Pressure Control Solenoid C Performance or Stuck off
The transmission's pressure control solenoid C isn't opening or closing properly, preventing the right hydraulic pressure from reaching transmission clutches. Think of it like a stuck water valve that won't let fluid flow through correctly.
The ECM monitors the solenoid's ability to modulate transmission fluid pressure by measuring current draw and comparing actual pressure feedback against commanded values. If pressure doesn't respond as expected or the solenoid coil resistance is out of range, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Current Draw | 0.5–2.0 amps at command | No current response or excessive draw |
| Transmission Fluid Pressure | Within spec for gear selection | Pressure remains high or fails to build |
Code P0796 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, P0796 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.