Diagnostic Test

CHECK THE GATE SELECT ACTUATOR OPERATION 

View Repair.

Repair 

• Check the transmission valve body gate select actuator for binding, sticking, or restricted movement. Repair as necessary.
• If no problems are found with the transmission valve body gate select actuator, and using the schematics as a guide, check the Transmission Control Module (TCM) terminals and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Information Tune-ups or Service Bulletins for possible causes that may apply. If no problems are found, replace and program the Transmission Control Module (TCM) in accordance with the Service Information.
• Perform the C635 DDCT VERIFICATION TEST. Refer to STANDARD PROCEDURE .