HYBRID BATTERY SYSTEM, Diagnostic DTC:P31B400

DTC Code DTC Name
P31B400 Extreme Hybrid/EV Battery Charging Current

DESCRIPTION

The battery ECU assembly monitors its internal operation, it will set DTCs and perform fail-safe control when it detects the following malfunction.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P31B400 Extreme Hybrid/EV Battery Charging Current

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

(1 trip detection logic)

 Hybrid vehicle control ECU Does not come on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P31B400 Hybrid Battery Current

CONFIRMATION DRIVING PATTERN

Tech Tips

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


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS 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 GTS on.

  6. Drive the vehicle for approximately 10 minutes according to the freeze frame data items "Vehicle Speed", "Accelerator Position", "Hybrid Battery Temperature 1 to 15" and "Hybrid Battery Current".

  7. Enter the following menus: Powertrain / HV battery / Utility / All Readiness.

  8. Check the DTC judgment result.

    Tech Tips


    • 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)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.

    4. Check for DTCs.


      Powertrain > HV Battery > Trouble Codes
      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      "P31B400" only is output. A
      DTCs except "P31B400" of hybrid battery system are output. B
      DTCs except "P31B400" of hybrid control system are output. C

    5. Turn the power switch off.


    A

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    B

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) Click here

    C

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here