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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P131D, P131E, P1385, or P1386 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Verify there are no DTCs set related to the following component/system: B34 Engine Coolant Temperature Sensor
    • Go to next step: If a related DTC is not set 
  2. Verify the following conditions do not exist:
    • Exhaust Gas Recirculation Valve Cooler - Restricted
    • Exhaust Gas Recirculation Valve 2 - Binding or Sticking/Restricted/Visible Damage
    • Exhaust Pressure Control Valve - Binding or Sticking/Restricted
    • Exhaust Gas Recirculation System - Leaking/Restricted
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  3. Clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Replace the component: M122 Exhaust Pressure Regulator Valve

    • Go to next step: If no DTC is set 
  6. All OK.
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