DTC P1CFA-12: IGB Signal Circuit Short to Auxiliary Battery [11/2023 - ]: Description
WARNING: This page is about a different car, the 2025 Toyota Highlander and 2024 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
The hybrid vehicle control ECU monitors the IGB signal received from the certification ECU (smart key ECU assembly). When an error is detected in the IGB signal, this DTC is stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P1CFA-12 | IGB Signal Circuit Short to Auxiliary Battery | An IGB signal from the hybrid vehicle control ECU is on when the ignition switch is off. (1 trip detection logic) |
|
Does not come on | Master Warning: Comes on |