Shift Solenoid C Performance or Stuck Off
The transmission's shift solenoid C is not responding properly, similar to a stuck valve that won't open or close when commanded. This prevents the transmission from shifting smoothly into certain gears.
The ECM commands solenoid C to energize and de-energize during gear transitions, monitoring the resulting hydraulic pressure changes. It detects a fault when the solenoid doesn't respond within expected timing or pressure parameters, indicating electrical failure or mechanical stiction.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Response Time | 50-150 milliseconds activation | No response or >200ms delay |
| Transmission Line Pressure | Pressure change within 0.5 seconds of solenoid command | No pressure change or slow response after command |
Code P0765 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0765 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.