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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0068 or P1101 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Verify the integrity of the entire air induction system by verifying that none of the conditions listed below exist:
    • Any damaged, improperly installed, collapsed, or restricted components
    • Loose clamps, cracks, or other damage
    • An air flow restriction
    • Restricted air filter
    • Splits, kinks, leaks, or improper connections at the vacuum hoses
    • Vacuum leaks at the intake manifold, MAP sensor, and throttle body
    • Water intrusion
    • Any snow or ice buildup, in cold climates
    • Contamination of the MAF sensor element
    • Improper operation of the crankcase ventilation system - Refer to Crankcase Ventilation System Inspection/Diagnosis for further diagnosis.
    • Missing, restricted, or leaking exhaust components - Refer to Symptoms - Engine Exhaust for further diagnosis.
    • If a condition is found 

      Repair or replace component as appropriate.

    • Go to next step: If no condition is found 
  2. Test the engine for a mechanical condition. Refer to Symptoms - Engine Mechanical for diagnosis.
    • If a condition is found 

      Repair or replace component as appropriate.

    • Go to next step: If no condition is found 
  3. All OK
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