Home >> Toyota >> 2023 >> Prius LE >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System (HEV) - Diagnostic Codes (2 Of 2), Symptom Tests & Circuit Tests >> HYBRID BATTERY SYSTEM (for M20A-FXS) >> DTC P1A81-00: Hybrid/EV Battery Stack 1 Delta SOC High (Extreme); DTC P1A86-00: Hybrid/EV Battery Stack 2 Delta SOC High (Extreme) [12/2022 - ] >> Typical Enabling Conditions