P0705 Technical Description
Transmission Range Sensor Circuit (PRNDL Input) Malfunction
In this guide, we’ll break down the P0705 trouble code, its symptoms, causes, and fixes. If you’re seeing this code, you want to understand it and how to fix it.
I’ve fixed this issue countless times in my garage.
We’ll cover what P0705 means, common symptoms like erratic shifting, and practical fixes to get you back on the road.
Let’s get started and clear up this code together.
Key Takeaways
- P0705 indicates a problem with the Transmission Range Sensor (TRS) circuit.
- Symptoms include the Check Engine Light, erratic shifting, and starting issues.
- Causes range from a faulty TRS to damaged wiring and PCM issues.
- Diagnosing involves inspecting the TRS, wiring, alignment, and PCM.
- Fixes may require sensor replacement, wiring repairs, or PCM adjustments.
- Ignoring the code can lead to severe transmission problems and safety risks.
Table of ContentsShow
What Does P0705 Trouble Code Mean?
The P0705 trouble code indicates an issue with the Transmission Range Sensor (TRS) circuit, also known as the Park/Neutral Position (PNP) switch.
This sensor is responsible for informing the Powertrain Control Module (PCM) of the gear position. It tells the PCM whether the transmission is in Park, Neutral, or any of the drive gears.
When the P0705 code is triggered, it means the PCM is receiving faulty or no input from the TRS. This can cause various problems, including erratic shifting, failure to start, or the inability to change gears.
Essentially, your car’s computer can’t accurately determine what gear the transmission is in, leading to a host of drivability issues.
The TRS is crucial for safe vehicle operation. It ensures that the engine starts only when the transmission is in Park or Neutral and prevents the vehicle from being started in gear, which could lead to accidents.
When the sensor malfunctions, the PCM can’t control these safety features effectively.
In many cases, the P0705 code is accompanied by a Check Engine Light. You might also notice that your car only starts in Neutral, or it might not start at all.
Other symptoms can include the transmission being stuck in one gear or not shifting smoothly.
The underlying issue could be due to a faulty TRS, damaged wiring, or a problem with the PCM itself.
Identifying the exact cause is crucial for resolving the code and restoring your vehicle’s normal operation.
Ignoring the P0705 code can lead to more severe transmission issues and compromise your vehicle’s safety.
P0705 Trouble Code Symptoms
When the P0705 code appears, you may notice the following symptoms:
- Check Engine Light is on
- Car only starts in Neutral
- Car fails to start
- Erratic or harsh shifting
- Transmission stuck in one gear
- Inaccurate gear display on the dashboard
P0705 Trouble Code Causes
Several issues can trigger the P0705 code:
- Faulty Transmission Range Sensor (TRS)
- Damaged or corroded wiring or connectors
- Misaligned TRS
- Malfunctioning Powertrain Control Module (PCM)
- Fluid contamination affecting sensor operation
How To Fix A P0705 Trouble Code
The P0705 trouble code indicates a malfunction in the transmission range sensor circuit, also known as the Transmission Range Sensor (TRS) or Neutral Safety Switch.
1.Check Transmission Fluid Level
Ensure the transmission fluid level is at the appropriate level. Low fluid levels can sometimes trigger false sensor readings.
2. Scan for Additional Codes
Use an OBD-II scanner to check for any additional trouble codes present in the vehicle’s system. Additional codes can provide further insight into related issues.
3. Inspect Wiring and Connectors
Visually inspect the wiring harness and connectors associated with the transmission range sensor. Look for any signs of damage, corrosion, or loose connections.
4. Test Transmission Range Sensor
Perform a diagnostic test on the transmission range sensor using a multimeter or a dedicated sensor tester. Follow the manufacturer’s guidelines for testing procedures specific to your vehicle’s make and model.
5. Replace Faulty Transmission Range Sensor
If the sensor is found to be faulty during testing, replace it with a new one. Ensure the replacement sensor is compatible with your vehicle’s make and model.
6. Repair or Replace Damaged Wiring
If any wiring or connectors are damaged or corroded, repair or replace them as needed. Make sure all connections are secure and free from corrosion.
7. Clear Error Codes
After completing the repair, use the OBD-II scanner to clear the trouble codes stored in the vehicle’s ECM or TCM. This will reset the system and allow for a fresh start.
8. Test Drive
Take the vehicle for a test drive to ensure the transmission is functioning properly and the trouble code does not reappear. Monitor the gear shifts and ensure there are no abnormal symptoms.
9. Perform Final Checks
Double-check all connections and wiring to ensure everything is properly secured and functioning as intended. Re-scan the vehicle for any remaining trouble codes to confirm the issue has been resolved.
By following these diagnostic and repair procedures, you can effectively address the P0705 trouble code and restore proper functionality to your vehicle’s transmission range sensor circuit. If you encounter any difficulties during the process, consider consulting a qualified mechanic or technician for further assistance.
Conclusion
Now you know what the P0705 trouble code means and how to fix it.
Have you ever dealt with a TRS issue before?
Share your experience or ask questions in the comments below!
