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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (3 Of 5)) >> Diagnostic Information and Procedures >> DTC P062D >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Verify the fuse is not open: F90UA Fuse@X50A Fuse Block - Underhood
    • If the fuse is open 
    1. Disconnect the electrical connector: X1@K20 Engine Control Module
    2. Test for infinite resistance between the test points: Output terminal@F90UA Fuse & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K20 Engine Control Module
    • Go to next step: If the fuse is not open 
  3. Disconnect the electrical connector: X1@K20 Engine Control Module
    4. NOTE:

    A high resistance condition on the component circuits may cause the DTC to set.

  4. Test for less than 2 ohms between the test points:
    • {Sierra/Silverado}Ignition circuit terminal 46@Control module harness & Output terminal@F90UA Fuse
    • {Escalade/Tahoe/Yukon}Ignition circuit terminal 69@Control module harness & Output terminal@F90UA Fuse
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

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