P0760 — Shift Solenoid C Malfunction

Diagnostic algorithm

1. Verify code and record freeze-frame/live data with a capable scan tool. Note vehicle symptoms and any other transmission/TCM codes.
2. Check transmission fluid level and condition; correct level and replace/filter if contaminated.
3. Visually inspect solenoid harness and connector for damage, corrosion or loose pins; repair as needed.
4. Disconnect solenoid connector and measure coil resistance at the solenoid. Compare to factory spec. Replace solenoid if out of range.
5. With connector disconnected, check for battery feed and ground continuity from harness to the TCM using a multimeter. Check for short to battery or ground.
6. Backprobe connector with scan tool monitoring while commanding gear changes (or using manual shift). Verify the TCM is sending expected voltage/PWM signals and that the solenoid responds.
7. Wiggle-test wiring while monitoring live data for intermittent faults. Repair wiring or connectors if intermittent behavior occurs.
8. If wiring and solenoid test good but code persists, inspect valve body and solenoid valve/sleeve for contamination or sticking; perform pan drop and filter change if required.
9. If hydraulic and electrical components check good, consider TCM driver fault — verify TCM grounds and power, reflash or replace TCM if supported by diagnostics.
10. After repairs, clear codes, perform road test and re-scan to confirm the issue is resolved. Follow manufacturer service manual for exact specs and procedures.