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HOMESERVICE MANUALSGMC2011SAVANA SPECIAL 4.8 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 (ENGINE CONTROLS AND FUEL - 6.6L (LGH) - DTC P0016 THROUGH DTC P11DC)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0299TESTINGCIRCUIT/SYSTEM TESTING
2011 GMC Savana Special 4.8 A

Circuit/System Testing

2011 GMC Savana Special 4.8 ASECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
    NOTE:

    Perform the Circuit /System Verification before proceeding with Circuit/System Testing.

  1. Verify the integrity of the air induction system and the turbocharger system by inspecting for the following conditions:
    • Any damaged components
    • Any loose or improperly installed components
    • A wet or restricted air filter
    • Any exhaust leaks before the turbocharger
    • Any exhaust restrictions after the turbocharger
    • Any snow or ice build-up in cold climates at the air cleaner and MAF sensor
    • Any water, snow, ice build-up, restrictions or coking at the MAP sensor
      • If a condition is found, repair or replace the affected component as necessary.
  2. Test the charge air cooler for leaks. Refer to Charge Air Cooler Diagnosis (Full System Air Leak Test) , Charge Air Cooler Diagnosis (Induction System Smoke Test) .
  3. Inspect the turbocharger oil supply tube for restrictions.
    • If a restriction is found, clean or replace the oil supply tube as necessary.
  4. Inspect the turbocharger and turbocharger ducts for debris, sticking vanes, worn impeller and turbine blades or damage. Refer to Turbocharger Cleaning and Inspection .
    • If worn or damaged turbocharger blades or vanes are found, replace the turbocharger assembly.
  5. If the induction system, charge air cooler system, the turbocharger and the turbocharger oil supply test normal, replace the B74 MAP sensor.
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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.