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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1360 (Hybrid Controls - DTC P181C To DTC P2797) >> DTC P1AE2-P1AE4, P1B05, or P1B06 >> Circuit/System Testing >> P1B05 and P1B06 without P1AE2, P1AE3 or P1AE4

P1B05 and P1B06 without P1AE2, P1AE3 or P1AE4

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: DTC P1B05 and P1B06 should always pass and fail together. If one DTC has passed while one has failed, replace the drive motor generator power inverter control module (PIM).
  1. Ignition OFF, wait 2 minutes.
    2. IMPORTANT: The drive motor generator control module sight shield must be installed during all testing in order to complete the HVIC current loop.
  2. Disconnect PIM connector X1.
  3. Ignition ON, observe the BECM HVIC Current Source parameter.
    • If the HVIC Current Source parameter indicates current less than 5 mA, replace the PIM.
    • If the HVIC Current Source parameter indicates current between 5-18 mA test for the HVIC Source and HVIC Return circuits shorted together between PIM connector X1 and X350.
      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.
      IMPORTANT: Removal of the HV manual disconnect lever also opens the HVIC source circuit between X350 and BECM connector X1.
    • If the circuit tests normal, perform the High Voltage Disabling procedure and test for the HVIC Source and HVIC Return circuits shorted together between X350 and BECM connector X1. If the circuit tests normal, replace the BECM.
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