Mitsubishi Outlander Transmission Service Required: Causes & Fixes

If you are getting the Transmission Service Required on your Mitsubishi Outlander, the first step to fixing this issue is to run diagnostics to confirm the stored codes.

This will help you identify the main cause of the error, as many things may be responsible. Causes could range from battery issues, which may affect the power of the Transmission Control Modules (TCM), damaged sensors, glitches, software issues, and more that could affect the transmission functioning.

While you may not observe noticeable drivability flaws when this message pops up, we recommend immediate actions to fix its root cause.

What is Mitsubishi Outlander Transmission Service Required?

The Mitsubishi Outlander Transmission Service Required warning hints at problems with the transmission. It is common in vehicles with a CVT or Twin Clutch Sport Shift.

While the cause of the error message is not easy to identify, we have identified low battery voltage as the primary cause. You want to inspect the battery voltage and check for corrosion on the terminals.

Certain sensors or modules may malfunction or fail to perform under low and unpredictable voltage. In this case, we recommend you keep an eye on the Transmission Control module and the transmission range Sensor.

If the transmission range sensor is damaged, you should have the P0705 error code stored on the onboard system. Inspect the sensor, and check that it gets the required working voltage.

Also, other causes can be traced to transmission service required include overheating, dirty fluids, wiring problems, and software glitches.

Symptoms of Mitsubishi Outlander Transmission Service Required

The obvious symptom is the error message on your cluster display. Other symptoms that relate to the error message are tied to the functioning of the transmission. It is important to note that you may not notice any obvious symptoms, especially early when the code appears.

You should pay attention to the following:

  • Transmission slipping, which are obvious signs of malfunction of the transmission system.
  • Any strange noise coming from the transmission will indicate a fault.
  • Stored error codes including  P0705: Transmission range Sensor circuit Malfunction, P1740: Torque Converter clutch (TCC) Malfunction, and other transmission-related codes.

Causes of Mitsubishi Outlander Transmission Service Required Warning

Understanding the root causes of the “Mitsubishi Outlander Transmission Service Required” warning is crucial in implementing the appropriate solutions. Here are some common causes and their corresponding fixes or remedies:

Transmission Control Module (TCM) Issues

TCM plays an important role in the operation of the automatic transmission system. If damaged, it is likely to trigger the error message. Most times, low voltage, weather conditions, and heat may damage the TCM. Physically inspect the module.

Overheating of the Transmission

Another possible cause of the warning message is overheating of the transmission system. This can be caused when you use the wrong transmission fluid or when the fluid runs low. Check the condition and type of fluid used.

Faulty Transmission Solenoids

Transmission solenoids control how much fluid flows through the transmission. Solenoids are electro-hydraulic switches that send fluid to different transmission parts, allowing for smooth gear changes and efficient operation.

When solenoids don’t work right, it can be hard to change gears. Using diagnostic tools, a professional mechanic can figure out which solenoid isn’t working and replace it with a new one that does.

Mechanical Damage

Mechanical damage in a vehicle means its mechanical components have been tampered with. When mechanical problems are inside the transmission, like worn clutch plates or gears, it may be necessary to do a full check and possibly rebuild or replace the transmission. 

Fixes for the Mitsubishi Outlander Transmission Service Required warning message

Fixing the transmission service required message will require you to diagnose the warning error’s cause properly. From our experience, a low or bad battery has been discovered to cause the warning message. Here is what we recommend you do if you are getting this message

Perform a battery test

If the battery is bad, you may experience difficulty in starting the car, and the warning message may be triggered. In this case, run a diagnostic scan on the vehicle. If there are no errors relating to the transmission system, the likely cause is the battery. Try cleaning the corrosion on the battery terminal or changing the bad battery to fix it.

Perform a transmission fluid flush

If you use an automatic transmission and have not had the fluid changed after 30,000 miles, you should have a fluid flush. Fluid flush is also useful when there is contamination of fluid in the car. For instance, if you get the code after using the wrong fluid, you should have a flush and replace it with the right fluid. 

Perform a software update

Sometimes your vehicle may have a software issue and trigger unrelated warning messages. Make sure it runs on the currently available software. Check with a professional to ensure your car runs on current updated software.

Check Transmission fluid level

One common cause of the warning message is low or degraded fluid. Ensure you have your transmission fluid changed at regular intervals. Also, check the condition of the transmission fluid. If it looks dirty, you may need to change it even if it hasn’t clocked the mileage yet.

Scan for error code

Using an OBD ii scan tool, scan for stored codes in the onboard system. This method lets you properly identify the warning message’s main cause. You should keep an eye out for codes P1740 and P0705.

Seek professional help

If you are still trying to identify and fix this error, visit a professional mechanic or Mitsubishi dealer to help resolve the issue. Their expertise and advanced technology will save you time and properly identify the cause.


The Mitsubishi Outlander “Transmission Service Required” warning is a crucial reminder for owners to address potential transmission issues promptly. Ignoring this warning can lead to more significant problems and expensive repairs in the future. If you encounter this warning or experience any accompanying symptoms, seeking professional assistance from a qualified mechanic or authorized dealership is advisable.

  • Edmond Davis

    I'm Edmond Davis, an automotive expert with years of experience in vehicle repair, performance, and safety. I graduated from the University of Michigan with a degree in Automotive Engineering and have worked with major companies like Ford, GM, and Chrysler. I'm a trusted source of information for anyone looking to learn more about cars or improve their driving experience.

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