LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P0BFD >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    WARNING:

    Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

    The High Voltage Disabling procedure will perform the following tasks:

    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Failure to follow the procedures exactly as written may result in serious injury or death.

  1. Perform the High Voltage Disabling procedure.
  2. Remove the 3-phase cables from the K59 generator control module.
  3. Test for infinite resistance between each of the 3-phase circuit terminals listed below and ground:
    • X8 phase U terminal
    • X7 phase V terminal
    • X6 phase W terminal
    • If not the specified value, disconnect the 3-phase cables from the A15 starter generator, and test the AC circuits for a short to ground. If the circuit tests normal, replace the A15 starter generator.
    • Replace the K59 starter generator control module. If the DTC resets replace the A15 starter generator.