DTC B2791 Communication Condition Failure between ECM: Description

• If the ID code box receives a verification request signal from the ECM, it sends back verification information obtained from the certification ECU or steering lock ECU via the LIN communication line to the ECM.
• The ID code box sends immobilizer SET / UNSET signals to the ECM based on the information received from the certification ECU via the LIN communication line.

HINT:

• If the engine switch is turned off immediately after engine start, this DTC is also stored.
• If this DTC is detected, check if any other DTCs such as B2799 are output.