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The diagnostic trouble code P0761:00-64 refers to a performance issue or a stuck off condition in the Shift Solenoid C (SSC) of the automatic transmission system. The shift solenoids are responsible for controlling the engagement of different gears in the transmission.

Here are some possible causes and solutions for this issue:

1. Faulty shift solenoid C: The shift solenoid C may be malfunctioning or stuck in the off position. This can cause improper shifting and affect the performance of the transmission. A professional mechanic should perform diagnostic tests to identify and replace the faulty shift solenoid.
2. Wiring or connector problems: Inspect the wiring harness and connectors associated with the shift solenoid C. Look for any signs of damage, such as frayed wires, loose connections, or corrosion. Repair or replace any damaged wiring or connectors as needed.
3. Low transmission fluid level: Insufficient transmission fluid can lead to improper operation of the shift solenoids. Check the transmission fluid level and ensure it is at the appropriate level. If it is low, refill it to the recommended level and inspect for any leaks that may be causing the fluid loss.
4. Dirty or contaminated transmission fluid: Dirty or contaminated transmission fluid can affect the performance of the shift solenoids and cause them to stick or operate improperly. Consider performing a transmission fluid flush and filter replacement to ensure clean fluid is circulating in the system.
5. Check for other transmission issues: A malfunctioning shift solenoid can sometimes be a symptom of other underlying transmission problems. It is recommended to have a professional mechanic or transmission specialist perform a thorough diagnosis of the transmission system to identify any additional issues that may need to be addressed.

It is important to note that these are general suggestions, and the specific diagnostic and repair procedures may vary depending on the make, model, and year of your vehicle. If you are unsure or uncomfortable performing these steps yourself, it is recommended to seek assistance from a qualified mechanic or dealership. They will have the expertise and tools to accurately diagnose and resolve the performance or stuck off condition in Shift Solenoid C (SSC).