Toyota P0adf ((free)) Site

During the vehicle's power-on sequence, the hybrid ECU applies voltage to the control coils of these relays to close them. If the control line for SMRG experiences a short circuit to the chassis ground, the signal drops to a low voltage state. This prompts the ECU to set P0ADF and stop the startup sequence to prevent an electrical hazard. Common Root Causes of Code P0ADF

In rare cases, the Hybrid Vehicle Control ECU itself has a firmware bug. Toyota has released software updates for some models (e.g., 2016-2019 Prius) to address false P0ADF triggering. toyota p0adf