Diagnostic Test

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CHECK THE HYDRAULIC SYSTEM

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Repair

Check the transmission hydraulic fluid level.
Check the transmission hydraulic system for leaks. Repair as necessary.
Check the operation of the hydraulic pump.
If no problems are found with the transmission hydraulic system, and using the schematics as a guide, check the fuses and 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 .