2021 GMC Yukon XL
The 2021 GMC Yukon XL is a full-size SUV offering a spacious interior, robust towing capability, and a comfortable ride. The 2021 model marked the start of the fifth generation, introducing a new independent rear suspension and updated styling. Engine options include the 5.3L EcoTec3 V8 (355 hp, 383 lb-ft of torque), the 6.2L EcoTec3 V8 (420 hp, 460 lb-ft of torque), and the 3.0L Duramax Turbo-Diesel I6 (277 hp, 460 lb-ft of torque). All engines are paired with a 10-speed automatic transmission. Owners often praise the Yukon XL for its spaciousness, particularly in the third row, as well as its smooth ride and powerful engine options. Common complaints include the large size making it difficult to maneuver in tight spaces, as well as the high price point. Some have also reported issues with the infotainment system and electronic components.
Engine
5.3L EcoTec3 V8
- Active Fuel Management (AFM)/Dynamic Fuel Management (DFM) Lifter Failure
- Description/Symptoms: The AFM/DFM system deactivates cylinders to improve fuel economy. Lifter failure in this system is a common issue, leading to misfires, rough running, and potential damage to the camshaft. Engine may have a ticking or knocking sound.
- Solution: Replacement of the failed lifters and potentially the camshaft. Complete AFM/DFM delete kits are also available as a permanent solution.
- Estimated Cost to Fix: $3,000 - $6,000+
- Recalls: None Found
- Oil Consumption
- Description/Symptoms: Excessive oil consumption, sometimes exceeding 1 quart every 1,000 miles. This can lead to low oil levels and potential engine damage if not monitored closely.
- Solution: In some cases, a redesigned valve cover or PCV system components can help. More severe cases may require piston ring replacement.
- Estimated Cost to Fix: $500 - $5,000+
- Recalls: None Found
6.2L EcoTec3 V8
- Active Fuel Management (AFM)/Dynamic Fuel Management (DFM) Lifter Failure
- Description/Symptoms: Similar to the 5.3L, the AFM/DFM system can experience lifter failure, leading to misfires, rough running, and potential camshaft damage.
- Solution: Replacement of the failed lifters and potentially the camshaft. Complete AFM/DFM delete kits are also available as a permanent solution.
- Estimated Cost to Fix: $3,000 - $6,000+
- Recalls: None Found
- Oil Consumption
- Description/Symptoms: Excessive oil consumption, similar to the 5.3L engine.
- Solution: In some cases, a redesigned valve cover or PCV system components can help. More severe cases may require piston ring replacement.
- Estimated Cost to Fix: $500 - $5,000+
- Recalls: None Found
3.0L Duramax Turbo-Diesel I6
- Fuel Injector Issues
- Description/Symptoms: Some owners have reported issues with fuel injectors causing rough idling, decreased fuel economy, and potential engine misfires.
- Solution: Replacement of the faulty fuel injectors.
- Estimated Cost to Fix: $1,200 - $2,500+
- Recalls: None Found
Transmission
10-Speed Automatic (All Engines)
- Harsh Shifting/Hesitation
- Description/Symptoms: The 10-speed automatic transmission can exhibit harsh or erratic shifting, especially between lower gears. Some owners also report hesitation when accelerating.
- Solution: A software update or transmission re-learn procedure might resolve the issue. In some cases, valve body replacement is required.
- Estimated Cost to Fix: $100 (software update) - $2,500+ (valve body)
- Recalls: None Found
- Torque Converter Issues
- Description/Symptoms: Torque converter shudder or vibration at lower speeds.
- Solution: Transmission flush and fluid replacement may resolve the issue. Torque converter replacement is sometimes necessary.
- Estimated Cost to Fix: $300 (fluid change) - $1,500+ (torque converter)
- Recalls: None Found
Suspension
- Air Ride Suspension Compressor Failure (If Equipped)
- Description/Symptoms: The air ride suspension system, available on some trims, can experience compressor failure, resulting in the vehicle sitting unevenly or not maintaining proper ride height.
- Solution: Replacement of the air compressor.
- Estimated Cost to Fix: $800 - $1,500+
- Recalls: None Found
Electrical
- Infotainment System Freezing/Crashing
- Description/Symptoms: The infotainment system can freeze, crash, or become unresponsive. This can affect navigation, audio, and climate control functions.
- Solution: Software updates can sometimes resolve the issue. In some cases, the infotainment system module may need to be replaced.
- Estimated Cost to Fix: $0 (software update) - $1,000+ (module replacement)
- Recalls: None Found
- Battery Drain Issues
- Description/Symptoms: Some owners have reported issues with the battery draining prematurely, especially if the vehicle sits for an extended period.
- Solution: Check for parasitic draws. Update Body Control Module (BCM) software. Battery replacement.
- Estimated Cost to Fix: $0-$300+
- Recalls: None Found
Exterior
- Automatic Running Boards Failure (If Equipped)
- Description/Symptoms: The automatic running boards can fail to deploy or retract properly, or can become stuck in one position.
- Solution: Lubrication of the joints. Replacement of the motor or the entire running board assembly.
- Estimated Cost to Fix: $50 - $1,000+
- Recalls: None Found
Interior
- Seat Heater/Cooler Malfunction
- Description/Symptoms: The seat heaters or coolers can fail to operate properly, or can become stuck on one setting.
- Solution: Replacement of the heating/cooling element or the control module.
- Estimated Cost to Fix: $300 - $800+
- Recalls: None Found
Summary
The 2021 GMC Yukon XL has some notable issues, particularly with the engine’s AFM/DFM system and the 10-speed transmission. Lifter failures and harsh shifting are among the most concerning and potentially costly problems. The infotainment system and air suspension can also present headaches for owners. While some issues can be resolved with software updates, others may require significant repairs, potentially leading to high repair costs. Potential buyers should be aware of these common problems and consider purchasing an extended warranty or thoroughly inspecting a used vehicle before purchasing.