*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Engine and engine cooling
See attached document for complaint.
Jul 14, 2026Engine and engine cooling › Exhaust system
The contact owns a 2019 Chevrolet Silverado. The contact stated that on several occasions at various speeds, the contact observed an exhaust odor coming into the cabin of the vehicle from the vents. The vehicle was taken to two dealers where the failure was not able to be replicated. The manufacturer was notified of the failure. The failure mileage was approximately 60,000.
Nov 8, 2023 · 60,000 milesPower train
Very hard downshift of transmission caused rear wheels to break traction on icy road. Vehicle slid sideways across the road nearly going over the edge of a steep downgrade.
Feb 15, 2026Engine
Def pump and heater module had burned terminals. This caused failure to the def pump and heater module. This was the second instance of this happening on this truck in roughly 40,000 miles. Burned terminals can start electrical fires that are a danger to occupants and others in the vicinity. Failure of this system forces a drop in speed after so many miles that make you a danger on the road.
Jan 23, 2026Electrical system
There is a common and very dangerous electrical wire routing problem on my vehicle, along with 3 dozen others and my dads (separate but same truck) i confirmed with (FB group for owners of 17-19 L5P GMC diesel trucks) where the alternator positive wire from the alternator to the battery is run right along and across a rather sharp part of molding from the air intake tube. This routing location and rough intake plastic molding rubs through the alternator wire creating a possible electrical short/ corrosion problems that can lead to battery and electrical system compromise, as well as fire risk! A short-circuit condition can cause damage to engine components and, in rare cases, start a fire…
Oct 28, 2025Fuel/propulsion system
Driving at hiway speed and towing a 40' travel trailer the transmission failed and put my family in grave danger. GM is aware of this issue as they have issued a service bulletin due to an engineering flaw.... ( transfer case input and out put shaft failure) This needs to be a recall before someone is killed or injured ( wheels locking up at hiway speeds)
Sep 30, 2025Air bagsCrash1 injury
The contact, who owns a 2019 Chevrolet Silverado 3500, reported an incident that occurred while driving at approximately 35 MPH. A semi-truck, backing out of a warehouse across three lanes, collided with the driver's side of the contact's vehicle, causing damage to the entire left side. Despite the impact, no airbags were deployed. The collision exacerbated the contact's existing lower back and spine injuries, necessitating medical attention and ongoing physical therapy. A police report was filed following the incident. Although the vehicle was not towed, it was taken to a collision center, which determined that repairs could be made as the frame was not damaged. The contact consulted with…
Aug 7, 2025 · 63,000 milesService brakes
1st incident: When driving the vehicle dashboard shut off, no indicators working such as speedometer, gauges etc and brakes were not working, luckily I was in a 60 miles an hour zone so I had to just let the vehicle come to a gravity stop. To turn off the engine and start it back up again. 2nd incident: when driving the dash lights turned off and on like flickering on and off and all the gauges mentioned above did not work, and brakes did not work. This is very scary! All power in the truck is lost while driving and braking issue!
Jul 31, 2025
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.