What is OBD-II Code P0705 – Transmission Range Sensor A Circuit (PRNDL Input)
As a mechanic, you likely encounter OBD-II codes on a regular basis. These codes provide important information about where to look to find a problem and help you to more quickly identify what needs to be fixed. One such code is P0705, which refers to a transmission range sensor A circuit error. In this article, we’ll discuss what this code means, what you should look for when diagnosing it, and how to repair the issue.
What is OBD-II Code P0705?
OBD-II Code P0705 refers to a problem with the transmission range sensor A circuit, which is also known as the PRNDL input. This circuit is responsible for transmitting information about the position of the gear shifter to the transmission control module (TCM). When the TCM receives inaccurate or incomplete information from the sensor, it may fail to properly control the transmission, causing a variety of problems with shifting, acceleration, and overall performance.
Symptoms of P0705
When P0705 is present, there may be several symptoms that you’ll notice in the vehicle you’re working on. The most common include:
– The gear shift lever may not move or may be stuck in a certain position.
– The engine may stall or hesitate when shifting gears.
– The vehicle may not start at all if the sensor is so badly malfunctioning that it causes the TCM to shut down the engine.
– The Check Engine light and other dash warning lights may be illuminated.
Diagnosing P0705
To diagnose P0705, you’ll need to use a diagnostic scanner or tool that can read OBD-II codes. Once you have the code, you can begin to investigate the possible causes. Here are some steps you can take:
1. Check wiring connections: One common cause of P0705 is a loose or corroded wiring connection between the transmission range sensor and the TCM. Inspect these connections carefully and make sure they are clean, dry, and properly seated.
2. Check the sensor itself: Another potential problem could be the transmission range sensor itself. You can test this component with a multimeter to ensure that it is working properly. If it’s not, you’ll need to replace it.
3. Check the TCM: Sometimes, the TCM itself may be the problem. If you’ve ruled out wiring and sensor issues, you may need to test the TCM or have it professionally serviced.
4. Inspect the shift linkage: In rare cases, the shift linkage itself could be the issue. Check this component thoroughly for any signs of damage or wear that could be affecting its performance.
Repairing P0705
To repair P0705, you’ll need to address the underlying cause of the problem. This could mean replacing a faulty sensor, repairing damaged wiring or connections, or servicing the TCM. Here are some repair steps you can follow:
1. Replace the sensor: If the transmission range sensor is faulty, you’ll need to replace it with a new one. This is often a relatively simple process that involves disconnecting the old sensor and installing the new one in its place.
2. Repair wiring or connections: If you find that a wiring connection is loose or corroded, repair or replace it as needed. Strip and reconnect any loose wires or replace any corroded connectors.
3. Service the TCM: In some cases, the TCM may need to be serviced or replaced. This is a more complex repair that may require professional help.
4. Inspect the shift linkage: If the shift linkage is damaged, you may be able to repair it by replacing any worn or damaged parts.
FAQs
1. Can I still drive my car with a P0705 code?
You may be able to drive the car with the code, but it’s not recommended. If the transmission range sensor is providing inaccurate information to the TCM, it can cause damage to the transmission over time.
2. Is P0705 a serious code?
Yes, it’s a serious code that can affect the performance of the vehicle and even cause transmission damage. It’s important to diagnose and repair the problem as soon as possible.
3. Can I reset the code myself?
Yes, you can reset the code yourself using a diagnostic scanner, but this will not fix the underlying problem causing the code. It’s important to properly diagnose and repair the issue before clearing the code.
4. How much does it cost to repair P0705?
The cost of repairing P0705 will depend on the underlying cause. Replacing a sensor or repairing wiring will be less expensive than servicing or replacing the TCM. Always get an estimate before proceeding with any repairs.
5. How can I prevent P0705 from happening again?
There is no guarantee that P0705 won’t happen again, but maintaining your vehicle’s transmission and replacing parts as needed can reduce the risk of future issues. Keep an eye on the shifting and acceleration of your vehicle and address any unusual symptoms promptly.
Conclusion
OBD-II Code P0705 is a serious issue that requires prompt attention. By understanding what this code means and how to diagnose and repair it, you can help your customers get back on the road safely and with confidence. Remember to take your time diagnosing the problem and to thoroughly test any components before moving on to more complex repairs like TCM servicing. With care and attention to detail, you can help your customers keep their transmissions running smoothly for years to come.
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