HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with PA10): P0ABF2A; Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range; 2023 - 2026 MY Corolla HV [09/2022

Last Modified: 06-05-2026	6.11:8.1.0	Doc ID: RM1000000026PZ2
Model Year Start: 2023	Model: Corolla HV	Prod Date Range: [09/2022 - ]
Title: HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with PA10): P0ABF2A; Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range; 2023 - 2026 MY Corolla HV [09/2022 - ]

DTC

P0ABF2A

Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range

DESCRIPTION

Refer to the description for DTC P0ABF11.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0ABF2A

Hybrid/EV Battery Current Sensor "A" Signal Stuck In Range

The hybrid battery voltage is changing but the hybrid battery current and battery current sensor output do not change.

(1 trip detection logic)

HV battery junction block assembly
Battery ECU assembly

Comes on

Master Warning:

Comes on

SAE Code: P0AC0

MONITOR DESCRIPTION

If the battery ECU assembly detects a malfunction in a battery current sensor, the battery ECU assembly will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0AC0 (INF P0ABF2A): Current sensor malfunction
Required sensors/components	Battery current sensor / Battery ECU assembly
Frequency of operation	Continuous
Duration	TMC's intellectual property
MIL operation	1 driving cycle
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

Battery ECU assembly

DTC P0AC0 (INF P0ABF2A) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for 2 minutes or more.
Turn the ignition switch to ON and turn the GTS on.
Drive the vehicle on urban roads for approximately 5 minutes.[*1]
HINT:

[*1]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.

PROCEDURE

1.	CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)

(a) Check for DTCs.

Powertrain > HV Battery > Trouble Codes

Powertrain > Hybrid Control > Trouble Codes

Result

Result	Proceed to
"P0ABF2A" 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	P060A47	Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
	P060B49	Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
	P060687	Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
	P0ABF11	Hybrid/EV Battery Current Sensor "A" Circuit Short to Ground
	P0ABF15	Hybrid/EV Battery Current Sensor "A" Circuit Short to Auxiliary Battery or Open
	P1CBB12	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Auxiliary Battery
	P1CBB14	Hybrid/EV Battery Current Sensor Power Supply Circuit Short to Ground or Open
Hybrid control system	P0A1F94	Hybrid/EV Battery Energy Control Module Unexpected Operation

(b) Turn the ignition switch off.

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

2.	READ VALUE USING GTS (HYBRID/EV BATTERY CELL VOLTAGE)

(a) Turn the ignition switch to ON.

NOTICE:

Do not turn the ignition switch to ON (READY).

(b) Check the voltage of each "Battery Cell Vol" of "Hybrid/EV Battery Cell 1 to 56 Voltage" in the Data List with the ignition switch ON.

Powertrain > HV Battery > Data List

NOTICE:

Select "Hybrid/EV Battery Cell 1 to 56 Voltage" only. (Do not select any other Data List items.)

Specified Condition:

Any "Hybrid/EV Battery Cell Voltage" changes by 0.05 V or more, 60 seconds after the ignition switch is turned to ON. (The difference between the maximum and minimum voltage is 0.05 V or more.)

Result

Result	Proceed to
The change in voltage of any "Hybrid/EV Battery Cell Voltage" is 0.05 V or more.	A
Other than above	B

REPLACE BATTERY ECU ASSEMBLY

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY