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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F: Cylinder Injector High Control Circuit Shorted To Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, all vehicle systems OFF, disconnect the X3 harness connector at the K20 Engine Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for greater than 3 Ω between the appropriate fuel injector high control circuit and direct low control circuit at the engine control module connector.
    • If 3 Ω or less 
    1. Disconnect the Q17 Fuel Injector.
    2. Test for infinite resistance between the fuel injector high control circuit and low control circuit.
      • If less than infinite, repair the short in the circuit.
      • If infinite, test or replace the Q17 Fuel Injector.
    • Go to next step: If greater than 3 Ω 
  3. Test or Replace the K20 Engine Control Module.
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