DTC P1A81-00: Hybrid/EV Battery Stack 1 Delta SOC High (Extreme); DTC P1A86-00: Hybrid/EV Battery Stack 2 Delta SOC High (Extreme) [11/2021 - ]: Procedure

1. Check for DTCs.

   Powertrain > HV Battery > Trouble Codes 

   Powertrain > Hybrid Control > Trouble Codes 

   Result

   Result	Proceed to
   "P1A81-00 or P1A86-00" only is output, or DTCs except the ones in the table below are also output.	A
   DTCs of hybrid battery system in the table below are output.	B
   DTCs of hybrid control system in the table below are output.	C

   System	Relevant DTC
   Hybrid battery system	P060A-47	Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
   	P060B-49	Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
   	P0606-87	Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
   	P0ABF-28	Hybrid/EV Battery Current Sensor "A" Signal Bias Level Out of Range / Zero Adjustment Failure
   	P0ABF-2A	Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range
   	P1CBB-12	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Auxiliary Battery
   	P1CBB-14	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Ground or Open
   	P1CC8-1E	Hybrid/EV Battery Stack 1 Voltage Difference Out of Range
   	P1CC9-1E	Hybrid/EV Battery Stack 2 Voltage Difference Out of Range
   Hybrid control system	P0A1F-94	Hybrid/EV Battery Energy Control Module Unexpected Operation
   	P0B23-1C	Hybrid/EV Battery "A" Voltage Sensor Voltage Out of Range
   	P1C2D-62	Hybrid/EV Battery "A" Voltage Sensor/ Boosting Converter Voltage Sensor "A" Signal Compare Failure

2. Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - ] 

Result: 

C 

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 03/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2024 - ] 

Result: 

A 

See step  2

1. Check the DTCs that were output when the vehicle was brought to the workshop.

   Result

   Result	Proceed to
   "P1A81-00" is also output.	A
   "P1A86-00" is also output.	B

Result: 

B 

See step  7

Result: 

A 

See step  3

1. Read the value of freeze frame data items "Hybrid/EV Battery Cell 1 Voltage" through "Hybrid/EV Battery Cell 35 Voltage" for DTC P1A81-00 and make a note if the value of any is the lowest voltage value.

   Powertrain > HV Battery > Trouble Codes 

2. Turn the ignition switch off.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

See step  4

Result

Result: 

B 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  5

1. Read the odometer to check the total distance the vehicle has been driven.

   Result

   Result		Proceed to
   Total distance driven is less than 200000 km (124280 mile)		A
   Total distance driven is 200000 km (124280 mile) or more	Current total distance driven - total distance driven when hybrid battery terminal block replaced = less than 200000 km (124280 mile) *1
   	Other than above	B

   HINT: 

   *1: If the hybrid battery terminal block has been replaced, use the total distance driven since it was replaced.

Result: 

A 

REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

B 

See step  6

Refer to REMOVAL [11/2021 - ]

Result

Result: 

NEXT 

REPLACE HYBRID BATTERY TERMINAL BLOCK. Refer to  REMOVAL [11/2021 - ] 

1. Read the value of freeze frame data items "Hybrid/EV Battery Cell 36 Voltage" through "Hybrid/EV Battery Cell 70 Voltage" for DTC P1A86-00 and make a note if the value of any is the lowest voltage value.

   Powertrain > HV Battery > Trouble Codes 

2. Turn the ignition switch off.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  8

See step  8

Result

Result: 

B 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  9

1. Read the odometer to check the total distance the vehicle has been driven.

   Result

   Result		Proceed to
   Total distance driven is less than 200000 km (124280 mile)		A
   Total distance driven is 200000 km (124280 mile) or more	Current total distance driven - total distance driven when hybrid battery terminal block replaced = less than 200000 km (124280 mile) *1
   	Other than above	B

   HINT: 

   *1: If the hybrid battery terminal block has been replaced, use the total distance driven since it was replaced.

Result: 

A 

REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

B 

See step  10

Refer to REMOVAL [11/2021 - ]

Result

Result: 

NEXT 

REPLACE HYBRID BATTERY TERMINAL BLOCK. Refer to  REMOVAL [11/2021 - ]