Transmission Control System Mil Request? [Fixed]

Transmission of your car is very important to be good for the better health of your engine. Transmission is like the controller of your engine power. In other words, It controls your engine output according to your requirement. That keeps reviewing your RPM at wheels concerning the engine RPM. And you can achieve your required power in very less work done by your engine. Generally, it is used in automobiles because their engine used to work on very high Rpm. That is harmful to your starting, stopping, and if you want to travel at medium or low speed.

You are using the transmission in the car to get variable speeds at different engine RPMs. To control it there is the control module that handles all the variations of speed from your engine to the wheels. Also, it controls the direction of your car forward or backward. So if there is a problem with your transmission control module that indicator is named as mil request. So we are here with the transmission control system mil request article.

What Does Transmission Control System Mil Request?

It indicates that there is a malfunction in the controller module of your transmission system, preventing your car from changing gears properly, it is more dangerous for yourself and for others who are on the roads. So, every car has a transmission control module and it monitors the sensors and actuators that using in changing gears.

They measure the behavior and communicate with the engine control module then the engine control module tells if there is any kind of issues with the transmission control module. And that is shown in the code of error is P0700.

How Do You Check Your Transmission Control System Mil Request?

If your car has a problem with your transmission system and you searching how would you find that you have a faulty transmission control module and where they are showing the what kind of problem in it.

1. Check Light Engine

Check light Engine is very common it illuminates your dashboard then there is various kind of fault that is synced with the check engine light. But when your check engine light is illuminating your dashboard there is any roughness and problem that you felt while shifting gears. That means you may fault your transmission control.

It also illuminates when you have problems in the poor fuel economy, failing oxygen sensor, mass airflow sensor,  fuel cap left loose, catalytic converter failure, issues in spark plug and ignition coil, burned spark plug wires, issues with an aftermarket alarm, and so on.

2. Unpredictable Shifting

The transmission control module is necessary for automatic Transmission because it relies on the feedback of the transmission control module to shift properly. If there is any erratic noise while shifting gear and unintended shifting occurs. Then your transmission control module is faulty. You will go to the mechanic or an autobody shop to fix it.

3. Problem Shifting In Higher Gears

When you keep your throttle increasing your gears are shifting simultaneously because each gear has its limited speed. So if your car didn’t change the gear and engine rpm keep increasing with your increasing throttle. Then you have trouble with your transmission control module.

4. Problem In Downshifting

This problem is the same as the shifting up problem but it is oppositely. When you are cruising at high speed and after that, you are going to slow down then your gear must shift to the lower. Like when doing uphill and slows down for some reason and after that, you required the high torque at low rpm, and if your gear does not shift down then it is harmful to your car.

5. Stuck In the Same Gear

This is also the same but in that, your car neither shifts up nor shifts down unless you have a dedicated manually up and downshift into your automatic transmission system then it is very harmful to your car and also for clutch and your engine health.

6. Delayed Shifting

when noticing that your car shifts gear every time but there is some lag short time every time gear shifts up or down. In that case, your car does not change the gear at the proper time to get a better combination of engine rpm to your wheel. That is also called the communication gap and your transmission control module tends towards more damage.

7. Poor Fuel Economy

So is not getting the amount fuel economy in the car as the previous. Then this also the symptoms of a bad transmission control module. You have to go to the mechanic or to an auto body shop to fix it.

How To Fix Transmission Control System Mil Request?

To fix the Transmission Control System Mil Request you to require the OBD-2 tool that helps you to diagnose every problem in your car and just see the error code. If it is P0700 then there is a fault in your transmission control module. In that case, you must require the mechanic and nearby auto part shop to fix it but you can do some prior steps to solve it.

  1. Clear the OBD-2 Codes (if you know you can replace from the new one)
  2. Check Transmission fluid level
  3. Take the car to the maintenance shop for diagnostic
  4. Transmission fluid change
  5. Wire or sensor replacement
  6. TCM (Transmission control module) replacement
  7. Transmission replacement

Is It Easy To Replace It?

Replacing the Transmission control module is a kind of laborious work. So, it costs you around 300USD may be more or less, depending upon the placement of the transmission control module. In some old cars, it is placed at the area of the engine and that was much easier to replace.


At last, I hope that after reading the whole article you get to know about every reason behind getting transmission control system mil request, and how to fix it.

These are the main cause that generally harms your car suspension system. And that is only controlled by the proper maintenance and scheduled services. it also helps you more to maintain the vehicle properly and you also get the proper assistance from there.

These situations are very common these days and day by day the consumption is increasing exponentially and there is the possibility of manufacturing defects, so it is mandatory to always be punctual with the service logs of vehicles. This helps you to keep far from the unusual situations because it is too low cost than repairing any part or replacement of that part and that makes you a good consumer.

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