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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Engine Controls And Fuel - 3.6L (LGX) - Diagnostic Information And Procedures (P0010-P0446)) >> Diagnostic Information and Procedures >> DTC P018B-P018D >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0231, P0232, P023F, P0641, P1255, P0129, P12A6 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Engine running.
  4. Verify the scan tool parameter: Fuel Pressure Sensor = 2.7 to 3.8 V
    • If not between 2.7 and 3.8 V 

      Refer to: Circuit/System Testing

    • Go to next step: If between 2.7 and 3.8 V 
  5. 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.
  6. Verify the DTC does not set.
    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC does not set 
  7. All OK.
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