2018 Chevrolet Tahoe — Known Issues & Recalls

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.

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 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.

Your transmission is slipping and not engaging properly, causing the engine to rev without smooth acceleration and random RPM fluctuations even at steady speeds. You may notice the car struggles going uphill then suddenly accelerates unexpectedly, with no warning lights to alert you to the problem. This likely requires a transmission rebuild or replacement to restore proper gear engagement and power delivery.

Your car started shaking badly while driving, and your check engine light came on. The dealer found a transmission problem and repaired it, but the same issue happened again. You may need the transmission inspected or serviced to prevent this shaking from returning.

Your transmission is overheating, which is causing your truck to go into limp mode (reduced power mode to protect the transmission). This happens repeatedly and limits your ability to drive normally. The transmission may need servicing or fluid replacement to address the overheating issue.

Your transmission failed at 94,000 miles. You've been experiencing engine misfires since 80,000 miles, likely related to issues with the Active Fuel Management (AFM) and Displacement on Demand (DOD) system. Despite spending $10,000 on repairs, the problem hasn't been fully resolved. The fix may require transmission overhaul or replacement, along with diagnosis and repair of the AFM/DOD system components.

Your vehicle jerks or shudders when shifting gears, braking, and accelerating. Your check engine light is on, and you've noticed there's a recall for the same issue on 2018 models. A mechanic will need to read your check engine code and inspect the transmission and engine systems to diagnose the jerking.

After your dealership installed a new Body Control Module (BCM) in April 2025, your trailer braking system has malfunctioned, causing unintended brake activation that pulls your vehicle to one side — creating a safety risk. The dealership initially said you needed a BCM replacement to fix a tire pressure monitor error, but now claims the brake problems aren't related to the BCM. You may need the BCM reprogrammed or replaced again, though the dealership is charging $600 in labor to attempt another fix.

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 windshield was replaced with an aftermarket (non-Chevrolet) part after damage in 2024. In May 2025, the forward collision avoidance camera behind your rearview mirror stopped working, and the dealer determined the non-OEM windshield caused the failure. The camera couldn't be recalibrated and your vehicle wasn't repaired.

Your brake pedal requires excessive force to depress when starting the vehicle, and the engine doesn't respond normally when you press the accelerator. The dealer diagnosed a faulty brake vacuum pump that's preventing proper brake assist from working. Replacing the brake vacuum pump should restore normal braking and engine response.

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 Tahoe displayed a "Power Steering Assist Fault" message and became hard to steer in both directions while parked. The first mechanic attributed this to a weak 12-volt battery and replaced it, restoring steering function temporarily. However, the same power steering assist failure occurred again several weeks later with the same fault message, suggesting the problem may not have been fully resolved by the battery replacement alone.

You've reported multiple noises and performance issues with your Tahoe starting at 4,100 miles, including undercarriage noise, engine fluttering, hard shifting, and poor performance. Despite visiting the dealership several times during the warranty period, the service department either found no problems or attributed issues to cold weather and exhaust sounds—no repairs were completed. Now that your warranty has expired, you're being told the camshaft, lifters, struts, and transmission all need expensive repairs, and the dealership says the vehicle isn't safe to drive. You believe these issues should have been addressed during warranty through recalls or proper service.

You're noticing a gasoline smell inside your cabin and in your garage. Your mechanic identified that the fuel injector seals are leaking, which they indicated is a known issue covered by safety bulletin 18-NA-137 from November 2019. Fixing this will likely involve replacing the fuel injector seals to stop the leak.

Your roof racks have cracked and deteriorated from sun exposure, causing water leaks into the cargo area that have damaged the headliner. The paint on your roof and hood also failed and required repainting before ceramic coating. You've attempted to reseal the racks with silicone sealant since full replacement or removal would require taking apart the entire headliner to access the bolts. A permanent fix would likely involve either replacing the roof racks or properly resealing and reinforcing them to prevent future water intrusion.