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Home >> Jeep >> 2024 >> Grand Cherokee Summit >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 26 (Battery Pack Control Module (BPCM) - DTCS P0EDD-00 To P1AE3-00) >> DTC Troubleshooting >> P1A21-00-HV Battery Contactor Control Sequence Incorrect >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    WARNING:

    On vehicles equipped with the high voltage system, you must thoroughly read and follow all High Voltage Safety procedures. In addition, before performing any diagnostic or service procedure near a high voltage component, you must perform the High Voltage Power Down. Failure to follow these instructions may result in possible serious or fatal injury.

    Read the HIGH-VOLTAGE SAFETY PROCEDURES. Refer to  HIGH VOLTAGE SAFETY PROCEDURES  . 

    When the HIGH-VOLTAGE POWER-DOWN PROCEDURE is necessary. Refer to  HIGH VOLTAGE POWER DOWN  . 

    1. With the scan tool, read Battery Pack Control Module (BPCM) DTCs and record on the repair order.
    2. Record the Freeze Frame Data (If available), Event Data (If available), and Environmental Data.
    3. With the scan tool, erase DTCs.
      NOTE:

      Most BPCM DTCs will require the EVSE to be disconnected in order to clear.

    4. Using the recorded data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read BPCM DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs and scan report.

      Are there any HCP or IDCM DTCs present?

      Yes 

      • Perform the appropriate DTC diagnostic test.
      • Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to HV VERIFICATION TEST .

      No 

      • Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to HV VERIFICATION TEST .
      • Test complete.