How to Fix Transmission Control System MIL Request | 5 Best Ways

The Transmission Control System Malfunction Indicator Lamp (MIL) request is a common issue many vehicle owners face. When the MIL illuminates, it indicates a problem with the transmission control system, which can cause various topics such as rough shifting, poor performance, or even complete transmission failure. We will provide you with a comprehensive guide on How to Fix Transmission Control System MIL Request. 

We will explore common causes behind this issue, discuss possible solutions for resolving it, and offer practical tips to prevent its recurrence in the future. Dealing with this problem promptly and effectively is crucial to ensure the smooth operation of your vehicle.

What Does It Mean When It Says Transmission Control System MIL Request?

The transmission control system MIL request is a warning sign that something may be amiss with your vehicle’s transmission. When this message appears on your dashboard, it indicates that the transmission control system has detected an issue and requests assistance from the malfunction indicator lamp (MIL). Various problems, such as faulty sensors, solenoids, or a malfunctioning transmission control module, can cause it.

Warning Sign

How to Fix Transmission Control System MIL Request

The MIL (Malfunction Indicator Lamp) request warning sign can indicate several potential problems in a vehicle. One common issue is the gear-shifting mechanism, which may experience difficulties changing gears. This can result in hesitation or vibration during gear shifts, making the driving experience rough and uncomfortable. In some cases, the vehicle might stall unexpectedly, causing further inconvenience to the driver. A malfunctioning gear-shifting system can reduce fuel economy, negatively impacting the vehicle’s overall efficiency. It is not uncommon for the check engine light to appear alongside these symptoms, signaling a problem requiring attention from a professional mechanic.

How to Fix Transmission Control System MIL Request- Method Breifing

1-By Adding Automatic Transmission Fluid

Low transmission fluid level is a frequent cause for P0700 and Transmission Control System MIL requests. It is essential to check not only the liquid level but also its quality. 

If the fluid is contaminated or in poor condition, it is necessary to replace the transmission fluid. It is crucial to address any leaks, as they can lead to a drop in fluid level.

2-By Repairing the Damaged Electrical Connection

It is important to thoroughly inspect the connections to address any issues with the power controller and valves in the transmission control system. It can be done by using a multimeter to check the connectors. Any connector’s lack of power signifies a problem with the wire that connects it. To rectify this issue and restore functionality, replacing the faulty wire with a new one is recommended. By repairing the damaged electrical connection, optimal performance of the transmission control system can be ensured.

3-By Fixing the Faulty Transmission Valve Body

A faulty transmission valve body can lead to various issues, including triggering the MIL request and causing the appearance of the P0700 code. Some common symptoms of a damaged valve body include knocking or slamming noises from the vehicle, a noticeable decrease in speed when operating in reverse mode, and slipping when shifting gears. These signs indicate a problem with the transmission valve body, which may require repair or replacement to restore proper functionality and performance to the vehicle’s transmission system.

4-By Fixing the Transmission Solenoids

How to Fix Transmission Control System MIL Request

As a mechanic, I recommend seeking the help of a qualified technician when it comes to fixing transmission solenoids. These intricate components are crucial in a vehicle’s transmission system and require specialized knowledge and skills to handle correctly. Opening up the transmission without the necessary expertise can lead to further damage and potentially worsen the overall condition of the information.
It is always best to leave this checking process to professionals with the necessary experience and tools to ensure a successful repair.

Fixing the Transmission Control Module

Sometimes, the P0700 transmission control system MIL request is caused by a faulty TCM or Transmission Control Module. To determine if the transmission control module is indeed the issue, this is advisable to check for any signs of malfunction. Using an OBD-II scanner, one can quickly scan the code and identify whether the TCM is faulty or not. This approach allows for a more accurate diagnosis and ensures that the appropriate steps can be taken to fix the problem.

How Do I Fix Code P0700?

If you are facing issues with shifting gears, experiencing rough driving, or noticing reduced fuel economy, it is essential to address the P0700 code. When this code appears on the OBD-II scanner, it indicates a problem that needs attention. The first step in resolving this issue is to identify the faulty component responsible for the P0700 code. Once you have identified the problematic part, you can repair or replace it to effectively fix the code P0700 and resolve the associated problems.

How Much Would It Cost to Fix Code P0700?

The cost to fix code P0700 can vary depending on the specific issue. The typical cost ranges from $60 to $200 if the problem lies with a cable connector. However, if the issue is with the transmission control module, you can expect to pay an average of $700 to $900 for its replacement. On the other hand, if the problem lies within the transmission itself, the average repair cost is approximately $400. It’s important to note that these are just general estimates, and actual prices may vary depending on labor charges and location.

Clear a P0700 Fault Code

To clear a P0700 fault code, this is necessary to address the underlying issues that lead to its generation. It means replacing any faulty parts that are responsible for triggering this code. It is essential to consider various factors, such as transmission fluid level and quality, as well as the condition of transmission valve bodies, control modules, and solenoids. By addressing these specific components, one can effectively clear the P0700 fault code and ensure the proper functioning of the transmission system.


How to Fix Transmission Control System MIL Request can be a complex task. By following the steps outlined in this article, you can approach the problem methodically and increase your chances of resolving the issue successfully. Always consult the vehicle’s manual and seek professional help if needed. 

Regular maintenance and inspections are crucial to prevent future transmission control system problems. By being proactive, you can ensure that your vehicle continues to operate smoothly and efficiently. Take action today to address any transmission control system MIL requests problems and enjoy a hassle-free driving experience.


Can a dead or weak battery cause the Transmission Control System MIL Request light to come on?

Yes, a dead or weak battery can sometimes trigger false fault codes in the transmission control system, causing the Transmission Control System MIL Request light to illuminate. It is advisable to check the battery’s health and charge before assuming any major transmission issues.

Why did my Transmission Control System MIL Request light come on after servicing my vehicle?

Sometimes, during routine maintenance or repairs, specific components of your transmission system may have been disconnected or manipulated, causing fault codes and triggering this warning light. It’s best to inform your mechanic about the issue so they can address it prompt

Scroll to Top