How bad are the GM 8 speed transmission problems?
The General Motors (GM) 8-speed transmission, known as the 8L90 and 8L45, has been a topic of concern for many vehicle owners. While these transmissions were designed to improve fuel efficiency and performance, they have been plagued by a range of issues that have left drivers frustrated. In this article, we’ll explore the extent of these problems, their impact on vehicle performance, and what you can do if you’re experiencing them.
Common Problems with GM 8-Speed Transmissions
Drivers and mechanics alike have reported several recurring issues with GM’s 8-speed transmissions. These problems can significantly affect the driving experience and, in some cases, lead to costly repairs. Here are the most common complaints:
- Harsh Shifting: Many drivers have experienced rough or jerky shifting, especially when accelerating or decelerating. This issue can make driving uncomfortable and may indicate internal transmission problems.
- Shuddering or Vibrations: A frequent complaint is a noticeable shudder or vibration when the vehicle is in motion, particularly at lower speeds. This is often linked to issues with the torque converter.
- Delayed Engagement: Some vehicles exhibit a delay when shifting into gear, such as from park to drive or reverse. This can be both inconvenient and dangerous in certain situations.
- Transmission Slipping: Drivers have reported instances where the transmission slips out of gear, leading to a loss of power and control.
- Fluid Contamination: Problems with the transmission fluid, such as contamination or improper levels, have also been noted. This can exacerbate other transmission issues.
What Causes These Problems?
The root causes of these issues are varied, but several factors have been identified:
- Design Flaws: Some experts believe that the 8-speed transmission suffers from inherent design flaws, particularly in the torque converter and hydraulic systems.
- Software Issues: Transmission control module (TCM) software glitches can lead to improper shifting and other performance problems.
- Manufacturing Defects: In some cases, manufacturing defects in components like the torque converter have been linked to transmission failures.
Impact on Vehicle Owners
The problems with GM’s 8-speed transmissions have led to widespread dissatisfaction among vehicle owners. Many have reported frequent trips to the repair shop, high repair costs, and even complete transmission replacements. Additionally, these issues have sparked multiple lawsuits against GM, with plaintiffs alleging that the company failed to address known defects.
What Can You Do If You’re Experiencing These Issues?
If you’re dealing with GM 8-speed transmission problems, here are some steps you can take:
- Check for Recalls: Visit the National Highway Traffic Safety Administration (NHTSA) website to see if your vehicle is subject to any recalls related to the transmission.
- Consult a Professional Mechanic: Bring your vehicle to a trusted auto repair shop, like Kevin’s Autos, for a thorough diagnosis. A professional mechanic can identify the root cause of the issue and recommend the best course of action.
- Consider a Warranty Claim: If your vehicle is still under warranty, contact your dealership to see if the repairs are covered.
- Document the Problem: Keep detailed records of the symptoms, repair attempts, and any communication with GM or your dealership. This information can be valuable if you decide to join a class-action lawsuit or pursue other legal remedies.
Final Thoughts
While GM’s 8-speed transmissions have been a source of frustration for many drivers, understanding the common issues and taking proactive steps can help mitigate the impact. If you’re experiencing transmission problems, don’t hesitate to seek professional assistance. At Kevin’s Autos, we have years of experience diagnosing and repairing transmission issues, and we’re here to help you get back on the road with confidence.
Frequently Asked Questions
What is the lawsuit against GMC 8 speed transmission?
The lawsuit claims these vehicles suffer from significant transmission issues, including shuddering and shaking in higher gears and hesitation and lurching in lower gears, even after attempted repairs. Additionally, GM is accused of instructing dealers to reassure customers that these harsh shifts were “normal.”
What year are GM 8 speed transmission problems?
The 8 speed was introduced in the 2014 Silverado. The problem was with the ATF GM used, it was hygroscopic. GM released a TSB to exchange the ATF to a new Mobil 1 blue label ATF that corrected this issue for most 8 speeds in 2019.
Is the 8-speed transmission reliability?
Although this is reliable out the box, it does not offer good longevity or lockup quality, resulting in a very soft lockup that is known to flare during application. Heavier vehicles as well as vehicles with lots of torque are likely to experience ZF 8-Speed torque converter issues.
Who makes GM 8 speed transmission?
GM
Designed and built by GM, the 8L90 automatic transmission offers increased efficiency and lighter weight compared to the previous 6L90 Hydra-Matic six speed transmissions.
How long do GM 8 speed transmissions last?
Typical GM transmissions live about 150-180K miles before they need a rebuild.
Is the 8 speed transmission reliability?
Although this is reliable out the box, it does not offer good longevity or lockup quality, resulting in a very soft lockup that is known to flare during application. Heavier vehicles as well as vehicles with lots of torque are likely to experience ZF 8-Speed torque converter issues.
How to join GM 8-Speed Transmission class action lawsuit?
Models. This information is Ty speically outlined in the lawsuit's. Details you can find this information through legal notices or the law firm's website handling.
What years did GMC have transmission problems?
The 2014-2019 models equipped with the 6L80 and 8L90 transmissions have received a significant number of complaints, with the 2015 and 2016 model years being particularly problematic.
What is the best 8 speed automatic transmission?
The ZF 8 Speed has developed a reputation for being one of the best automatic transmission systems on the market today. Made by German supplier ZF, it has a long, decorated history of success within the automotive industry in both passenger and commercial vehicles.
Is the GM 8L90 a good transmission?
The 8l90 is a solid transmission. Unfortunately, most of the issues are based around the torque converter. The torque converter isn't the transmission. But even then, the issue isn't really the torque converter. It's a combination of incorrect fluid and tuning.
