April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC B2271: Ignition Hold Monitor Malfunction: Description

This DTC is stored when a malfunction in the IG1 drive circuit, IG2 drive circuit or IG hold circuit in the power management control ECU is detected.

HINT:

When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).
When the auxiliary battery cable is disconnected and reconnected, the power source returns to the mode it was in before the auxiliary battery cable was disconnected.

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B2271	Either condition is met (1-trip detection logic*): The IG1 or IG2 drive circuit in the power management control ECU is malfunctioning. The IG hold circuit in the power management control ECU is malfunctioning.	AM2 fuse IG1 relays (Instrument panel junction block assembly) IG2 relay (No. 2 integration relay) Power management control ECU Wire harness or connector	Turn the power switch on (IG). HINT: To turn the power switch on (IG), carry the key and press the power switch twice with park (P) selected and the brake pedal released.

*: Only output while a malfunction is present and the power switch is on (IG)

HINT:

The IG1 and IG2 drive circuits activate the IG1 and IG2 relays.
After the IG1 and IG2 drive circuits turn on, even if the power management control ECU operates incorrectly, the IG hold circuit maintains the power switch on (IG) state.

VEHICLE CONDITION AND FAIL-SAFE FUNCTION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
The power source mode is not allowed to change to on (IG) (the hybrid control system cannot be started).	The power source mode cannot be changed to on (IG).