2018 Chevrolet Tahoe Engine Problems

While driving at 45 mph, your engine gradually lost power, displayed an "Engine Power Reduced" warning, and then shut off completely without restarting. The dealership diagnosed a severe problem with the crankshaft in cylinder one that requires a complete engine replacement, estimated at $17,000.

Your engine has completely failed because the camshaft was destroyed, likely due to a problem with the lifters. This is a serious mechanical failure that will require engine work or replacement. The repair will involve replacing or rebuilding the engine and its internal components.

Your transmission suddenly locked up while driving without any warning lights. The dealer found that your engine lifters had also failed, and both issues required $15,000 in repairs just after your warranty expired at 55,000 miles. The mechanic indicated this is a known recurring problem with Tahoes like yours, suggesting a potential design issue rather than a manufacturing defect specific to your vehicle.

While driving at 35 mph, your Tahoe suddenly lost engine power and stalled. After restarting, the check engine and ABS warning lights came on. The dealer found that the crankshaft pushrods failed and damaged the engine, requiring a complete engine replacement. This is a serious internal engine failure that left your vehicle undriveable.

Your engine suddenly stopped working while you were accelerating onto the interstate, forcing you to pull over in a remote area. The dealership confirmed your engine failed completely and needs to be replaced. No warning lights appeared before the engine gave out, which put you and your family at risk while stranded on the highway.

Your check engine light has been flashing while driving, especially on the highway, and your vehicle feels sluggish when accelerating or going uphill. Two separate mechanics found misfire readings in your cylinders (one found two cylinders misfiring, the other found three), which means your engine isn't firing properly in those cylinders. This issue needs attention soon, as misfires can affect engine performance and safety. The fix will likely involve diagnosing which cylinders are misfiring and replacing spark plugs, ignition coils, or fuel injectors as needed.

Your engine is making abnormal rattling and knocking sounds when you start it, even though no warning lights are on. A dealer inspection found that your camshaft and valve train need to be replaced. This issue may be related to a known recall (Campaign 25V274000), but your vehicle's VIN isn't included in that recall coverage.

Your transmission is experiencing slippage, which means it's not engaging properly with the engine. This can cause a loss of power when accelerating or difficulty maintaining speed. The issue appears to be a manufacturing defect, though it's not included in the recent GMC recall from April-May 2025. Fixing this will likely require transmission fluid service, seal replacement, or internal transmission repair.

The repeated failure of the fuel pumps, despite replacement three times, poses a significant safety concern as the vehicle may not start immediately, potentially leading to issues while on the road. This delay in starting could result in the vehicle not running properly, potentially shutting off unexpectedly, which poses a danger to the safety of the driver and others on the road. Additionally, the uncertainty surrounding the effects of using E85 fuel, despite the vehicle being sold as flex fuel, raises concerns about the long-term viability of the motor and overall vehicle performance. It's imperative to address this issue promptly to ensure the safety of all road users and preserve the longevity of the vehicle's components.

AC stopped blowing cold air due to a broken condenser weld issue commonly found in previous recalls 2014-2017

The contact owns a 2018 Chevrolet Tahoe. The contact stated that while driving approximately 65 MPH, the vehicle decelerated and abruptly slowed down and lost motive power. The check engine warning light was illuminated. The vehicle was towed to an independent mechanic who informed the contact that the SMR lifter and the engine failed. The contact called the local dealer who informed her that the parts were back ordered but the vehicle was not diagnosed or repaired. The manufacturer was notified of the failure but provided no additional assistance. The approximate failure mileage was 104,163.

The contact owns a 2018 Chevrolet Tahoe. The contact stated while driving at various speeds, the vehicle stalled with the check engine warning light illuminated on the instrument panel. Recently, the contact had the vehicle towed to a dealer where they diagnosed the vehicle with engine failure. The contact was notified of the diagnosis and the dealer recommended that the engine be replaced. The manufacturer was notified of the failure and the contact was provided a case number. The vehicle was not repaired and remained in the possession of the dealer. The failure mileage was 22,949.

Transmission issues on 2018 Chevy Tahoe. The vehicle stopped on the Hwy. Dealership says the transmission needs to be replaced. Is uncertain why the transmission has gone out on the vehicle since it’s only 4 years old. Error message came on my vehicle and I called the dealership. From my research it appears Chevrolet is continuing to have problems with the transmission on its Tahoes. This is unexceptionable. The consumer has to pay the price not the manufacturer. Please assist.