Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001N35J
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): P1C8549; High Voltage Power Resource Internal Electronic Failure; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

DTC

P1C8549

High Voltage Power Resource Internal Electronic Failure

DESCRIPTION

The battery ECU assembly monitors an internal operation of the hybrid vehicle control ECU. If it detects a malfunction, it will be output this DTC and performs fail-safe control.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P1C8549

High Voltage Power Resource Internal Electronic Failure

An abnormal signal is detected by the battery ECU assembly (excessive discharging current).

(1 trip detection logic)

Hybrid vehicle control ECU

Does not come on

Master Warning:

Comes on

Related Data List

DTC No.

Data List

P1C8549
  • Hybrid/EV Battery Current
  • Hybrid/EV Battery Voltage
  • VL-Voltage before Boosting
  • VH-Voltage after Boosting

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 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): UTILITY

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the power switch off and wait for 2 minutes or more.
  5. Turn the power switch on (IG) and turn the Techstream on.
  6. Drive the vehicle for approximately 10 minutes according to the freeze frame data items "Vehicle Speed", "Accelerator Position", "Hybrid/EV Battery Temperature 1 to 6" and "Hybrid/EV Battery Current".
  7. Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
  8. 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 driving pattern again.

PROCEDURE

1.

CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.

(d) Check for DTCs.

Powertrain > HV Battery > Trouble Codes

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

"P1C8549" only is output.

A

DTCs except "P1C8549" of hybrid battery system are output.

B

DTCs except "P1C8549" of hybrid control system are output.

C

(e) Turn the power switch off.

A

REPLACE HYBRID VEHICLE CONTROL ECU

B

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

C

GO TO DTC CHART (HYBRID CONTROL SYSTEM)