Transmission Indeterminate Failure (Failed to Neutral)
The transmission control module can't determine what gear the vehicle is in or confirm it shifted to neutral when commanded. Think of it like a light switch that won't reliably report whether it's on or off.
The ECM monitors transmission position sensor signals and shift solenoid response to verify gear selection. It compares actual transmission state against commanded state and expects confirmation within a specific timeframe. If signals remain indeterminate or conflict, the fault triggers.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Transmission Position Sensor Signal | 0.5-4.5V with clear state definition | Voltage unstable, missing, or contradictory between sensors |
| Neutral Detection Time | Neutral confirmed within 500ms of command | No neutral confirmation after 1500ms or inconsistent readings |
Code P1705 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, P1705 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.