General Motors Released Truck Software Update V661.20
The over-the-air update adds audio and display performance improvements to Chevrolet and GMC pickup truck models.
Updated on Oct. 10, 2026 in Trucks
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General Motors has released software update V661.20 for its current-generation Chevrolet Silverado and GMC Sierra light-duty pickups. The update, which became available this October, addresses performance issues within the vehicle systems.
Why it matters
Regular over-the-air updates allow automakers to enhance vehicle performance and resolve software bugs without requiring owners to visit a dealership for service. This capability extends the functionality of infotainment systems long after the vehicle leaves the factory floor.
The V661.20 update requires approximately 15 minutes to install while the vehicle is parked and powered off. This patch applies to compatible light-duty pickups produced through the 2026 model year.
The players
General Motors
General Motors is a multinational automotive manufacturer that produces brands including Chevrolet and GMC.
GMC Sierra
The GMC Sierra is a line of light-duty and heavy-duty pickup trucks manufactured by General Motors.
Chevrolet Silverado
The Chevrolet Silverado is a popular full-size pickup truck series produced by General Motors.
The details
The V661.20 update introduces performance improvements to the audio system, resulting in more noticeable bass output. Additionally, the software includes fixes intended to stabilize and improve the responsiveness of the truck's center display unit.
Timeline
October 2026: General Motors released the V661.20 software update.
Roadmap
The over-the-air software update distribution model has shifted the auto industry from a hardware-centric maintenance cycle to a continuous improvement paradigm. This allows manufacturers like General Motors to refine vehicle capabilities throughout the ownership lifecycle.
Owners can apply the update by parking their vehicle and keeping it switched off for the 15-minute installation process. Following the update, drivers should notice improved audio bass performance and a more stable center display interface.
The takeaway
Drivers should ensure their vehicle connectivity remains active to receive future performance enhancements automatically. Keeping software current helps maintain the functionality and audio quality of the truck's infotainment system.
Further reading
For more on current developments in the segment, visit the Trucks section.
Source note: This article includes information reported by GM Authority.
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Do you generally trust that over-the-air software updates will improve your vehicle's performance?
