DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0104: Lost Communication with Cruise Control Module; DTC U0122: Lost Communication With Vehicle Dynamics Control Module [01/2019 - 09/2022]: Description
WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, and 2020 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
The ECM communicates with each sensor and ECU via CAN communication.
If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| U0100 | Lost Communication With ECM/PCM "A" | When the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake actuator assembly) and ECM is detected for approximately 1 second or more. |
|
Cruise Control |
| U0104 | Lost Communication with Cruise Control Module | When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication malfunction between the millimeter wave radar sensor assembly and ECM is detected for approximately 1 second or more. |
|
Cruise Control |
| U0122 | Lost Communication With Vehicle Dynamics Control Module | When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake actuator assembly) and ECM is detected for approximately 2.6 seconds or more. |
|
Cruise Control |