Transmission Fluid Pressure Sensor/Switch F Circuit High
The transmission fluid pressure sensor is sending a signal that's too high, like a gauge needle stuck at maximum. The ECU thinks pressure is higher than physically possible, indicating a wiring or sensor problem.
The ECU monitors the voltage signal from the transmission fluid pressure sensor to verify actual hydraulic pressure. When the sensor voltage exceeds the maximum expected threshold (typically 4.8-5.0V), the ECU flags a high circuit fault. This usually indicates a short to power, corroded connector, or failed sensor.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage | 0.5V - 4.5V (proportional to pressure) | >4.8V (stuck high or shorted) |
| Pressure Range | 10-400 PSI depending on gear | Signal indicates impossible pressure value |
Code P0995 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, P0995 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.