P0715 code — how to fix error fast

One of the main things that could ruin your day behind the wheel is getting a code like P0715 diagnosed via a scanner tool. We know how much it can confuse you as a driver or even lead to insecurities as to whether you should be driving with the code or not.

Don’t worry – we’ve prepared a complete guide on the P0715 code meaning, reasons why it appears, and its consequences on your vehicle’s mechanical parts. We’ll also be taking a tour of the main ways to fix and prevent the issue, regardless if these are related to things you can do yourself or steps to entrust a professional mechanic with.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P0715 code mean?

The P0715 code is related to the input/turbine speed sensor circuit in the transmission system. This sensor measures the speed of the input shaft and sends this information to the engine control module (ECM). The ECM uses this information to control the transmission and ensure that it’s shifting properly. If the ECM detects that the input/turbine speed sensor circuit is malfunctioning, it will trigger the P0715 code.

To put it plainly the sensor measures the RPM generated by the input shaft of your car’s transmission, so it’s obvious that this sensor is one of the most important things for proper operation of your transmission.

What causes the P0715 code?

Many things could go wrong and manifest through the error code P0715 after a diagnostic scan. While the code P0715 seems to have a pretty clear explanation, there are other things that may be behind the code’s triggering. These include the following faulty parts:

Bad input speed sensor

The input speed sensor itself could malfunction and cause the code P0715 to appear after a scan. If that’s not bad enough on its own, there are other components like wiring harnesses that could cause the sensor to go bad and behave differently.

Wiring or connection issues with the sensor’s circuit

If there’s a short circuit or the wiring connections of the sensor get damaged, you won’t be able to get proper feedback from it. To put it precisely, the sensor won’t be able to submit proper information to the ECM, and that only leads to more issues.

Problems with the TCM

The transmission control module is the main part that controls the performance of the transmission system in your car. It also receives the information from the ECM and the input speed sensor, so if the TCM goes bad, the computer may inadequately misplace it for a problem with the sensor.

However, we have to point out that this is a rare occurrence and it’s worth looking at other options first.

Which car models does the P0715 code affect the most?

While almost every car should be identically exposed to the code P0715, there are certain car models that have a higher incidence of the P0715 code than others. This code is often associated with vehicles that use the 4F27E transmission, which is manufactured by Ford and used in a number of different vehicles, such as:

• Ford Focus: This car has an issue with the 4F27E transmission which has a design flaw that can cause debris to accumulate in the valve body, therefore interfering with the input speed sensor’s ability to accurately detect the speed of the input shaft.
• Ford Fiesta: For the same reasons as the Focus, the Fiesta is exposed to transmission issues on models equipped with a 4F27E shifter.
• Mazda 5: This car has a manufactured flaw related to the transmission which makes it more prone to the code 4F27E than others.

How to diagnose the P0715 code

There are many things that could cause the code P0715 to trigger, so it takes using several different approaches to properly diagnose the code. Here’s what you can do to uncover the reason behind the code conveniently:

Use an OBD2 scanner tool

The first step in diagnosing any check engine light is to connect an OBD-II scanner to the vehicle’s diagnostic port and read the codes that are stored in the system. This will reveal the P0715 code (and any other codes that may be present) and give the mechanic a starting point for further diagnosis.

Checking the input speed sensor

If no obvious issues are found during the inspection, it’s possible to perform some tests on the input speed sensor to determine whether it is functioning properly. This could involve using a multimeter to measure voltage or resistance across certain terminals of the sensor.

Checking the wiring and connections

f the input speed sensor appears to be functioning correctly, the mechanic may turn their attention to the wiring and connectors associated with the sensor. They may use a wiring diagram to trace the circuit and check for any breaks or shorts in the wiring or corrosion or damage in the connectors.

Testing the TCM

If everything else fails, it’s possible that there may be an issue with the transmission control module (TCM) itself. The mechanic may perform some tests on the TCM or use specialized diagnostic equipment to determine whether it is sending and receiving signals correctly.

How to fix the P0715 code

Fixing the code P0715 isn’t easy but it’s still possible after finding the exact root cause of the problem. Once the diagnostic phase is done, you can apply one of the following fixes:

Replacing the input speed sensor

If the input speed sensor is found to be faulty or damaged, the mechanic will likely recommend replacing it with a new one. This is a relatively simple repair that involves removing the old sensor and installing a new one in its place.

Repairing the wiring and connections

If the issue is found to be with the wiring or connectors associated with the input speed sensor, the mechanic may repair or replace these components as needed. This could involve splicing in new sections of wire, repairing corroded connections, or replacing damaged connectors.

Inspecting the TCM

In some cases, the issue may be with the transmission control module (TCM) itself. If this is the case, the mechanic may recommend replacing the TCM with a new one. This is a more involved repair that can be costly, so it’s typically only done if all other options have been exhausted.

How to prevent the P0715 code

In some cases, input speed sensor issues may be caused by other problems within the transmission, such as clogged fluid passages or worn-out clutch plates. In these cases, performing regular transmission maintenance can help prevent further issues from occurring in the future. Here are some other ways you can prevent the code from re-appearing:

• Have your transmission fluid changed regularly
• Check the transmission fluid level regularly
• Have your transmission system inspected during routine maintenance
• Avoid towing heavy loads or driving in extreme conditions

By following these preventative measures, you can reduce the risk of the P0715 code appearing and prolong the life of your transmission system.

Our take

In the end, the code P0715 is not as hard of a fix as it seems since all you need is an affordable OBD2 scanner to diagnose the code. However, finding the exact solution is the hard part and it makes sense you’ll need some professional advice to do it properly.

That’s why our team wants you to have all the information and pieces of advice from our automotive experts readily available for easy application, and this guide hopefully delivers it.