GM 6L90 transmission problems

In this brief guide, we are going to provide you with common problems with GM 6L90 transmission and what you can do to rectify these problems before they worsen.

GM 6L90 is an automatic transmission and does not require any manual input to shift gears while driving as most of the cars have automatic transmission. Various sensors and mechatronic systems work in coordination to shift gears automatically. 

Automatic transmissions have a global reputation for quality, reliability and durability. However, there are many problem with automatic transmissions and we’ll tell you why and how you can solve them

What are the common problems with GM 6L90 transmission?

Some of the most common problems with GM 6L90 transmission are:

  • Transmission slippage
  • Difficulty shifting gears
  • Transmission overheating
  • Torque converter malfunction
  • Shift solenoid malfunction

Why is Transmission slippage a problem with GM 6L90 transmissions?

GM 6L90 transmission system is not designed to slip and if you are experiencing slippage then it could cause slow response or further damage to the transmission system. So, it is definitely a sign of a problem with the mechanical components of the transmission.

What are the signs of this problem with the GM 6L90 transmission?

You will be able to hear the gear slip while driving and this would be a good sign if there is slipping. Also, an error code will be displayed if you use a diagnostic tool.

How to solve this GM 6L90 transmission problem?

The solenoids of the two gears might be worn out and need to be replaced. Also, there is a chance that these solenoids might also be broken. Rarely, complete mechanical failure occurs with these transmissions.

Why is Difficulty shifting gears a problem with GM 6L90 transmissions?

You would want a seamless and easy shift even at low throttle input, so if your GM 6L90 transmission is shifting harshly or with difficulty even at low speed then there is definitely a problem.

What are the signs of this problem with the GM 6L90 transmission?

You would immediately notice and sense if the GM 6L90 transmission is shifting with difficulty from one gear to another as this is one of most important issues with GM transmissions.

How to solve this GM 6L90  transmission problem?

Firstly try replacing the transmission pressure sensor, if that doesn’t work then check for an oil leak in the servo assembly of the particular gear. These are primarily two fixes for this problem.

Why is Transmission overheating a problem with GM 6L90  transmissions?

Because GM 6L90 transmission mechanical components tend to get damaged, worn, and malfunction under high heat levels. This results in lower than the acceptable performance from the vehicle and high fuel consumption as well as lowering the life of the gearbox.

What are the signs of this problem with the GM 6L90 transmission?

A few common signs are slow response while accelerating and not getting the desired drive when needed. Also, you could see some sort of malfunction sign on the dashboard.

How to solve this GM 6L90  transmission problem?

Check the transmission oil and its level. If it is too low then fill the required amount of oil in the transmission. If it is too dirty, then drain the entire oil from the transmission and fill it again.

Why is Torque converter malfunction a problem with GM 6L90 transmissions?

If your torque converter or if you are not getting the desired response when you release the brake and press the throttle pedal then you are most definitely experiencing torque converter engagement or disengagement problems.

What are the signs of this problem with the GM 6L90 transmission?

Firstly you would be unable to stop the car when releasing the throttle pedal for disengagement problem and secondly for engagement from even if you press too much throttle the car will not move forward.

How to solve this GM 6L90 transmission problem?

If the clutch of the torque converter is worn out then you need to replace it or else the solenoid might be broken which also might need replacing. In the worst case the entire assembly needs to be replaced if the state of the torque converter is beyond repair.

Why is Shift solenoid malfunction a problem with GM 6L90 transmissions?

Shift solenoid malfunction means there is a problem with the gear shifting. A GM 6L90 transmission changes gear by directing pressurized transmission fluid to move clutches and bands around. The computer controls all of this with little spring-loaded devices called solenoids.

What are the signs of this problem with the GM 6L90 transmission?

P0750 is the code that will be shown if there is a shift solenoid malfunction with the GM 6L90 transmissions. This is a generic code which you will get using OBD-II for your transmission.

How to solve this GM 6L90 transmission problem?

Some common solutions are changing the transmission fluid and filter or replacing faulty solenoids. Also you can repair or replace a faulty transmission pump.

How to precisely diagnose these common problems in GM 6L90 transmission?

To properly diagnose these problems, you need a scan tool to read these codes from the Transmission Control Unit. Firstly, If a GM 6L90 transmission is malfunctioning, it immediately informs the driver with an error message on the screen.

How to prevent getting these problems in the first place?

Regularly changing your gearbox oil and other lubricants may save you a lot of trouble and money in the future. Although many experts suggest different number miles for servicing, your car manual will give you a proper recommendation when you should change it.

FAQs: GM 6L90 transmission problems

How long will a 6L90 transmission last?

The GM 6L90 transmission is validated to achieve 200,000 miles of operation in typical applications. But this mileage majorly depends on the maintenance schedule that is followed. Regularly changing the transmission oil also affects this number.

How do I reset my 6L90 transmission?

The procedure to reset the transmission is as follows:

Keep the engine at idle, shift from neutral to reverse and leave the shift lever in reverse for 5 seconds. After five seconds, shift back to neutral position and leave the shift lever in NEUTRAL for five seconds. Perform this procedure ten times (N-R N-R N-R…).

Conclusion

In this brief guide, we have provided you with common problems with GM 6L90 transmission and what you can do to rectify these problems before they worsen.

If you have any questions or comments please let us know.

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