What does it mean?
P1707 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Park/Neutral (P/N) switch circuit failure .
Symptoms
- MIL on
- Starter turns with the selector in a driving gear, or the engine will not crank in park
- Reverse lights inoperative
- Idle speed dipping or surging when drive is engaged
- Cluster gear display wrong or missing
- Fault appearing and disappearing over road bumps
Likely causes
- Park and neutral switch contacts burnt or worn so the signal drops out
- Switch out of adjustment after transmission, linkage or clutch work
- Open or shorted wire between the switch and the module
- Water, salt and road dirt corroding the switch connector
- Broken or loose switch mounting bracket letting the switch shift position
- Poor ground reference for the switch circuit
- Starter interlock circuit fault feeding back into the same signal
How to fix it
- Monitor the park and neutral signal in live data while moving the selector slowly through park and neutral
- Check and adjust the switch position, since many switches are slotted for alignment
- Inspect the connector for corrosion and moisture, then clean it and protect it against water
- Measure switch continuity in park and neutral directly at its connector
- Test the circuit to the module for open, short to ground and short to battery conditions
- Check the switch mounting bracket and hardware for looseness or damage
- Replace the switch if the contacts are unreliable, then verify the starter interlock works correctly