This page covers 6 recalls and 14 owner complaints for the 2018 GMC Sierra 3500.
Complaints about the 2018 GMC Sierra 3500 center on steering, brakes, and exterior lighting. On the brake side, owners report warning lights, including ABS and stability control indicators, illuminating unexpectedly while driving, sometimes accompanied by a noticeable change in brake feel or delayed stopping response when pressing the pedal. A separate pattern involves multiple dashboard warning lights coming on at once, prompting owners to pull over and restart the vehicle. Steering complaints round out the top reported systems, though the narratives don't converge on a single specific symptom. Two owners report exterior lighting issues. One isolated report describes the rear window shattering while the vehicle was parked with the rear defrost running, with no warning light present beforehand.
14
Total Complaints
By System
The 2018 GMC Sierra 3500 has 6 recalls, the most serious involving fire risks from the optional engine-block heater cord, which can short-circuit and ignite, and from a fuel tank defect that can cause the front tank to overfill, expand, and contact the driveshaft, puncturing the tank.
On the fuel system side, trucks with the dual tank option also face a separate issue where the rear tank can collapse and cut off fuel transfer to the front, causing the engine to stall while driving. Crew Cab models have a curtain airbag recall where the inflator's end cap can detach or the inflator sidewall can rupture, sending metal fragments into the cabin during deployment. The front seatbelt retractors on certain trucks were built with the wrong internal component and may not hold properly in a crash. Note that the engine-block heater fire risk applies only to trucks equipped with the Duramax 6.6-liter diesel and the optional block heater cord, while the fuel overfill concern applies to gasoline-engine models with dual tanks.
At a glance
What can fail
The roof-rail air bag inflator's end cap may come loose or the inflator itself may crack, affecting the left or right side of the vehicle.
What the fix does
Dealers will replace both left and right roof-rail air bag modules at no cost.
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Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The rear fuel tank may collapse, blocking the fuel pump from moving fuel to the front tank and causing the engine to stall.
What the fix does
Dealers will inspect and replace the fuel tank and fuel pump module as needed, and install a vent hose on the rear tank.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
An electrical short circuit can develop in the engine-block heater cable or its connection terminals, potentially causing overheating or electrical failure.
What the fix does
Dealers will replace the engine-block heater and heater cord at no cost. Previously disabled heaters and those in prior recall 19V-328 will also receive replacement cords, rerouted as needed.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The engine block heater cord or its terminals may short circuit and fail, affecting certain diesel-equipped Silverado and Sierra trucks.
What the fix does
Dealers will replace the engine block heater free of charge. On some models, they will also install a rerouted heater cord.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The fuel-level sensor in the front tank may stick, preventing it from reading correctly. This allows fuel from the rear tank to overfill the front tank.
What the fix does
Dealers will replace the rear-tank fuel-pump module and inspect the front tank, replacing it if needed.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The front seat belt retractors have an incorrect torsion bar that may prevent the seat belts from working properly in a crash.
What the fix does
Dealers will replace both front seat belt retractor assemblies at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
