2023 Gmc Sierra 1500 — Known Issues & Recalls

Your truck's engine seized at 60,000 miles even though you completed the recall procedure in January and the engine passed its test at that time. You were also using the recommended 0W-40 oil and following all guidelines, but the engine still failed. The engine will likely need to be replaced or completely rebuilt since it seized.

Your engine experienced a sudden, complete internal failure without any warning lights or signs beforehand while driving on the highway. The truck lost all power and stopped dead in a busy merge lane, leaving you stranded in traffic for over two hours in dangerous conditions. The dealership confirmed it was a full engine failure and replaced the engine under warranty at just over 37,000 miles. Engine replacement typically involves removing the failed engine and installing a new or remanufactured engine.

Your 2023 Sierra 1500's 6.2L engine has a known safety issue that's subject to a critical recall, but you're unable to get a service appointment for over 5 months. With the high mileage you're driving weekly (800-1000 miles), you're concerned about potential engine failure, accident risk, or fire while waiting for the repair. The fix will require a dealer service appointment to address the recalled engine defect.

Your diesel Sierra's DEF (Diesel Exhaust Fluid) system heater failed, which is built into the tank itself—meaning the entire DEF tank needs to be replaced. When this system fails, your truck may go into reduced power mode while driving, which could be unsafe in traffic. Your truck has been out of service since the failure, and the replacement tank is currently on national backorder with no confirmed delivery date.

Your engine is consuming one quart of oil every 2,000 miles, even though it has fewer than 40,000 miles. While GM's internal service bulletin states this consumption rate is acceptable for your engine, this means you'll need to add oil between regular oil change intervals. Over time, this excessive oil consumption could lead to more serious engine problems and potential engine damage.

While driving normally, a front grille trim piece detached from your vehicle without any impact and struck your windshield, creating a safety hazard. There was no prior damage or warning before it came loose. The manufacturer was notified but declined responsibility. This defect in the attachment or design of exterior trim parts poses a risk to you and other drivers on the road.

Your grille deflector detached and flew off while you were driving. This appears to be the same issue that occurred on the 2022 Sierra model. The deflector will need to be reattached or replaced to prevent it from coming loose again.

Your truck's grille deflector detached and flew off while driving at 80 mph on the highway. This is a potential safety hazard since loose parts can strike other vehicles or create debris on the road. The deflector will need to be reattached or replaced to prevent this from happening again.

The upper section of your front grille detached and fell off while you were driving. This appears to be a structural attachment failure rather than normal wear. The grille will likely need to be reattached or replaced to restore the front end appearance and prevent further pieces from coming loose.

Your truck's top grille molding detached and flew off while you were driving. This appears to be a fastening or attachment issue with the grille trim piece.

Your Sierra is experiencing abnormal shuddering when driving at speeds above 30 MPH, even though no warning lights appear on your dashboard. The dealer found that your transmission's valve body needs to be replaced to fix this issue. Unfortunately, the problem returned about six months after the initial repair was completed.

While driving onto the freeway at 45 mph without towing, your truck's rear wheels suddenly locked up for a moment, then the truck went into limp mode and your dashboard displayed a warning to reduce speed and service the transmission. The dealer found transmission fault codes (P0700 and P0747) and determined the spacer plate, check balls, and valve needed replacement. You mentioned the dealer said they installed an updated valve, but you're uncertain if this was reflected on your repair order, and you questioned whether GM's extended warranty coverage would apply to this repair.

While driving at 65 mph on the highway with your family, your 2023 GMC Sierra suddenly shuddered violently and lost speed down to 30 mph without warning, despite your efforts to accelerate. Your truck displayed warning messages about reduced acceleration mode, emission system control failure, and a check engine light, and continued shuddering and losing speed even after you turned it off and back on. The dealership found a P129F engine malfunction code and replaced the fuel pump power control module under warranty to fix the issue.

Your 2023 GMC Sierra 1500 underwent a safety recall service in February 2026, where the dealer performed diagnostic testing, changed your oil to a heavier viscosity (0W-40), and replaced the oil filler cap — all indicating your engine passed inspection. However, approximately 48 hours after this service, your engine completely failed while driving, causing a sudden loss of power and creating a safety hazard. The dealer confirmed the failure and replaced both the engine and radiator.

Your transmission is slipping and slamming into gears while driving. Additionally, your rear brakes have locked up multiple times while driving at highway speeds, which is dangerous and scary. Your vehicle is showing a P0747 diagnostic code. You'll need a transmission inspection and brake system diagnostic to identify what's causing these issues.

Your GMC Sierra's front grille detached and hit your windshield while driving on the interstate, creating a safety hazard as it was thrown into traffic. Your tailgate also opens on its own, though the grille detachment is your primary concern. GM has refused to cover this repair under existing recalls for 2022 and earlier models, even though your 2023 appears to have the same issue. The fix will likely involve a recall service appointment where technicians will either secure or replace the grille assembly with updated fasteners or a redesigned grille.

Your engine completely shut down without any warning while driving at 75 mph on the highway, forcing you to be towed. The dealer determined the engine needs to be replaced due to failure. Even though you had a recall service completed in September with new oil and the approved cap, the engine still failed, suggesting this may be a recurring issue with this engine model.

Your vehicle's Anti-Lock Braking System (ABS) and Forward Collision Warning system suddenly failed while driving, with multiple warning lights appearing on the dashboard and a message limiting your speed to 36 mph. The dealership determined this was a software issue and required a $300+ software update to restore proper braking and safety system function, even though your vehicle was only about 3,000 miles outside of warranty. This type of sudden failure in a critical safety system is concerning and may warrant further investigation beyond standard maintenance.

While driving on the highway at 80 mph, a piece of your front grille suddenly detached and flew off, hitting the roof of your truck. This appears to be a structural attachment issue with the grille assembly. The fix would likely involve having the grille inspected and either reattached or replaced with proper fasteners.

Your rear backup camera stopped working without any warning. When you put the vehicle in reverse, a red triangle with a camera icon appeared on the screen. The dealership diagnosed an internal failure in the camera and replaced it on 3/23/26, though they didn't return the failed part to you.