DTC P0A7F-123: Hybrid Battery Pack Deterioration [12/2014 - ]: Description

The battery smart unit and the hybrid vehicle control ECU calculate the SOC (state of charge) of the HV battery through the accumulated amperage in the HV battery. The battery smart unit sends the condition of the HV battery to the hybrid vehicle control ECU. Then the hybrid vehicle control ECU calculates the SOC based on the information and controls HV battery charge and discharge according to the driving conditions.

Fig 1: State Of Chart Level Chart/Operation Chart

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DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0A7F	123	When either condition below is met: Resistance of an HV battery block exceeds the specified value. (1 trip detection logic) Difference in capacity between each battery block is larger than the standard. (2 trip detection logic)	HV battery Battery smart unit

RELATED DATA LIST

DTC No.	Data List
P0A7F-123	Internal Resistance R01 to R10 Battery Block Vol -V01 to V10 State of Charge (All Bat)

The following items can be helpful when performing repairs:

Data List

Ready Signal
Vehicle Spd
Accelerator Degree
Shift Sensor Shift Pos
Engine Revolution
Power Resource VB
Batt Pack Current Val
Auxiliary Battery Vol
Battery Low Time
DC Inhibit Time
SOC after IG-ON
Status of Charge Max
Status of Charge Min
Total Distance Traveled
DTC Clear Run Distance
Engine Run Time

Operation History Data

Main Battery Low Voltage

HINT:

For confirmation of this DTC output, it needs clearing DTCs and driving the vehicle for approximately 10 minutes. (As 2 trip detection logic is also used, check for DTCs including pending DTCs.)
When the internal resistance of the HV battery increases, battery block voltage may drop.