Not in P or N During KOEO / KOER
Your transmission isn't telling the engine it's in Park or Neutral when it should be. Think of it like your car's brain expecting a 'ready' signal that never comes during startup or running.
The ECM monitors the transmission range switch signal during Key-On Engine-Off (KOEO) and Key-On Engine-Running (KOER) states to verify the vehicle is in Park or Neutral. The signal voltage should match expected ranges for these gears, indicating the shifter position is correctly detected.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Transmission Range Switch Signal | P/N position signal present (specific voltage 0.5-4.5V depending on transmission) | Signal absent or indicates other gear during KOEO/KOER |
| Shift Solenoid Response | Solenoid energizes/de-energizes correctly in P/N | No solenoid response or incorrect response detected |
Code P1711 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, P1711 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.