P0705 Toyota
p0705 transmission range sensor circuit malfunction pRNDL input
The P0705 error code on a Toyota vehicle indicates a Transmission Range Sensor Circuit Malfunction. This sensor communicates the gear position (P, R, N, D, etc.) to the vehicle’s ECU, and when it malfunctions, it can cause significant drivability issues.
Symptoms of P0705
- Difficulty shifting gears or erratic gear shifts.
- Engine may fail to start or struggle to engage in “Park” or “Neutral”.
- Vehicle entering limp mode, restricting acceleration and speed.
- Transmission warning light or Check Engine Light illuminating.
- Poor acceleration or inability to move into certain gears.
Common Causes
- Faulty Transmission Range Sensor (TRS): The sensor itself may wear out over time.
- Wiring Issues: Damaged, shorted, or corroded wires connecting the TRS to the ECU can trigger the code.
- Misaligned Shift Linkage: Mechanical misalignment can cause the sensor to send incorrect signals.
- Low Transmission Fluid: Insufficient fluid can cause transmission components, including sensors, to malfunction.
- Defective ECM/TCM: Software issues or hardware faults in the Transmission Control Module (TCM) or Engine Control Module (ECM) may trigger the code.
Fixes for P0705
- Check and Replace TRS: Inspect the Transmission Range Sensor and replace it if faulty.
- Wiring Repairs: Fix or replace any damaged wiring and connectors to ensure proper electrical signals.
- Adjust Shift Linkage: Ensure that the gear shift linkage is correctly aligned.
- Transmission Fluid Maintenance: Check and refill or replace low or contaminated transmission fluid.
- Reprogram or Replace TCM/ECM: In rare cases, the transmission module may require reprogramming at a dealership or specialized workshop.
Cost of Repairs
- TRS Replacement: $100–$350
- Wiring Repairs: $50–$550
- Shift Linkage Adjustment: $50–$250
- Valve Body Replacement (if needed): $300–$1,000
Precaution
It’s important to address this issue promptly, as prolonged driving with a P0705 code can cause further damage to the transmission, and you risk being stranded if the car enters limp mode or fails to start.
For accurate diagnosis and repair, it’s recommended to scan for additional fault codes and consult a professional mechanic with the appropriate tools.