Advanced Diagnostics

DTC P1446 (74): Battery Module Individual Voltage Input Deviation




General Description
Each channel monitors the voltage of 12 cells. When one cell in a channel is abnormal, the voltage differs by 1.2 V from the other channels.

Therefore, if the difference between channels increases to 1.2 V or more, at least one cell is considered to be abnormal, or the voltage detection system is considered to be abnormal.

If the difference between the channels is a specified value for a set time, the battery condition monitor (BCM) module detects a malfunction, and a DTC is stored.




Monitor Execution, Sequence, Duration, DTC Type, OBD Status




Enable Conditions

Malfunction Threshold
The voltage difference between channels is 1.2 V or more for at least 25.4 seconds.

Driving Pattern
1. Reset the BCM module. (Disconnect the 12 V battery terminal once and reconnect it.)
2. Start the engine, and hold the engine speed to between 3,500 - 4,000 rpm in Park or neutral until the IMA battery level gauge (BAT) indicates full charge.
3. Turn the ignition switch off.
4. Repeat steps 1-3 five times.
5. Start the engine.
6. Let the engine idle for at least 3 minutes.

- If you have difficulty duplicating the DTC, retest after turning off electrical components such as the audio system and A/C, and try a different gear.

Diagnosis Details

Conditions for illuminating the MIL
When a malfunction is detected, the MIL comes on and the DTC and the freeze frame data are stored in the PCM and BCM memory.

Conditions for clearing the MIL
The MIL will be cleared if the malfunction does not recur during three consecutive trips in which the diagnostic runs.

The MIL, the DTC, and the freeze frame data can be cleared by using the scan tool Clear command or by disconnecting the battery.