Last Modified: 12-11-2024 6.11:8.1.0 Doc ID: RM100000002OT5D
Model Year Start: 2025 Model: GR Corolla Prod Date Range: [09/2024 -           ]
Title: UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P16B09F; Actuator Cut Circuit Stuck Off; 2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 -        ]

DTC

P16B09F

Actuator Cut Circuit Stuck Off

DESCRIPTION

The ECM monitors its internal operation. If it detects a malfunction, the electronic throttle motor circuit inside the ECM is shut off to ensure the safety of the vehicle.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P16B09F

Actuator Cut Circuit Stuck Off

ECM main CPU malfunction (1-trip detection logic).

ECM

Does not Come on

SAE Code:

P16B0

MONITOR DESCRIPTION

When the EFI main relay is operated by the ECM after the ignition switch is turned off, if the electronic throttle motor circuit is detected as not being shut off correctly, the ECM will illuminate the MIL and store this DTC.

CONFIRMATION DRIVING PATTERN

HINT:

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Turn the ignition switch to ON and turn the GTS on.
  4. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  5. Input the DTC: P16B09F.
  6. Check the DTC judgment result.

    GTS Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    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 Confirmation Driving Pattern and check the DTC judgment result again.

CAUTION / NOTICE / HINT

NOTICE:

  • Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

    Click here 2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 -        ]; UC80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: PRECAUTION

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING BATTERY

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Transmission > Clear DTCs

HINT:

Write down the currently output DTCs before clearing them.

NEXT

2.

READ OUTPUT DTC (DTC P16B09F)

(a) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

(b) Connect the cable to the negative (-) battery terminal.

(c) Turn the ignition switch to ON and wait for 1 minute or more.

(d) Turn the ignition switch off and wait for 2 minutes or more.

HINT:

This DTC is detected after the ignition switch is turned off.

(e) Read the DTCs using the GTS.

Powertrain > Transmission > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P16B09F is output

B
A

CHECK FOR INTERMITTENT PROBLEMS

B

3.

REPLACE ECM

Click here 2025 MY GR Corolla [09/2024 -        ]; G16E-GTS (ENGINE CONTROL): ECM: REMOVAL

NEXT

PERFORM REGISTRATION