Some users have reported excessive oil consumption in GM's L83 engines, which might require more frequent oil top-ups or checks.

The Active Fuel Management (AFM) system can sometimes lead to lifter failure, causing engine noise and performance issues.

Direct injection engines like the L83 can experience carbon buildup on intake valves, which may affect performance and fuel efficiency over time.

Premature wear of the timing chain may occur, leading to noise and potential engine damage if not addressed.

Problems with fuel injectors can lead to misfires or reduced engine performance, requiring cleaning or replacement.

Some owners have reported coolant leaks from hoses or the radiator, which can lead to overheating if not fixed.

Although not directly related to the engine, some GMC Yukon models have experienced transmission shudder, which might feel like engine problems.

Hydraulic brake systems rely on fluid to function properly, and leaks can lead to reduced braking performance.

Air in the hydraulic brake lines can cause the brake pedal to feel spongy, reducing braking efficiency.

Brake pads and rotors can wear out over time, leading to reduced braking performance and the need for replacement.

Direct injection engines like the L5P can experience problems with fuel injectors, including clogging or failure.

The L5P DURAMAX engine uses a turbocharger, which can suffer from issues such as lag, overboost, or failure.

Diesel engines with DPF systems can experience clogging, leading to reduced performance and the need for regeneration or cleaning.

Diesel engines rely on glow plugs for cold starts, and failure can make starting the engine difficult in cold weather.

EGR valves can become clogged or fail, leading to increased emissions and reduced engine performance.

The V-shaped engine configuration can lead to hot spots in the cooling system, causing overheating or coolant leaks.

Diesel engines can suffer from fuel contamination, leading to injector or fuel pump damage.

The GMC Sierra can experience issues with transmission shifting, especially in higher-mileage vehicles.

Modern vehicles, including the 2018 GMC Sierra, can suffer from electrical problems such as sensor failures or wiring issues.

Issues with dynamic brake support not activating or responding correctly, possibly due to sensor malfunctions or software issues.

Problems with the VVT system can cause rough idling, poor acceleration, and increased emissions due to oil control valve failures or timing chain wear.

Direct injection engines can experience carbon build-up on intake valves, leading to reduced performance, rough idling, and poor fuel economy.

Misfires in the V-shaped 6-cylinder engine can be caused by ignition coil failures, faulty spark plugs, or fuel injector issues.

Overheating can occur due to coolant leaks, water pump failures, or radiator issues, which are common in the 2018 GMC Canyon.

The automatic transmission may experience hard shifts, delayed engagement, or slipping, often due to transmission control module (TCM) or valve body issues.

Fuel pump problems can lead to stalling, difficulty starting, or loss of power, especially under heavy load or acceleration.

Excessive oil consumption can be an issue with the LGZ engine, often due to piston ring wear or valve seal problems.

Premature wear of the timing chain can cause rattling noises, poor engine performance, and potential engine damage if not addressed.

Issues with the ETC can cause erratic idling, poor throttle response, and engine stalling.

Exhaust leaks can occur at the manifold or gaskets, leading to increased noise, emissions issues, and potential damage to other components like the catalytic converter.

Sometimes, the system may not activate as expected due to sensor malfunctions or software glitches.

This can be caused by faulty spark plugs, ignition coils, or issues with the fuel injectors.

The L86 engine is known to consume more oil than expected, often due to the Active Fuel Management (AFM) system.

Direct injection engines like the L86 can experience carbon buildup on the intake valves, affecting performance.

Over time, the timing chain may stretch or wear, leading to engine timing issues.

The fuel pump or fuel injectors may fail or become clogged, especially when using E85 fuel.

Radiator or water pump failures can lead to overheating.

The VVT system may experience solenoid or actuator failures, causing poor engine performance.

Issues with wiring or sensors can lead to various engine and vehicle performance problems.

Problems with the catalytic converter or exhaust manifold can lead to reduced efficiency and performance.