WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
Note
B1003
ECU Malfunction
A malfunction in the non-volatile storage of the central gateway ECU (network gateway ECU) is detected.