2024 GMC Yukon Xl

The 5.3L L84 and 6.2L L87 V8 engines with Dynamic Fuel Management (DFM) suffer from premature hydraulic lifter collapse, the most widespread complaint across the T1XX platform. Symptoms include a loud ticking or knocking noise, engine misfires, check engine lights, and in severe cases, camshaft damage from the collapsed lifter riding on the cam lobe. Failures have been reported at very low mileages.

Dealer replaces the failed lifters, VLOM assembly, and potentially the camshaft under the powertrain warranty. Reference GM TSB 15-06-01-002F for diagnostic procedures. GM has also extended component coverage for repeat lifter repairs on some VINs. Some owners install an AFM/DFM delete kit to eliminate the cylinder deactivation system entirely.

The 10L80 ten-speed automatic transmission exhibits harsh shifts, shuddering at highway speeds, and delayed engagement from Park. Some owners experience a momentary rear wheel lockup condition due to internal control valve wear. The transmission may also hunt between gears while cruising, unable to settle on the optimal gear ratio for the driving conditions.

GM issued Recall N242454440 for updated TCM software that monitors internal valve wear and limits the transmission to 5th gear before lockup can occur. A transmission fluid flush with Mobil 1 Synthetic LV ATF HP may resolve shudder. If internal damage has occurred, the valve body or complete transmission may need replacement.

The optional air ride adaptive suspension system on the Yukon XL develops compressor failures, air spring leaks, and ride height sensor malfunctions. The rear of the vehicle may sag after sitting overnight, or one corner may sit noticeably lower than the others. The 'Service Suspension System' warning appears on the dash, and the ride quality degrades significantly.

Diagnose the air suspension system to identify the leaking component. Replace air springs, the compressor, or ride height sensors as needed. The air compressor relay can also fail, preventing the compressor from running. Perform a leak-down test on each air spring before replacing the compressor. Reference GM TSB 21-NA-167 for air suspension diagnosis.

The infotainment system with the 10.2-inch touchscreen freezes, goes black, and reboots randomly. The rear seat entertainment screens may also fail to mirror content, lose audio sync, or become unresponsive. Apple CarPlay and Android Auto disconnect frequently, and the rearview camera display can lag or show a frozen image when shifting into reverse.

Dealer performs infotainment software updates. GM has released multiple over-the-air and dealer-installed updates to address stability and connectivity issues. A system reset (holding the home button) may resolve temporary freezes. If the infotainment module is faulty, it must be replaced. Ensure USB cables used for CarPlay/Android Auto are high-quality and short.

The exhaust manifold bolts on the 5.3L and 6.2L V8 engines break from thermal cycling, causing exhaust leaks. The leak produces a ticking noise on cold starts that may diminish as the engine warms and the manifold expands. Exhaust fumes can enter the cabin through the HVAC fresh air intake, creating a health hazard. This is a chronic issue on GM V8 engines across multiple generations.

Remove the broken exhaust manifold bolts using extraction tools or drilling, install new bolts, and replace the exhaust manifold gasket. If the manifold is cracked or warped, it must be replaced. Updated exhaust manifold bolts with improved metallurgy are available. The rear driver-side manifold is the most difficult to access.