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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 12 (HYBRID ENGINE CONTROLS - DTC P181C TO DTC P2797)DTC P1AE2-P1AE4, P1B05, OR P1B06CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C

Circuit/System Testing

2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.

P1B05 and P1B06 without P1AE2, P1AE3 or P1AE4

    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.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.