DTC P2561

DTC P2561: HVAC Malfunction

General Description

Courtesy of HONDA, U.S.A., INC.

When the engine is started as a fail safe action for the electrical coolant heater, the MIL comes on. The MIL comes on not as a monitor for malfunction of the component but to indicate engine start as a fail safe action for the heater.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Once per driving cycle
Sequence	None
Duration	-
DTC Type	Two drive cycles, MIL on

Enable Conditions

Condition
Other	It depends on a climate control system malfunction judgment

Malfunction Threshold

The MIL comes on not as a monitor for malfunction of the component but to indicate engine start as a fail safe action for the heater.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Electric water valve motor lock
Electric water valve position sensor failure
Electric water valve failure
Electric heater coolant pump failure
Electrical coolant heater failure
Heater core temperature sensor HIN-TW line failure
IMA CANH 1 line failure
IMA CANL1 line failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.