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What GM trucks are having transmission problems?

Several General Motors (GM) truck models have been reported to have transmission problems, leading to concerns among owners and the need for potential recalls or repairs. This article will provide a detailed overview of the specific GM trucks affected and the nature of the transmission issues.


Affected GM Truck Models


The GM truck models that have been experiencing transmission problems include the Chevrolet Silverado and GMC Sierra, particularly the 2014-2018 model years. These full-size pickup trucks are among GM's most popular and profitable vehicles, making the transmission issues a significant concern for the automaker.


Transmission Problems Reported


The primary transmission issues reported by owners of the affected GM trucks include:



  • Sudden loss of power or unexpected shifting while driving

  • Delayed or erratic gear changes, especially when accelerating

  • Transmission fluid leaks

  • Premature wear and failure of transmission components


These problems can be not only inconvenient but also potentially dangerous, as they can affect the vehicle's drivability and control.


Potential Causes and GM's Response


The transmission issues in the affected GM trucks are believed to be related to the 8L90 and 8L45 eight-speed automatic transmissions used in these models. GM has acknowledged the problems and has issued technical service bulletins (TSBs) to address them, including software updates and hardware replacements in some cases.


However, some owners have reported that the fixes provided by GM have not fully resolved the issues, leading to ongoing problems and frustration. The automaker is currently facing several class-action lawsuits related to the transmission problems in its trucks.


Recommendations for Affected Owners


If you own a GM truck that is experiencing transmission issues, it is recommended to take the following steps:



  • Contact your local GM dealership and report the problem, requesting a repair or replacement under warranty if applicable.

  • Document any issues, including dates, symptoms, and any previous repair attempts, as this information may be useful if pursuing a legal claim or seeking further assistance from GM.

  • Consider joining any class-action lawsuits or consumer advocacy groups related to the GM truck transmission problems, as this can help strengthen the case for a comprehensive recall or settlement.


By taking these actions, affected GM truck owners can work to hold the automaker accountable and ensure their vehicles are repaired or replaced as needed.

What year of Chevy Silverado to stay away from?


2011 and 2014 Models
Both the 2011 and 2014 model years had several issues, but the 2014 Chevy Silverado 1500 is the worst model year. Transmission failures, engine problems, cooling issues, stalling, and a noisy engine plague both model years, but the 2014 earned far more complaints from owners.



What GMC trucks have transmission problems?


Chevy Silverado and GMC Sierra owners, including those relying on their trucks for daily work, have reported widespread transmission problems, including shuddering, slipping gears, and jerking during acceleration or towing.



Has GM fixed the 8 speed transmission problems?


The GM 8-speed automatic transmission from those models years has been a black-eye for the company with numerous complaints, recalls and TSBs to try to fix the numerous issues. GM has since redone the transmission completely and even moved forward with a new 10-speed transmission to leave that issue behind them.



What year did GM have bad transmissions?


The affected vehicles include Chevrolet Silverado (2015-2019); Chevrolet Colorado (2017-2019); the Chevrolet Corvette (2015-2019); the Chevrolet Camaro (2016-2019); the Cadillac Escalade and Escalade ESV (2015-2019); the Cadillac ATS, ATS-V, CTS, CT6, and CTS-V (2016-2019); the GMC Sierra, Yukon, and Yukon XL, and ...


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.