TCU check the Battery voltage, in order to maintain optimum condition of each sensors and solenoid-valve.
TCU set this code, when input lower voltage than specified value.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Check the voltage range
? Battery
? Alternator
? TCU
? Wiring harness
Enable Conditions
? IG "ON"
? Input speed > 800rpm
Threshold Value
? Battery voltage > 9V
Diagnostic Time
? More than 20times × more than1sec
Fail Safe
? Self learning control is inhibited
? Adaptive control is inhibited