P0705: OBD-2 error code interpretation and solutions

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Vehicle engine and/or automatic transmission

Code: P0705 - Transmission Range Sensor "A" Circuit (PRNDL Input)

Transmission problems always cause concern, but they do not always mean major difficulties. Code P0705 indicates that your vehicle’s engine control module (ECM) or transmission control module (TCM) has detected an error from the transmission range sensor (TRS).

This OBD code is common for various car brands, including Kia, Ford, Toyota, Nissan, Mercedes, Renault, BMW, Skoda, Volkswagen, and others.

Causes of OBD P0705

As with most sensor-related issues, P0705 has a relatively short list of possible causes. Here is what to check first:

Damaged, worn, or corroded TRS wiring or connectors.
Faulty/damaged TRS.
Faulty/damaged TCM or ECM.
Improperly adjusted gear shift linkage.
Dirty/contaminated transmission fluid.
Faulty/damaged transmission valve body.

Symptoms of Error P0705

Some vehicles may enter a ‘no-start’ state after P0705 appears, especially if the TRS sends a signal other than 'Park' or 'Neutral.' This can prevent the vehicle from starting, as for safety reasons, the vehicle must be in 'Park' or 'Neutral.' Other symptoms of P0705 include improper gear locking during acceleration or deceleration. It may also be noticeable that the car shifts gears inconsistently or roughly. Of course, the check engine light will also be illuminated on the dashboard.

How to Diagnose DTC P0705?

It is not recommended to troubleshoot code P0705 by yourself, except for basic diagnostic checks such as inspecting wiring or physical sensor damage. You will need a multimeter, an advanced OBDII scanner, and access to the transmission and transmission valve. Below is an overview of the troubleshooting process to familiarize yourself with the main task.

The first step requires two people: one technician checks the voltage and ground at the TRS, while the other shifts gears. Checking for the correct output voltage for each gear position is done using a multimeter.

A similar test is performed by connecting test wires to the TRS instead of checking voltage directly.

Similar tests can be conducted for the variable resistor and TRS pressure range switch systems. The results will help determine faulty wiring, a defective sensor, or serious problems with the ECM/TCM of your vehicle.

If you believe you can handle the diagnosis yourself, be sure to review the TRS specifications and voltage ranges for your vehicle before starting the tests.

How to Avoid Common Mistakes with OBD Code P0705?

Whenever you receive a fault code related to the transmission, first check the transmission fluid level. Dirty or contaminated fluid can cause phantom transmission issues leading to various OBDII codes. Start by checking the fluid before performing unnecessary repairs.

How Serious is the P0705 Error?

In the short term, code P0705 is unlikely to lead to catastrophic consequences, but it requires attention. The worst-case scenario is a no-start condition and the illumination of the check engine light. Gear locking issues are also possible, and some vehicles may limit speed to 40 miles per hour until the problem is resolved.

How to Fix Code P0705?

Experts usually recommend the following solutions to fix code P0705:

Repair/replace broken or shorted TRS wiring (this can be complex but relatively inexpensive).
Replace a faulty TCM (rare, but can be complex and costly).
Replace a faulty ECM (rare, but can be complex and costly).
Replace transmission fluid and filter (recommended regularly throughout the vehicle's lifespan).
Adjust the linkage between the gear shift lever in the transmission and the lever in the cabin (this can be complex but not very costly).

Conclusion

If your vehicle is not stuck in a non-start condition and remains safely drivable, it is best to visit a service center or auto repair shop as soon as possible. If you are curious, you can attempt to fix the issue yourself, but P0700-series codes indicate that this task is better handled by a professional. It requires significant effort and is best left in the hands of specialists.

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OBD P0705 code analysis and solutions

The page presents a in-depth analysis of code P0705 for Opel, Renault, VW (Volkswagen), Ford, Peugeot, Mitsubishi, Skoda, BMW, Citroën, Toyota, Lada, Honda, Kia, and other models to investigate probable causes and solutions related to OBD 2 errors, with main attention on the issue. We provide engineering documentation and methods for diagnostics to identify and find a solution effectively. Our resource is designed to be a comprehensive source of information on OBD 2 errors, providing you with the necessary tools for successful repair and maintenance of your automobile. If during the repair of OBD 2 errors you need to purchase parts, don’t forget to check out Avtopro!