HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): P0A1F94; Hybrid/EV Battery Energy Control Module Unexpected Operation; 2018 - 2024 MY Camry HV [07/2017

Last Modified: 02-14-2025	6.11:8.1.0	Doc ID: RM1000000014UH6
Model Year Start: 2018	Model: Camry HV	Prod Date Range: [07/2017 - ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): P0A1F94; Hybrid/EV Battery Energy Control Module Unexpected Operation; 2018 - 2024 MY Camry HV [07/2017 - ]

DTC

P0A1F94

Hybrid/EV Battery Energy Control Module Unexpected Operation

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU assembly (main CPU) monitors the battery ECU assembly.

The cause of this malfunction may be the following:

Battery ECU assembly internal malfunction

Battery ECU assembly malfunction

DESCRIPTION

The hybrid vehicle control ECU assembly (main CPU) monitors the battery ECU assembly and stores this DTC when it detects a malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P0A1F94

Hybrid/EV Battery Energy Control Module Unexpected Operation

The battery ECU assembly value received by the hybrid vehicle control ECU assembly (main CPU) exceeds the threshold for a certain period of time.

(1 trip detection logic)

Battery ECU assembly

Comes on

Master Warning Light:

Comes on

MONITOR DESCRIPTION

The battery ECU assembly monitors the hybrid vehicle control ECU assembly via CAN communication. If the battery ECU assembly detects a malfunction in the hybrid vehicle control ECU assembly, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0A1F (INF P0A1F94): Battery Energy Control Module
Required sensors/components	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

Hybrid vehicle control ECU assembly

P0A1F (INF P0A1F94) 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.
Click here

Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream on.
Turn the power switch on (READY) and wait for 10 seconds or more. [*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 / Hybrid Control / 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 or N/A, perform the normal judgment procedure again.

PROCEDURE

1.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(d) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
P0A1F94 only is output.	A
DTCs except P0A1F94 are output.	B

(e) Turn the power switch off.

REPLACE BATTERY ECU ASSEMBLY

GO TO DTC CHART (HYBRID CONTROL SYSTEM)