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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 133 (Engine Heating And Cooling - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P26CE, P2B85, P2BA2, P2DE9, P2E82, P3071-P3076, U0672, or U131B >> Circuit/System Verification

Circuit/System Verification

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:
    • Incorrect fluid level or condition - Coolant@Surge Tank - Refer to:Loss of Coolant (LSY) 
    • Antifreeze Concentration - Incorrect
    • G59 Engine Coolant Pump - Abnormal noise /Leaking/Stuck On/Visible Damage
    • Hoses / Lines@Cooling System - Leaking/Loose Clamps/Visible Damage
    • Hoses / Lines@G59 Engine Coolant Pump - Leaking/Loose Clamps/Visible Damage
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify DTC U0672, U1348 is not set.
    • If DTC U0672, U1348 is set and other DTCs are set 

      Refer to:DTC U1345-U1349

    • If DTC U0672 is set and no other DTCs are set 

      Refer to: Circuit/System Testing

    • Go to next step: If none of the DTCs are set 
  5. Verify DTC U131B is not set and no other DTCs are set.
    • If DTC U131B is set and no other DTCs are set 

      Replace the component: G59 Engine Coolant Pump

    • Go to next step: If the DTC is not set 
  6. Verify DTC P26CE, P2B85, P2BA2, P2DE9, P2E82, P3071, P3072, P3073, P3074 is not set.
    • If any of the DTCs are set 

      Replace the component: G59 Engine Coolant Pump

    • Go to next step: If none of the DTCs are set 
    7. NOTE:

    If the system has recently been serviced, it is possible that air is trapped in the system causing the condition or a DTC to set.

  7. Verify DTC P3075, P3076 is not set.
    • If any of the DTCs are set 
    1. Engine - Idling - At normal operating temperature.
      2. NOTE:

      For this test, the action may need to be repeated several times.

    2. Perform the following procedure/test: Engine Coolant Fill - Refer to:Cooling System Draining and Filling (LSY GE 47716)Cooling System Draining and Filling (LSY Static Fill)Cooling System Draining and Filling (LSY with V03 Static Fill)Cooling System Draining and Filling (L3B Static Fill)Cooling System Draining and Filling (L3B GE 47716)Cooling System Draining and Filling (LSY with V03 GE 47716)Cooling System Draining and Filling (LF4 Static Fill)Cooling System Draining and Filling (LF4 GE 47716)

      Verify the condition does not exist:Fill Level = Low@Surge Tank

      • If a condition exists - Repair as necessary
      • Go to next step: If no condition exists
    3. Replace the component: G59 Engine Coolant Pump
    • Go to next step: If none of the DTCs are set 
  8. Engine - Idling - At normal operating temperature.
  9. Verify the scan tool parameter:
    • Engine Coolant Pump Internal Status = Okay
    • Engine Coolant Pump Stalled = No
    • If not the specified state 

      Replace the component: G59 Engine Coolant Pump

    • Go to next step: If the specified state 
  10. Verify the scan tool parameter: Desired Engine Coolant Pump Speed = Engine Coolant Pump Speed
    • If not equal 

      Refer to: Circuit/System Testing

    • Go to next step: If equal 
  11. Verify the scan tool parameter: Engine Coolant Pump Supply Voltage Status = Okay
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  12. Verify the scan tool parameter: Engine Coolant Pump Dry = No
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Perform the following procedure/test:Cooling System Leak Testing 

      Verify the procedure/test passes.

      • If the procedure/test does not pass - Repair or replace as necessary
      • Go to next step: If the procedure/test passes
    3. Replace the component: G59 Engine Coolant Pump
    • Go to next step: If the specified state 
  13. Perform the scan tool control function: Engine Coolant Pump - Command the component to the maximum position/speed

    Verify the scan tool parameter: Engine Coolant Pump Current = 0.6 to 79 A

    • If not between 0.6 and 79 A 

      Refer to: Circuit/System Testing

    • Go to next step: If between 0.6 and 79 A 
  14. Verify the scan tool parameter: Engine Coolant Pump Overtemperature = No
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Verify the component location is free of debris, clutter or any obstruction that may reduce airflow which could cause an overheat condition: G59 Engine Coolant Pump
      • If a condition exists - Repair or replace as necessary
      • If no condition exists - Replace the component: G59 Engine Coolant Pump
    • Go to next step: If the specified state 
  15. Perform the scan tool control function: Engine Coolant Pump - Command the component to the maximum position/speed

    Verify a condition does not exist with the component: G59 Engine Coolant Pump - Turns Off

    Perform the action while monitoring the component:

    • Wiggle the harness and connector: G59 Engine Coolant Pump
    • Wiggle the harness and connector: K20 Engine Control Module
    • If a condition exists 

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

    • Go to next step: If no condition exists 
  16. 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 
  17. All OK.
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