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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.

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.