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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 >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
  1. GM3794350Courtesy of GENERAL MOTORS COMPANY

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

  2. GM3816771Courtesy of GENERAL MOTORS COMPANY

    Release the transmission control wiring harness connectors.

  3. Carefully disconnect the wiring harness clips from the valve body and case.
  4. NOTE:

    If replacing the wiring harness, the new wiring harness may not have electrical connector (2). If it does not have electrical connector (2), the control valve body will have to be removed.

  5. If necessary, remove the control valve body from the transmission. Control Valve Body Replacement 
  6. NOTE:

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

  7. Remove the transmission control wiring harness (4).