TP (Mechanical) Circuit Malfunction
Your throttle position sensor or its mechanical linkage is broken or disconnected, like a stuck gas pedal that won't report its position to the engine computer. The engine can't properly control fuel delivery because it doesn't know where the throttle actually is.
The ECM monitors the throttle position sensor voltage output to verify mechanical throttle plate movement matches electrical signal. It detects inconsistencies between expected and actual throttle positions using redundant sensor inputs or comparison against other parameters.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| TP Sensor Voltage | 0.5V - 4.5V (proportional to throttle opening) | Voltage stuck, erratic, or outside expected range for current operation |
| Throttle Plate Movement | Smooth response to pedal input | No movement detected or mechanical binding/resistance |
Code P1795 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, P1795 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.