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The diagnostic trouble code P0762:00-64 indicates that the Shift Solenoid C (SSC) is stuck in the on position. The shift solenoids are responsible for controlling the engagement of different gears in the automatic transmission system.

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 on 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. Check for transmission fluid contamination: Contaminated transmission fluid can cause the shift solenoids to stick in the on position. Inspect the transmission fluid for signs of contamination, such as debris or excessive metal particles. If the fluid appears dirty or contaminated, consider performing a transmission fluid flush and filter replacement.
4. Check for other transmission issues: A stuck-on shift solenoid C 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.
5. Check the transmission control module: The transmission control module (TCM) controls the operation of the shift solenoids. A malfunctioning TCM can cause the solenoids to become stuck. A professional mechanic should perform diagnostic tests to determine if the TCM is functioning properly and replace it if necessary.

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 issue with the stuck-on condition of the Shift Solenoid C (SSC).