Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication with DC/DC Converter Control Module "C" Missing Message (U01BD87)

Toyota Corolla Cross (2022-2025) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / Lost Communication with DC/DC Converter Control Module "C" Missing Message (U01BD87)

DESCRIPTION

The hybrid vehicle control ECU transmits and receives signals via CAN communication to and from the DC/DC converter assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

U01BD87

Lost Communication with DC/DC Converter Control Module "C" Missing Message

A CAN communication error between the DC/DC converter and hybrid vehicle control ECU (CAN communication system malfunction) occurs

(1 trip detection logic)

CAN communication system

Does not come on

Master Warning:

Comes on

SAE Code:

U01BD

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.

Click here

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS 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 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. Turn the ignition switch to ON (READY) and wait for 2 minutes or more.
  7. Enter the following menus: Powertrain / Hybrid Control / 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

(a) Check for DTCs.

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