Last Modified: 05-08-2025 6.11:8.1.0 Doc ID: RM100000001KL0B
Model Year Start: 2020 Model: RAV4 Prod Date Range: [10/2019 -           ]
Title: UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: U110387; Lost Communication with Stop and Start Control Module Missing Message; 2020 - 2025 MY RAV4 [10/2019 -        ]

DTC

U110387

Lost Communication with Stop and Start Control Module Missing Message

DESCRIPTION

The ECM and engine stop and start ECU send and receive signals via CAN communication.

If a communication error occurs between the ECM and engine stop and start ECU, the ECM stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

U110387

Lost Communication with Stop and Start Control Module Missing Message

While the ignition switch is ON, there is no communication between the ECM and stop and start ECU for 1.16 seconds or more (1-trip detection logic).
  • ECM
  • Engine stop and start ECU
  • CAN communication system

Does not come on

DTC stored

SAE Code:

U1103

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. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 30 seconds or more.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Wait for 3 seconds or more with the ignition switch ON.
  7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  8. Input the DTC: U110387.
  9. Check the DTC judgment result.

    Techstream 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 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: PRECAUTION 2021 - 2025 MY RAV4 [08/2020 -        ]; UB80E (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: PRECAUTION

PROCEDURE

1.

CLEAR DTC AND PERFORM ROAD TEST

(a) Clear the DTCs.

Powertrain > Transmission > Clear DTCs

HINT:

Write down the currently output DTCs before clearing them.

(b) Start the engine and drive the vehicle at a low speed.

NEXT

2.

CHECK DTC OUTPUT (DTC U110387)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

Powertrain > Transmission > Trouble Codes

(e) Read the DTCs using the Techstream.

Result

Proceed to

DTC U110387 is not output

A

DTC U110387 is output

B
A

CHECK FOR INTERMITTENT PROBLEMS

B

GO TO CAN COMMUNICATION SYSTEM 2020 MY RAV4 [10/2019 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2021 MY RAV4 [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2022 MY RAV4 [12/2021 - 10/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2023 MY RAV4 [10/2022 - 10/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2024 MY RAV4 [10/2023 - 11/2024]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2025 MY RAV4 [11/2024 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM