 Fault Code: Lost Communication with Yaw Rate Sensor Module

The U0123 diagnostic trouble code in a 2020 Toyota Avalon indicates a lost communication link between the vehicle's electronic stability control system and the yaw rate sensor (YRS) module. This fault code typically appears when the vehicle's onboard computer cannot establish or maintain a stable signal from the Yaw Rate Sensor, which is critical for detecting vehicle rotation during cornering. While this issue may not always result in immediate safety concerns, it can lead to reduced stability control functionality and potential warning messages on the dashboard. The most common causes include wiring harness damage, sensor module failure, or electrical interference. It is recommended to have a qualified technician perform a diagnostic scan using an OBD2 scanner to confirm the code and assess the integrity of the sensor connection.