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Home >> Cadillac >> 2018 >> CTS V >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Repair Instructions - On Vehicle >> Repair Instructions - On Vehicle >> Control Valve Body Replacement >> Installation Procedure

Installation Procedure

  1. Fig 1: Identifying Valve Body Torx Plus Bolt And Valve Body Assembly (With Tightening Sequence)
    GM3816870Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Before installing the control valve solenoid body onto the transmission, document the 16-digit Part Unique Number (PUN). If the control valve solenoid body PUN has not been saved for reference, it may be necessary to disassemble the control valve solenoid body from the transmission to clearly read the control valve solenoid body PUN.

    Using DT-48285  Valve Body Torx Plus Socket install the valve body (3) and the 11 valve body assembly bolts (1, 2) in the transmission.

  2. CAUTION:

    Refer to Fastener Caution .

  3. Tighten the 7 bolts (1 - M6 x 68) and the 4 bolts (2 - M6 x 45) to 9 N.m (80 lb in) in the sequence shown.
  4. GM3817155Courtesy of GENERAL MOTORS COMPANY

    Using a suitable pry tool, lock the retainer (2).

  5. 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 .
  6. GM3816771Courtesy of GENERAL MOTORS COMPANY

    Install the transmission control wiring harness (4). Transmission Control Wiring Harness Replacement (M5U) 

  7. GM3816802Courtesy of GENERAL MOTORS COMPANY

    Connect the manual valve (1) to the manual shift shaft position switch assembly linkage (2).

  8. Return the spring (2) to it's correct position.
  9. GM3816495Courtesy of GENERAL MOTORS COMPANY

    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).

  10. GM3816731Courtesy of GENERAL MOTORS COMPANY

    Install the transmission fluid baffle, then install the 2 NEW fluid baffle bolts. Transmission Fluid Baffle Replacement 

  11. Fig 2: Exploded View Of Transmission Fluid Pan, Filter, Filter Seal, Gasket And Bolts (With Tightening Sequence)
    GM3794350Courtesy of GENERAL MOTORS COMPANY

    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) 

  12. Reprogram the transmission. Solenoid Valve Characterization Reprogramming
  13. 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
  14. Perform the service fast learn procedure. Transmission Service Fast Learn Procedure