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HYBRID BATTERY SYSTEM, Diagnostic DTC:P31B549

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DTC Code DTC Name
P31B549 Hybrid/EV Battery Internal Electronic Failure
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DESCRIPTION

The battery ECU assembly monitors its internal operation and will store these DTCs when it detects an internal malfunction.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P31B549 Hybrid/EV Battery Internal Electronic Failure

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

(1 trip detection logic)

 Hybrid vehicle control ECU assembly Does not come on

Master Warning Light:

Comes on
Table 1. Related Data List
DTC No. Data List
P31B549 Hybrid Battery Current
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CONFIRMATION DRIVING PATTERN

Tip:

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

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  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 on urban roads for approximately 10 minutes.

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

  8. Check the DTC judgment result.

    Tip:

    • 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, perform driving pattern again.

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PROCEDURE


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    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.


      1. Powertrain > HV Battery > Trouble Codes



      1. Powertrain > Hybrid Control > Trouble Codes


      Result
      Result Proceed to
      "P31B549" only is output. A
      DTCs except "P31B549" of hybrid battery system are output. B
      DTCs except "P31B549" of hybrid control system are output. C

    5. Turn the power switch off.


    • A

      REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLYClick here

    • B

      GO TO DTC CHART (HYBRID BATTERY SYSTEM)Click here

    • C

      GO TO DTC CHART (HYBRID CONTROL SYSTEM)Click here