DTC P0AA6
DTC P0AA6: HV Battery Voltage System Isolation Fault
General Description
There are high voltage parts including the battery pack in the electric powertrain system. The high voltage parts are insulated from the body on both positive and negative circuits. The battery condition monitor module detects decreases in the insulation resistance (short circuit resistance), and if the resistance drops to a specified resistance, a malfunction is detected and a DTC is stored.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | - |
| DTC Type | One drive cycle, MIL off, POWER SYSTEM indicator on, 12 VOLT CHARGING SYSTEM indicator off |
Enable Conditions
| Condition | ||
|---|---|---|
| High voltage contactor | ON | |
| Vehicle | ON mode | |
Malfunction Threshold
The short circuit resistance value is 592 kΩ or less.
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 A/C compressor internal failure
- Power control unit (PCU) internal circuit failure
- DC-DC converter internal failure
- Battery pack internal failure
- Battery power cable failure
- Traction motor failure
- Generator motor failure
- Subjunction board internal failure
- Junction board internal failure
- Battery condition monitor module internal circuit failure
Confirmation Procedure
Operating Condition
Turn the vehicle to the READY TO DRIVE mode, and wait for at least 60 seconds.
Be sure to operate the following:
- Generator motor
- Traction motor
- Electric A/C compressor
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the battery condition monitor module memory. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command or the battery condition monitor module reset.