6L90 Transmission Problems & Failure Points

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6l90 transmission problems

In this article, we will be discussing the 6L90 transmission problems. This GM transmission is found in Chevrolet Silverado and GMC Sierra trucks from 2007 and up, as well as Cadillac Escalade SUVs from 2007 and up. The 6l90 has shown to be a reliable transmission, but like all complex mechanical systems, there are common problems that do occur. In this article, we will discuss some of these common problems, as well as the most likely failure points in transmission.

Problems Encountered

  • Clutch Pack Failures 

One of the most common problems with the 6L90 transmission is clutch pack failures. The symptoms of this problem include slipping gears, hard shifts, delayed engagement, and burning smells coming from the transmission. These failures are typically caused by a low fluid level or contamination in the fluid. If you observe any of these symptoms, it is essential to have your transmission checked by a qualified mechanic to stay away from any further damage.

  • Valve Body Issues 

Another common problem with the 6L90 transmission is valve body issues. The valve body controls the flow of fluid and pressure within the transmission, and when it malfunctions, it can cause a variety of issues, such as shifting problems, delayed engagements, and even complete failure of the transmission. If you witness any of these issues, it is vital to have your valve body checked by a qualified mechanic to see if it needs to be replaced or repaired.

  • Solenoid Failures 

The solenoids in the 6L90 transmission control the shifting of gears and manage the flow of fluid through the transmission. When they fail, it can cause shifting issues, delayed engagements, and even complete failure of the transmission. If you see any of these issues, it is crucial to have your solenoids checked by a qualified mechanic to see if they need to be replaced or repaired. It is also important to make sure that your fluid levels are topped off and that there is no contamination in the fluid before having your solenoids repaired or replaced.

  • Torque Converter Failures 

The torque converter in the 6L90 transmits power from the engine to the transmission and is what allows your vehicle to idle without stalling. When it fails, it can cause slipping gears, hard shifts, delayed engagement, burning smells coming from the transmission, and even complete failure of the transmission. If you watch any of these issues, it is necessary to have your torque converter checked by a qualified mechanic as soon as possible to avoid further damage to your transmission.

Conclusion

The GM 6L90 transmission is a reliable unit that can last for many years with proper care and maintenance, but like all complex mechanical systems; there are common problems that do occur from time to time. By being aware of these common problems, you can save yourself time and money in the long run by getting them fixed before they cause major damage.