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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0601-P0604, P0606, P0607, P060A, P062F, P16F3, P16F4, or P16FB >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0602 is not set.
    • If the DTC is set 
    1. Perform all necessary programming and setup procedures for the control module: K71 Transmission Control Module
    2. Verify the DTC does not set.
      • If the DTC sets - Replace the component: K71 Transmission Control Module
      • Go to next step: If the DTC does not set
    3. All OK.
    • Go to next step: If the DTC is not set 
  3. Ignition/Vehicle & All vehicle systems - Off
  4. Disconnect the electrical connector: K71 Transmission Control Module

    Verify the following conditions do not exist:

    • Defective
    • Loose
    • Poor Connection
    • Visible Damage
    • If a condition exists 

      Repair or replace as necessary.

    • Go to next step: If no condition exists 
  5. Connect the electrical connector: K71 Transmission Control Module
  6. Ignition - On / Vehicle - In Service Mode
  7. Clear the DTCs.
  8. Ignition/Vehicle & All vehicle systems - Off
  9. Ignition - On / Vehicle - In Service Mode
  10. Verify DTC P0601, P0603, P0604, P0606, P0607, P060A, P062F, P16F3, P16F4, P16FB is not set.
    • If the DTC is set 

      Replace the component: K71 Transmission Control Module

    • Go to next step: If the DTC is not set 
  11. All OK.
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