DTC P0AA7
DTC P0AA7: HV Battery Voltage Isolation Sensor Circuit
General Description
The battery condition monitor module monitors the ground resistance value of the high voltage circuit by the BATT+ line and the BATT- line. When an abnormality is detected on the ground resistance detection circuit, the BATT lines, or the contactors for a specified time, a malfunction is detected and a DTC is stored.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Once per driving cycle (After the vehicle condition is turned to the ON mode) or during the vehicle condition is turned to the ON mode |
| Sequence | None |
| Duration | 12 seconds or more |
| DTC Type | One drive cycle, MIL off, POWER SYSTEM indicator on, 12 VOLT CHARGING SYSTEM indicator off |
Enable Conditions
| Condition | ||
|---|---|---|
| Vehicle | ON mode | |
Malfunction Threshold
The ground resistance detection circuit, the BATT lines, or the contactors is abnormal for at least 12 seconds.
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.
- Battery pack BATT+ line open
- Battery pack BATT- line open
- High voltage contactor internal failure
- High voltage sub contactor internal failure
- Battery condition monitor module internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the POWER SYSTEM indicator comes on and 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 POWER SYSTEM indicator is cleared if the malfunction does not return in the next trip in which the diagnostic runs. The POWER SYSTEM indicator, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool clear command.