Control Solenoid Valve and Transmission Control Module Assembly Replacement. GMC Truck Yukon XL Denali 2008

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2008 🢒 Yukon XL Denali 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Control Solenoid Valve and Transmission Control Module Assembly Replacement

Removal Procedure

Remove the transmission fluid filter and auxiliary fluid pump filter. Refer to Automatic Transmission Fluid Filter and Auxiliary Fluid Pump Filter Replacement.
Remove the transmission electrical connector passage sleeve. Refer to Automatic Transmission Electrical Connector Passage Sleeve Replacement.

Remove the transmission wiring harness from the wire harness retainer (2).
Remove the transmission wiring harness connector (1) from the wire harness retainer.
Disconnect the transmission wiring harness from the control solenoid valve body (3).

Remove the control solenoid valve heat sink bolts (1) from the control solenoid valve and transmission control module (TCM) assembly.
Remove the wire harness retainer (2).
Remove the control valve body bolts (3) from the control solenoid valve and TCM assembly.
Remove the control solenoid valve and TCM assembly (4).

Notice: Use care when handling the control valve body assembly. If dropped, damage to the control solenoid valve body assembly internal components, including the transmission control module (TCM), may result.

Notice: Discard the channel plate. Replace with a NEW channel plate. Reusing an old channel plate may cause damage to the control solenoid valve assembly.

Important: Use care when removing the channel plate assembly. However, if a retaining tab is broken or missing, DO NOT replace the control solenoid valve assembly. The channel plate assembly can still be adequately aligned.

Remove the control valve channel plate spacer plate gasket (1).
Remove the transmission wiring harness assembly (2).

Installation Procedure

Notice: Discard the channel plate. Replace with a NEW channel plate. Reusing an old channel plate may cause damage to the control solenoid valve assembly.

Important: Use care when installing the channel plate assembly. However, if a retaining tab is broken or missing, DO NOT replace the control solenoid valve assembly. The channel plate assembly can still be adequately aligned.

Install the control valve channel plate spacer plate gasket (1).
Install the transmission wiring harness assembly (2).

Install the control solenoid valve and TCM assembly (4).

Important: Do not tighten the bolts at this time.

Install by hand the control valve body bolts (3) to the control solenoid valve and TCM assembly.
Install the wire harness retainer (2).

Important: Do not tighten the bolts at this time.

Install by hand the control solenoid valve heat sink bolts (1) to the control solenoid valve and TCM assembly.

Notice: Refer to Fastener Notice in the Preface section.

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.

Torque the bolts following the specified sequence.

Tighten
Tighten the control valve body bolts to 11 N·m (97 lb in).

Tighten
Tighten the control solenoid valve heat sink bolts to 7 N·m (62 lb in).

Connect the transmission wiring harness to the control solenoid valve body (3).
Install the transmission wiring harness connector (1) to the wire harness retainer.
Install the transmission wiring harness to the wire harness retainer (2).
Install the transmission electrical connector passage sleeve. Refer to Automatic Transmission Electrical Connector Passage Sleeve Replacement.
Install the transmission fluid filter and auxiliary fluid pump filter. Refer to Automatic Transmission Fluid Filter and Auxiliary Fluid Pump Filter Replacement.
Lower the vehicle.