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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 129 (Engine Controls And Fuel - 3.6L (LF4) - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0089, P00C6, P228C, P228D, or P2C1E-P2C20 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Verify the following conditions do not exist:
    • Q17 Fuel Injector - Leaking/Restricted
    • Camshaft Position Actuator - Binding or Sticking/Stuck
    • Direct Fuel Injection Fuel Rail - Leaking/Restricted
    • Fuel - Contaminated/Poor Quality
    • Fuel Feed Pipe - Leaking/Restricted
    • Fuel Pressure Regulator - Binding or Sticking/Stuck
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  3. Remove the component: G18 Fuel Pump - High Pressure
    4. NOTE:

    The visual inspection is through the access where the component is mounted.

  4. Verify a condition does not exist with the component: Camshaft Lobe (s) - Worn/Visible Damage
    • If a condition exists 

      Replace the component: Camshaft

    • Go to next step: If no conditions exist 
  5. Test or replace the component: G18 Fuel Pump - High Pressure
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