P1706 Fault Code in Mahindra: Causes, Symptoms, and Fixes

Fault code P1706 is also tied to the automatic transmission / starting system. Its exact definition changes by manufacturer, but here are the common ones:

Common Definitions of P1706

1. Nissan / Infiniti:
P1706 – Park/Neutral Position (PNP) Switch Circuit Malfunction
2. Ford / Mazda / Jaguar / Land Rover:
P1706 – Transmission Range Switch (TRS) Circuit Fault / Clutch Pedal Switch Malfunction (on manual models)
3. Hyundai / Kia:
P1706 – Inhibitor Switch Input Malfunction

Causes

1. Faulty Park/Neutral Position (PNP) switch or Transmission Range Sensor (TRS).
2. Misaligned or worn gear selector linkage.
3. Damaged/corroded wiring or connectors between switch and TCM/ECM.
4. Low battery voltage or poor ground.
5. Rare: internal TCM fault.

Symptoms

1. No-crank / no-start unless gear lever is wiggled.
2. Transmission warning light or Check Engine Light (CEL).
3. Gear indicator on dashboard may show wrong gear.
4. Vehicle might only start in Neutral but not in Park.
5. Limp mode or harsh gear shifting (less common).

Fix / Diagnosis

1. Try starting car in Neutral – if it works but not in Park, the PNP/TRS switch is likely faulty or misaligned.
2. Inspect inhibitor switch / TRS and linkage adjustment.
3. Check wiring & connectors for corrosion or loose pins.
4. Test the switch with a multimeter across positions.
5. Replace the PNP / TRS if defective.
6. Clear codes and test drive.