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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 43 (Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Repair Instructions - On Vehicle) >> Repair Instructions - On Vehicle >> Control Valve Body Replacement (M5N) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Valve Body Torx Plus Bolt Tightening Sequence
    GM3816870Courtesy of GENERAL MOTORS COMPANY
  1. Using DT-48285   Valve Body Torx Plus Socket install the valve body (3) and the valve body assembly bolts (1,2) in the transmission.
  2. Tighten the bolts (1 - M6 x 68) and bolts (2 - M6 x 45) to 9 N.m (80 lb in) in the sequence shown.
  3. Fig 2: Retainer
    GM3817155Courtesy of GENERAL MOTORS COMPANY
  4. Install the transmission fluid pump driven sprocket (1). Refer to automatic transmission fluid baffle and driven sprocket in Control Valve Assembly and Transmission Wiring Harness Installation .
  5. Fig 3: Manual Shaft Detent Lever Spring
    GM3816495Courtesy of GENERAL MOTORS COMPANY
  6. Install the manual shaft detent lever spring (2) and the manual shaft detent lever spring retaining bolt (1) then tighten to 12 N.m (106 lb in).
  7. Fig 4: Manual Valve
    GM3816802Courtesy of GENERAL MOTORS COMPANY
  8. Connect the manual valve (1) to the manual shift shaft position switch assembly linkage (2).
  9. Fig 5: Transmission Fluid Baffle
    GM3816731Courtesy of GENERAL MOTORS COMPANY
  10. Install the transmission fluid baffle (2). Transmission Fluid Baffle Replacement 
  11. Install the auxiliary fluid accumulator. Auxiliary Fluid Accumulator Replacement 
  12. Fig 6: Transmission Fluid Filter
    GM3794350Courtesy of GENERAL MOTORS COMPANY
  13. Install the transmission fluid filter (4). Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement (Rear Wheel Drive) Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement (All Wheel Drive) 
  14. Reprogram the transmission. Solenoid Valve Characterization Reprogramming
  15. NOTE:

    The Service Fast Learn procedure must be performed when one of the following repairs have been made to the vehicle. Failure to perform the procedure after one of the following repairs may result in poor transmission performance, as well as transmission DTCs being set:

    The service fast learn procedure must be performed when any of the following repairs has been made to the transmission.

    • Pressure regulating solenoid replacement
    • Valve body repair or replacement
    • Any service/repair in response to a shift quality concern
    • Any internal transmission service, repair, overhaul, or replacement
    • Torque converter replacement
    • TCM replacement
    • Transmission assembly replacement
  16. Perform the service fast learn procedure. Refer to Transmission Service Fast Learn Procedure .