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Home >> Cadillac >> 2021 >> CT5 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Controls And Fuel - 3.0L (LGY) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P1176 or P1177 >> 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 the scan tool parameter: Fuel Pump Power Control Module 5V Reference Circuit Status or Fuel Pump Power Control Module 5V Reference 2 Circuit Status @ K20 Engine Control Module = Okay
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  3. Verify the scan tool parameter: Fuel Pump Power Control Module 5V Reference Circuit Status or Fuel Pump Power Control Module 5V Reference 2 Circuit Status = The parameter state should not change.

    Perform the action while monitoring the parameter:

    • { P1176 } Wiggle the harness and connector: B150 Fuel Tank Pressure Sensor
    • { P1177 } Wiggle the harness and connector: B47 Fuel Pressure Sensor
    • Wiggle the harness and connector: K111 Fuel Pump Driver Control Module
    • If the parameter state changes 

      Repair as necessary - Wiring / Terminal (s) / Electrical Connector (s)

    • Go to next step: If the parameter state does not change 
  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 the DTC is not set 
  5. All OK.
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