P1706 is a manufacturer-specific powertrain code. Its exact definition and the monitored system depend entirely on the vehicle make and model.
Because it applies to entirely different systems across manufacturers, the exact factory definition must be verified before diagnosis. This code identifies a detected fault condition but does not automatically prove that a specific component has failed.
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Key Takeaways
- P1706 is a manufacturer-specific code with entirely different meanings depending on the vehicle make and application.
- On some Nissan and Infiniti applications, it indicates a Park/Neutral Position (PNP) switch circuit malfunction.
- On certain Honda and Acura applications, it points to an open circuit in the transmission range switch.
- Accurate diagnosis requires verifying the exact factory definition for your specific vehicle before testing any components.
P1706 Code Description and Implications
P1706 is a manufacturer-specific diagnostic trouble code. Because it is not standardized across all vehicles, its exact definition and the monitored system depend entirely on the manufacturer and application.
Some Nissan and Infiniti applications: P1706 indicates a Park/Neutral Position (PNP) switch circuit malfunction or no signal change. The control module detects that the PNP switch signal does not change state when the gear selector is moved.
Certain Honda and Acura applications: P1706 represents an open circuit in the transmission range switch. The powertrain control module detects a lack of continuity or an open signal path in the gear selection circuit.
Specific Ford applications: P1706 can indicate a high vehicle speed observed in park or a manual lever position sensor indicating park during operation.
Common Causes of the P1706 Code
Because P1706 applies to entirely different systems depending on the vehicle, the possible causes vary significantly by application.
For Nissan/Infiniti PNP switch applications: Possible causes include a misadjusted or failed Park/Neutral Position switch, damaged wiring, or a corroded connector at the switch.
For Honda/Acura transmission range applications: An open circuit in the wiring harness, a failed transmission range switch, or a poor electrical connection can trigger this code.
For Ford manual lever position applications: A faulty manual lever position sensor, misadjusted shift linkage, or wiring issues may cause the control module to read an incorrect gear state.
Symptoms Associated With P1706
Symptoms depend heavily on which system the code is monitoring in your specific vehicle.
On applications monitoring the PNP or transmission range switch, the vehicle may fail to crank or start because the neutral safety circuit is interrupted.
On applications where the sensor monitors gear position for shift logic, the transmission may exhibit harsh shifts, fail to shift, or enter a limp mode.
MIL behavior varies by application. Some vehicles may illuminate the Check Engine Light, while others may store the DTC without commanding a primary warning light.
Diagnosing the P1706 Trouble Code
Diagnosis must begin by confirming the exact factory definition for your specific make, model, and engine using manufacturer service information.
Retrieve the code and record any freeze-frame data or related trouble codes using a scan tool capable of reading manufacturer-specific transmission data.
For Nissan/Infiniti applications, monitor the PNP switch state on the scan tool while moving the gear selector through all positions to verify signal changes.
For Honda/Acura applications, test the transmission range switch circuit for continuity and check for open circuits according to the manufacturer wiring diagram.
For Ford applications, verify the manual lever position sensor alignment and ensure the signal voltage matches the specified gear positions.
Repairing the P1706 Issue
Repairs must follow the confirmed root cause identified during system-specific testing.
If the Park/Neutral Position switch or transmission range switch fails the manufacturer diagnostic procedure, replace the confirmed faulty component and clear the codes.
If the switch is simply misadjusted, realign the switch to the transmission manual lever according to the exact manufacturer specification.
If wiring damage or an open circuit is found, repair or replace the affected harness section.
Always repair any damaged wiring or corroded connectors found during the diagnostic process before replacing major control modules.
Cost Considerations for P1706 Repairs
Repair costs for P1706 vary widely based on the underlying fault, the specific vehicle application, and local labor rates.
Replacing an external Park/Neutral Position switch or transmission range switch involves moderate parts costs and minimal labor time.
If the sensor is mounted inside the transmission or requires significant disassembly to access, labor time will increase.
Diagnostic time, required programming or relearn procedures, and exact parts pricing all influence the final expense.
Prevention Strategies for Future Occurrences
Keeping electrical connectors clean and ensuring wiring harnesses near the transmission linkage are securely routed can help prevent chafing or moisture intrusion.
On applications using a mechanical transmission range switch, ensuring the shift linkage remains properly adjusted can prevent excessive wear on the switch contacts.
Avoiding impact damage to the shift lever and linkage helps protect the external sensor from physical misalignment.
Troubleshooting Tips and Best Practices
Never assume P1706 relates to the transmission range sensor without first verifying the exact manufacturer definition for your vehicle.
Check for applicable technical service bulletins, as some manufacturers release updated switch part numbers or control module software recalibrations to address false gear position codes.
If multiple transmission or neutral safety codes are present alongside P1706, inspect the shared sensor grounds and main power supplies before replacing individual components.
Verify that aftermarket shift kits or modified shifters are not interfering with the factory sensor alignment or wiring.
More OBD-II Codes
| P1705 | P1704 | P1703 | P1702 |
| P1700 | P1695 | P1707 | P1708 |
| P1709 | P1711 | P1712 | P1713 |
| P0705 | P0706 | P0707 | P0708 |
| P0700 | P0711 | P0713 | P0714 |
| P0715 | P0716 | P0717 | P0720 |
Frequently Asked Questions
Is P1706 a generic or manufacturer-specific code?
No. P1706 is a manufacturer-specific code. Its exact definition and the monitored system depend entirely on the vehicle make, model, and application.
Can a P1706 code prevent my car from starting?
Yes. On applications where P1706 monitors the Park/Neutral Position switch, the vehicle may fail to crank because the control module cannot verify the transmission is in Park or Neutral.
Will P1706 clear itself if I adjust the shift linkage?
Not automatically. While adjusting the linkage or sensor may resolve the underlying mechanical fault, the stored code will typically require a scan tool to clear and reset the monitor.
Is it safe to drive with the P1706 code active?
It depends on the symptoms. If the vehicle shifts harshly, fails to shift, or displays incorrect gear positions, driving is unsafe. Always verify the exact application before driving.
Does P1706 always mean the transmission range sensor is bad?
No. While some applications use P1706 for transmission range sensor faults, others use it for Park/Neutral switch or manual lever position issues. Never replace the sensor without confirming the exact factory definition.
What Should You Do About the P1706 Code?
Confirm the exact factory definition and technical service bulletins for your specific vehicle application.
Follow the applicable manufacturer diagnostic procedure to test the relevant Park/Neutral Position switch, transmission range sensor, or related circuit based on your vehicle’s specific system architecture.
Repair or replace the confirmed failed component, then retest the system to ensure the code does not return.
