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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 88 (Automatic Transmission - 8L90 (M5U) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Automatic Transmission Wiring Harness Replacement (Electrical Connector Passage) >> Installation Procedure

Installation Procedure

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. Position the automatic transmission wiring harness into the transmission.
  2. GM3802175Courtesy of GENERAL MOTORS COMPANY

    Press the main connector into the transmission case until the four retaining tabs (1) around the main connector, lock into place.

  3. GM3802143Courtesy of GENERAL MOTORS COMPANY

    Connect the electrical connector (1).

  4. Install the control valve body. Control Valve Body Replacement .
  5. Connect the chassis wiring harness from the transmission electrical connector.
  6. Reprogram the transmission. Solenoid Valve Characterization Reprogramming
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