HYBRID CONTROL SYSTEM, Diagnostic DTC:P0B23-129

DTC Code DTC Name
P0B23-129 Hybrid Battery "A" Voltage

DESCRIPTION

The battery smart unit (battery energy control module) sends HV battery voltage information to the hybrid vehicle control ECU via serial communication.

DTC No. INF Code DTC Detection Condition Trouble Area
P0B23 129

Battery smart unit malfunction (HV battery voltage sensor malfunction)

When not boosting the difference between "Power Resource VB" and "VL-Voltage before Boosting" is large, and also "Power Resource VB" and "VH-Voltage after Boosting" is large.

(1 trip detection logic)

 Battery smart unit
Related Data List
DTC No. Data List
P0B23-129

  • Power Resource VB

  • VL-Voltage before Boosting

  • VH-Voltage after Boosting

  • Boost Ratio

The following items can be helpful when performing repairs:


CAUTION / NOTICE / HINT

Note

Performing the check procedures for a long time with the shift lever in N may cause DTC P3000-388 to be set.

Tech Tips


  • After performing troubleshooting, if it is necessary to replace the battery smart unit, voltages need to be confirmed after installing the new battery smart unit. Confirm that "Power Resource VB", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" in the Data List are 155 V or more with the ignition switch to ON (READY), shift lever in P, and the engine stopped. When the system is normal, the "Power Resource VB", "VL-Voltage before Boosting", and "VH-Voltage after Boosting" values should be almost equal (voltage boosting will not occur when the shift lever is in N). If the difference between each voltage exceeds the values specified below, there must be a malfunction in the battery smart unit or the inverter with converter assembly.

    Inspection voltage Maximum voltage difference
    Difference between "Power Resource VB" and "VL-Voltage before Boosting" 35 V
    Difference between "Power Resource VB" and "VH-Voltage after Boosting" 60 V
    Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" 80 V

  • After the repair, if "VL-Voltage before Boosting" and "Power Resource VB" are approximately the same when the ignition switch is turned to ON (READY) with the shift lever in P and the accelerator pedal not depressed, the condition is judged as normal.

PROCEDURE


  1. CHECK DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

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

    4. Check if DTCs are output.

      Result
      Result Proceed to
      Only P0B23-129 is output or P0B23-129 and DTCs other than the ones in the table below are also output. A
      DTCs shown in Table 1 are output simultaneously. B
      DTCs shown in Table 2 are output simultaneously. C
      Table 1
      DTC No. Relevant Diagnosis
      P06E6-164 Sensor Power Supply "C" Circuit/Open
      P0A1A-151, 658 Generator Control Module
      P0A1B-786 Drive Motor "A" Control Module
      P0A1D-148 Hybrid Powertrain Control Module
      P0D2F-266 Drive Motor "A" Inverter Voltage Sensor Circuit Low
      P0D30-267 Drive Motor "A" Inverter Performance
      P0E33-589 DC/DC Converter Voltage Sensor "A" Low
      P0E34-590 DC/DC Converter Voltage Sensor "A" High
      P1C2A-155 Generator A/D Converter Circuit
      P1C73-512 Sensor Standard Voltage "F" Circuit/Open
      P1CA6-156 Generator Control Module Malfunction
      P1CA7-193 Drive Motor Control Module Malfunction
      P2511-149 HV CPU Power Relay Sense Circuit Intermittent No Continuity
      P3004-132 High Voltage Power Resource
      P3133-659 Communication Error from Generator to Drive Motor "A"
      P3134-661 Communication Error from Drive Motor "A" to Generator
      P324E-788 MG-ECU Power Relay Intermittent Circuit
      U0110 (all INF codes)*1 Lost Communication with Drive Motor Control Module "A"
      Table 2
      DTC No. Relevant Diagnosis
      P0AFC-123 Hybrid Battery Pack Sensor Module
      P0B3D-123 Hybrid Battery Voltage Sensor "A" Circuit Low
      P0B42-123 Hybrid Battery Voltage Sensor "B" Circuit Low
      P0B47-123 Hybrid Battery Voltage Sensor "C" Circuit Low
      P0B4C-123 Hybrid Battery Voltage Sensor "D" Circuit Low
      P0B51-123 Hybrid Battery Voltage Sensor "E" Circuit Low
      P0B56-123 Hybrid Battery Voltage Sensor "F" Circuit Low
      P0B5B-123 Hybrid Battery Voltage Sensor "G" Circuit Low
      P0B60-123 Hybrid Battery Voltage Sensor "H" Circuit Low
      P0B65-123 Hybrid Battery Voltage Sensor "I" Circuit Low
      P0B6A-123 Hybrid Battery Voltage Sensor "J" Circuit Low
      P0B6F-123 Hybrid Battery Voltage Sensor "K" Circuit Low
      P308A-123 Hybrid Battery Voltage Sensor All Circuits Low

      Tech Tips


      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.

      • P0B23-129 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

    5. Turn the ignition switch off.


    A

    REPLACE BATTERY SMART UNIT Click here

    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    C

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) Click here