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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 P2AB8, P2AB9, P2ABB, P2ABC, P2B81, P2B82, P2B93, P2B94, U0644, or U0674 >> 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 P0245, P0246, P0249, P0250, P0641, P0651, P0697, P06A3, P103A, P10BE is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify DTC P2AB8, P2AB9, P2ABB, P2ABC, P2B81, P2B82, P2B93, P2B94, U0644, U0674 is not set.
    • If only DTC P2AB8, P2AB9, P2ABB, P2ABC, P2B81, P2B82 is set 

      Replace the appropriate component: M128 Turbocharger Wastegate Actuator

    • If DTC U0644, U0674 and one or more of the DTCs P2AB8, P2AB9, P2ABB, P2ABC, P2B81, P2B82 is set 

      Refer to: Circuit/System Testing

    • Go to next step: If only DTC P2B93, P2B94 is set 
  4. Engine - Idling - At normal operating temperature
  5. Perform the scan tool control function: Turbocharger Wastegate Position - Increase & Decrease

    Verify the control rod of the actuator moves smoothly over the full range.

    • If the control rod does not move smoothly over the full range 
    1. Ignition/Vehicle - Off
    2. Verify a condition does not exist with the component: Turbocharger
      • Mechanically stuck control rod. - Visible Damage / Incorrect connection
      • Wastegate Flap - Mechanically stuck / Binding or Sticking @ Closed / Open
      • Mechanically damaged - Debris/Visible Damage
    • Go to next step: If the control rod moves smoothly over the full range 
  6. Verify the scan tool parameter: Turbocharger Wastegate Position = The value should not spike or drop out.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: M128 Turbocharger Wastegate Actuator
    • Wiggle the harness and connector: K20 Engine Control Module
    • If the value spikes or drops out 

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

    • Go to next step: If the value does not spike or drop out 
  7. 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 does not set 
  8. All OK.
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