GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 XLR 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 6L50/6L80/6L90 🢒 Control Solenoid Valve and Transmission Control Module Assembly Replacement

Removal Procedure

    Important: The valve body must be removed from the transmission to replace the control solenoid valve and transmission control module assembly.


    Object Number: 1649733 Size: SH
  1. Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement .
  2. Remove the electrical connector passage sleeve. Refer to Automatic Transmission Electrical Connector Passage Sleeve Replacement .

    3. Object Number: 1685807 Size: SH
  3. Remove the valve body bolts (1).

    4. Object Number: 1685819 Size: SH
  4. Remove the upper and lower control valve body assembly.

    5. Object Number: 1758085 Size: SH
  5. Disconnect the speed sensor electrical connector (2) from the control solenoid valve assembly.
  6. Turn the control valve body assembly over.

    7. Object Number: 1758088 Size: SH

    Important: Release the connector lock before disconnecting.

  7. Disconnect the manual shift shaft position switch connector (4) from the control solenoid valve assembly.
  8. Remove the bolt (3) and remove the manual shift shaft position switch assembly.

    9. Object Number: 1758093 Size: SH
  9. Remove the 2 bolts (1) from the "heat sink" side of the control solenoid valve assembly.

    10. Object Number: 1758109 Size: SH
  10. Remove the 5 bolts (2) and the 4 bolts (1) securing the control solenoid valve assembly to the control valve body assembly.

    11. Object Number: 1758093 Size: SH
  11. Remove the control valve body assembly.

    12. Notice: Use care when removing or installing the filter plate assembly. A broken or missing retaining tab may not adequately secure the filter plate to the control solenoid valve assembly, resulting in possible damage or contamination.

  12. Carefully remove and discard the filter plate assembly (5).

Installation Procedure

    Object Number: 1758098 Size: SH

    Important: Inspect the 4 filter plate retaining tabs on the control solenoid valve assembly. A broken or missing tab may not adequately secure the filter plate to the control solenoid valve assembly.

  1. Install a NEW filter plate assembly (1).

    2. Object Number: 1758104 Size: SH

    Important: Note the locator pin on the control valve lower body assembly.

  2. Align the control solenoid valve assembly (1) to the control valve lower body assembly.
  3. Install the 2 bolts (2), through the "heat sink" side of the control solenoid valve assembly (1). Hand tighten only.

    4. Object Number: 1758109 Size: SH
  4. Install the 4 bolts (1) and 5 bolts (2) securing the control solenoid valve assembly to the control valve lower body assembly. Hand tighten only.

    5. Object Number: 1758114 Size: SH
  5. Install the manual shift shaft position switch assembly (1). Align the switch activator slide with the manual valve link. Secure with 1 bolt (3). Hand tighten only.

    6. Important: The wiring harness clip (4) on the manual shift shaft position switch does not need to be replaced if damaged or missing. The clip functions only as a manufacturing assembly aid to keep the harness clear during an automated bolt installation process. If the clip is damaged, simply remove and discard.

  6. Connect and lock the manual shift shaft position switch electrical connector (5) to the control solenoid valve assembly and attach the wiring harness clip (4).

    7. Object Number: 1758116 Size: SH
  7. Install the 5 remaining bolts (1) and 1 remaining bolt (2). Hand tighten only.

    8. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1758118 Size: SH

    Notice: Bolt torque sequencing is critical to the proper function of the control solenoid valve assembly. Failure to follow the required sequencing may result in transmission malfunction.

  8. Tighten all bolts in the sequence shown. The 2 "heat sink" bolts (17,18) must be tightened last.

    9. Tighten
    Tighten bolts to 8 N·m (6 lb ft).


    Object Number: 1754911 Size: SH
  9. Inspect the contact area between the "heat sink" area of the control solenoid valve assembly (1) and the valve body. There should be no visible gap. If a gap exists, loosen all 18 bolts and retighten in the sequence shown.

    10. Object Number: 1758854 Size: SH
  10. Inspect the 2 input and output speed sensor wiring harness clips (1) for damage. Replace if damaged.

    11. Object Number: 1758085 Size: SH
  11. Connect the speed sensor electrical connector (2) to the control solenoid valve assembly.

    12. Object Number: 1685819 Size: SH
  12. Install the upper and lower control valve body assembly. Refer to Control Valve Lower Body and Upper Body Replacement .
  13. Install the electrical connector passage sleeve. Refer to Automatic Transmission Electrical Connector Passage Sleeve Replacement .

    14. Object Number: 1649733 Size: SH
  14. Install the transmission oil pan and filter. Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement .

    15. Important: After an internal transmission repair or internal part replacement, the Service Fast Learn Adapt procedure should be performed. Refer to Service Fast Learn Adapts .

  15. Reset the transmission TAP values. Refer to Service Fast Learn Adapts .
  16. Refer to Control Module References for programming and setup information.