Shift Solenoid C Intermittent
The transmission's C solenoid is cutting in and out intermittently, like a light switch that flickers instead of staying on. This disrupts smooth gear shifting because the solenoid can't reliably control fluid pressure to engage the right gear.
The ECM monitors the solenoid's electrical command voltage and the resulting hydraulic pressure feedback from transmission sensors. It expects a consistent on/off signal and stable pressure response within specific timing windows. When the solenoid fails to respond reliably to commands, the ECM logs an intermittent fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Command Signal | 12V when active, 0V when inactive | Erratic voltage fluctuations or no response to commands |
| Pressure Response Time | 50-200ms pressure rise after command | Delayed or missing pressure response |
Code P0768 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, P0768 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.