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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 404 (Engine Controls And Fuel - 6.2L (LT4) - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information And Procedures >> DTC P103B or P103C >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: X2@K20 Engine Control Module
  3. Test circuit 5294 for an open/high resistance between the test points: Ignition circuit terminal X2 37@Control module harness & Output terminal@Fuse
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit:

    • Go to next step: If less than 2 ohms 
  4. Replace the component: K20 Engine Control Module
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