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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission - 8L90 (M5U MQD) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Transmission Control Wiring Harness Replacement >> Installation Procedure

Installation Procedure

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  1. GM3816771Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The new replacement wiring harness may not have electrical connector (2). It will be a one piece harness.

    Install automatic transmission control wiring harness (4).

  2. If necessary, install the control valve body to the transmission. Control Valve Body Replacement 
  3. Connect the wiring harness clips to the valve body and case.
  4. Connect the transmission control wiring harness connectors.
  5. If equipped, ensure the valve body connector retainer (3) is latched.
  6. GM3794350Courtesy of GENERAL MOTORS COMPANY

    Install the transmission fluid filter (4). Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement (Except LWN Diesel) .