Chevrolet and its cousin GMC are experiencing problems with some of their heavy-duty full-size pickup trucks, and there’s currently no solution. According to February 2026 General Motors service bulletin PIT6467A, affected models are 2025 and 2026 Chevrolet Silverado 3500 HD and GMC Sierra 3500 HD trucks equipped with the 6.6-liter L8T V8 gasoline engine. The announcement stated, “The truck is out of fuel, and the fuel gauge shows there is still fuel in the tank.” “The fuel gauge defaults to empty, but there is still fuel in the rear tank.” The announcement also states that the SES MIL light can be illuminated without affecting drivability. It lists one possible cause as, “The cause of this may be that the rear tank is not transferring fuel to the front tank.”
This issue applies specifically to all chassis cab versions of these heavy-duty trucks equipped with a 6.6-liter V8 engine, which come standard with dual fuel tanks, designated RPO code N2N. The trucks have fuel tanks located at the front and rear with a total fuel capacity of 63.5 gallons. Even if there is enough fuel in the rear tank, the truck may stall when the fuel gauge reads empty.
This isn’t a new problem for the Chevrolet Silverado 3500 HD and GMC Sierra 3500 HD trucks, which are built at GM’s historic Flint, Michigan, assembly plant. A similar issue plagued these trucks back in 2024, but at the time it affected those packing the 6.6-liter Duramax L5P V8 turbodiesel.
Read more: The 5 worst car trends we’ve ever seen
How will GM handle these Chevy trucks running out of gas prematurely?
Front 3/4 view of Chevrolet Silverado 3500 HD chassis cab dump truck – Althom/Getty Images
The answer to this burning question is – nothing can be solved immediately. The GM service bulletin mentioned above provides specific instructions for mechanics looking for a quick solution. It states, “Do not replace any parts at this time. Engineering is currently investigating. Once a decision is made, the PI (Preliminary Information) will be updated or replaced with a TSB (Technical Service Bulletin).” In other words, GM doesn’t really know why this is happening, so there is currently no solution. It will take some time for GM engineers to analyze exactly what causes the fuel gauge to read empty when there is still gasoline in one of the tanks, and why these trucks stop running even when they have enough fuel to keep moving.
Affected Chevrolet Silverado 3500 HD and GMC Sierra 3500 HD trucks, some of which are more reliable than others, may be closely monitored and their fuel tanks kept close to full until the source of the problem is identified. The cause could be defective parts, assembly defects, a combination of both—or something else entirely.
Want to stay up to date on the latest tech and automotive trends? Sign up for our free newsletter to get the latest headlines, expert guidance and how-to tips, one email at a time. You can also add us as your preferred search source on Google.
Read the original article on SlashGear.