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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 404 (Engine Controls And Fuel - 6.2L (LT4) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information And Procedures >> DTC P1176 or P1177 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify the scan tool parameter:
    • {P1176} Fuel Pump Power Control Module 5V Reference = 4.8 to 5.2 V
    • {P1177} Fuel Pump Power Control Module 5V Reference 2 = 4.8 to 5.2 V
    • If not the specified value 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified value 
  3. 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 the DTC is not set 
  4. All OK.
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