Transfer Case Neutral Indicator Hard Fault Present
Your transfer case's neutral position sensor is sending a faulty signal to the engine computer, like a light switch that's stuck or broken. The vehicle won't properly detect when the transfer case is in neutral.
The ECU monitors the transfer case neutral indicator switch voltage signal to confirm the transfer case is in neutral position. When the switch closes, it should pull voltage to ground; when open, it should read high. A hard fault means the signal is consistently illogical or absent.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch voltage signal | 0.2V (closed/neutral) or 5V (open/in gear) | Voltage stuck between 1-4V or no signal |
| Signal continuity | Clean transitions between states | Intermittent or no state changes detected |
Code P1713 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, P1713 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.