Chevrolet Trax: Control valve body cover replacement

Removal Procedure

1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
3. Remove the front bumper fascia opening lower cover. Refer to Front Bumper Fascia Opening Lower Cover Replacement (Trax) .
4. Remove the left front wheel house liner. Refer to Front Wheelhouse Liner Replacement (Trax) , Front Wheelhouse Liner Replacement (Encore) .
5. Drain the transmission fluid.
6. Disconnect the transmission fluid cooler inlet pipe from the transmission. Refer to Transmission Fluid Cooler Inlet Pipe Replacement .
7. Disconnect the transmission fluid cooler outlet pipe from the transmission Refer to Transmission Fluid Cooler Outlet Pipe Replacement .

Fig. 34: Identifying Control Valve Body Transmission Control Module (TCM) Electrical Connector

8. Disconnect the control valve body transmission control module electrical connector (1), then unclip the wiring harness from the cover.

Fig. 35: View Of Control Valve Body

9. Remove the control valve body cover bolts (1).
10. Remove the control valve body cover (2).
11. Remove the control valve body cover gasket (3).

CAUTION: Support the control solenoid valve assembly around the connector when removing the seal. Excessive pulling force can damage the internal electrical connections.

12. Remove the control valve body cover wiring connector hole seal (4).
13. Remove all traces of the old gasket material. Clean the transmission case and control valve body cover gasket surfaces.

Installation Procedure

Fig. 36: View Of Control Valve Body

1. Install the control valve body cover wiring connector hole seal (4).
2. Install the control valve body cover gasket (3) to the control valve body cover.
3. Install the control valve body cover (2).
4. Hand start the control valve body cover bolts (1).

Fig. 37: Identifying Valve Body Cover Bolt Tightening Sequence

CAUTION: Refer to Fastener Caution .

NOTE: Install all control valve body cover bolts and studs by hand then torque all bolts and studs in sequence.

5. Install the control valve body cover bolts. Tighten the bolts in sequence to 12 (106 lb in).

Fig. 38: Identifying Control Valve Body Transmission Control Module (TCM) Electrical Connector

6. Connect the control valve body transmission control module electrical connector (1), then clip the wiring harness to the cover.
7. Raise the vehicle.
8. Connect the transmission fluid cooler outlet pipe to the transmission Refer to Transmission Fluid Cooler Outlet Pipe Replacement .
9. Connect the transmission fluid cooler inlet pipe to the transmission. Refer to Transmission Fluid Cooler Inlet Pipe Replacement .
10. Install the left front wheel house liner. Refer to Front Wheelhouse Liner Replacement (Trax) , Front Wheelhouse Liner Replacement (Encore) .
11. Install the front bumper fascia opening lower cover. Refer to Front Bumper Fascia Opening Lower Cover Replacement (Trax) .
12. Fill the transmission with correct fluid.
13. Check transmission fluid level. Refer to Transmission Fluid Level and Condition Check .
14. Lower the vehicle.
15. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
16. Check for leaks.

CONTROL VALVE BODY REPLACEMENT

Fig. 39: View Of Control Valve Body

Control Valve Body Replacement

OUTPUT SPEED SENSOR REPLACEMENT

Fig. 40: Identifying Output Speed Sensor

Output Speed Sensor Replacement

INPUT SPEED SENSOR REPLACEMENT

Removal Procedure

1. Remove the control valve body. Refer to Control Valve Body Replacement.

Fig. 41: Identifying Input Speed Sensor Mounting Bolt

2. Remove the input speed sensor bolt (2) M6 x 23.
3. Unlock the 2 retaining tabs inside the transmission housing.
4. Remove the input speed sensor (3).
5. Remove the 3 input speed sensor seals (1).

Installation Procedure

Fig. 42: Identifying Input Speed Sensor Mounting Bolt

1. Install the 3 input speed sensor seals (1).
2. Install the input speed sensor (3).
3. Verify that the retaining tabs are locked completely.

CAUTION: Refer to Fastener Caution .

4. Install the input speed sensor bolt (2) M6 x 23 and tighten to 9 (80 lb in).
5. Install the control valve body. Refer to Control Valve Body Replacement.
6. Perform the transmission adaptive values learn procedure. Refer to Transmission Adaptive Values Learn .

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