The P1705:00 diagnostic trouble code in Ford vehicles signifies a Transmission Range (TR) Sensor Circuit Malfunction, often linked to issues with the gear selector position sensor or related wiring. This code can trigger erratic shifting, no-start conditions, or illuminated check engine lights.
Causes
- Failed transmission range sensor due to wear, contamination, or internal electrical faults.
- Damaged or corroded wiring harness, such as shorts, opens, or frayed insulation in sensor circuits.
- Poor electrical connections at sensor connectors, plug-ins, or grounds, causing signal interference.
- Defective powertrain control module (PCM) unable to process sensor input accurately.
- Incorrect installation or calibration after transmission repairs or component replacement.
Repair Solutions
Diagnose and resolve the P1705:00 code using a systematic approach:
- Scan and document live data with an OBD-II scanner to monitor sensor voltage signals for inconsistencies.
- Inspect the transmission range sensor physically for cracks, leaks, or misalignment; test resistance and voltage output using a multimeter.
- Check wiring and connectors for damage or corrosion; repair or replace any compromised sections with heat-shrink tubing or OEM parts.
- Reset the PCM after repairs to clear the code; perform a relearn procedure if needed for sensor calibration.
- Replace faulty components like the sensor, PCM, or harness if diagnostic tests confirm failure, adhering to service specifications.
Always conduct a post-repair test drive to verify resolution and ensure no recurrence of symptoms.
