SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1311 (HYBRID ENERGY STORAGE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0BC1CIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U

Circuit/System Testing

2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
    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. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  2. Remove the drive motor generator battery case upper cover, front cover, and right side cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
  3. Ignition OFF, connect the 12-volt battery.
  4. Ignition ON, disconnect the X2 connector at the BECM, connect a DMM between terminal 2 and ground at the X2 harness connector. You should measure less than 0.9 volt.
    • If less than 0.9 volt, replace the drive motor generator battery control module.
  5. Disconnect the harness connector at the vent fan relay.
  6. Ignition OFF, connect a test lamp at the vent fan relay harness connector between terminals 1 and 2. The test lamp should not illuminate.
    • If the test lamp illuminates, test the vent fan relay control circuit for a short to ground. If the circuit tests normal, replace the drive motor generator battery control module.
  7. Ignition ON, connect a test lamp at the vent fan relay harness connector terminal 4 and ground. The test lamp should not illuminate.
    • If the test lamp illuminates, repair the short to B+ on the supply voltage circuit between the battery fan relay and the battery vent motor.
  8. Ignition OFF, disconnect the inline harness connector at the drive motor generator battery vent fan.
  9. Ignition ON, connect a test lamp at the battery vent fan harness connector terminal 4. The test lamp should not illuminate.
    • If the test lamp illuminates, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the drive motor generator battery control module.
  10. Test for infinite resistance between terminal 3 and 4 on the drive motor generator battery vent fan relay.
    • If continuity is detected, replace the drive motor generator battery vent fan relay.
    • If infinite resistance is measured, replace the drive motor generator battery vent fan.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.