TRS Circuit Intermittent Malfunction
Your transmission range sensor is sending an unstable or flickering signal to the engine computer, like a light switch that keeps turning on and off randomly. This intermittent connection prevents the ECU from reliably knowing which gear you're in.
The ECU monitors voltage signals from the Transmission Range Sensor (TRS) to determine gear position. It expects stable, distinct voltage levels for Park, Reverse, Neutral, and Drive. An intermittent malfunction occurs when the signal fluctuates, drops out briefly, or fails to match expected thresholds, causing the ECU to lose confidence in gear state.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| TRS Voltage Signal | Stable position-specific voltage (0.5-4.5V depending on gear) | Signal dropout, noise, or erratic transitions between expected values |
| Signal Continuity | Continuous, steady reading for selected gear | Intermittent drops or glitches in signal stability |
Code P1707 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, P1707 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.