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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (1 Of 5)) >> Diagnostic Information and Procedures >> DTC P0171 or P0172 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify DTC P262B is not set.
    • Go to next step: If the DTC is not set 
  3. Verify there are no DTCs set related to the following component/system:
    • B9 Ambient Air Temperature Sensor
    • B17 Barometric Pressure Sensor
    • B34 Engine Coolant Temperature Sensor
    • B66 Intake Air Temperature Sensor
    • B115 Vehicle Speed Sensor
    • Go to next step: If a related DTC is not set 
  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.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

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