The 2019 GMT K2XX platform Yukon is generally solid, but the 5.3L V8 suffers from Active Fuel Management (AFM/Dynamic Fuel Management) lifter failures that can grenade the engine, and the 8L90 8-speed transmission has a known oil cooler line design flaw that leaks internally into the radiator.
AFM Lifter Failure Leading to Catastrophic Engine Damage
Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Ticking or tapping noise from engine at startup that may come and go, Check engine light with P0300-P0308 misfire codes or P0521 oil pressure codes, Metal shavings in oil filter or on magnetic drain plug, Loss of power and rough running if lifter roller fails completely
Fix: AFM lifters collapse or fail mechanically, dropping metal debris through the engine. Proper fix requires lifter replacement on affected bank (8-12 hours) or full AFM delete with cam swap and tune (16-20 hours). If ignored and metal circulates, you're looking at complete engine replacement or rebuild with all pistons, rings, bearings, and crank polishing. Many shops now recommend preemptive AFM delete on high-mileage units.
Estimated cost: $2,500-4,500 for lifters only, $8,000-12,000 for engine rebuild/replacement if caught late
Transmission Oil Cooler Line Internal Leak (8L90)
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid in coolant overflow or radiator (fluid appears pink/milky), Check engine light with transmission codes, harsh or delayed shifts, Overheating transmission temp gauge or limp mode, White or pink residue in coolant reservoir
Fix: The quick-connect oil cooler lines at the radiator corrode internally or the seals fail, allowing transmission fluid and coolant to mix. Requires replacement of both cooler lines, radiator flush, transmission fluid flush (sometimes full pan drop and filter), and possibly torque converter if contamination is severe. Labor 4-6 hours plus flush procedures. Caught early, trans survives; caught late, you're rebuilding the 8L90.
Estimated cost: $1,200-2,200 if caught early, $4,000-6,000+ if transmission damaged
Transmission Mount Failure
Occasional · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Vibration at idle or under acceleration, Excessive driveline movement visible under throttle application
Fix: The rear transmission mount (crossmember-side rubber mount) tears or separates, especially on vehicles that tow or see heavy use. Replacement is straightforward with a transmission jack to support the tail housing while swapping the mount. 1.5-2.5 hours labor.
Estimated cost: $250-500
Wheel Speed Sensor / Tone Ring Corrosion (NHTSA Recall)
Occasional · medium severity
Symptoms: ABS light, traction control light, or StabiliTrak warnings on dash, Loss of ABS function or traction control during braking, Intermittent warnings especially in wet/cold conditions
Fix: Corrosion on wheel speed sensor tone rings (especially rear) causes erratic ABS/traction signals. GM issued a recall for certain VINs, covering sensor and tone ring replacement. If your VIN isn't covered, aftermarket sensors are available but labor involves hub work. 1-2 hours per corner.
Estimated cost: $0 if recall applies, $300-600 per corner if not
Air Conditioning Condenser Leaks
Occasional · low severity
Typical onset: 50,000-100,000 mi
Symptoms: AC blows warm intermittently or stops cooling altogether, Low refrigerant on recharge, leaks down within weeks, Oily residue on front of condenser behind grille
Fix: The condenser mounted in front of the radiator is prone to rock damage and pinhole corrosion leaks. Replacement requires front bumper and grille removal, evacuation/recharge of the system. 3-4 hours labor. Consider an upgraded heavy-duty condenser if you drive gravel roads.
Estimated cost: $600-1,100
Fuel Pump Module Failure
Rare · high severity
Typical onset: 80,000-140,000 mi
Symptoms: No-start or extended crank before starting, Loss of power or stalling under load, Check engine light with low fuel pressure codes (P0087, P0089), Whining noise from fuel tank area
Fix: Fuel pump module (pump, filter, level sender integrated) fails or the filter sock clogs. Requires tank drop or access through rear seat/floor if access panel present. 2-4 hours labor depending on tank level and access method. Use OEM or high-quality aftermarket; cheap pumps fail quickly.
Estimated cost: $800-1,400
Owner tips
Disable AFM with an AFM disabler module or tune if you plan to keep the truck past 80k miles — it's cheaper than an engine rebuild.
Check transmission cooler lines and radiator cap for any fluid cross-contamination every oil change; catching ATF in coolant early saves the transmission.
Use full-synthetic oil (0W-20 or 5W-30 per manual) and change at 5,000 miles or less if you tow — these AFM engines are oil-quality sensitive.
Inspect the condenser for rock damage annually if you drive gravel; a $40 stone guard can prevent a $1,000 repair.
Buy one if you can afford an AFM delete or the 6.2L engine option, and verify the transmission cooler lines have been addressed — otherwise, budget $3,000-5,000 for inevitable engine or trans repairs by 100k miles.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Located under hood on passenger side; AGM battery required for vehicles with start-stop technology
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Every control module on the 2018-2020 GMC Yukon — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Integrated trailer brake controller. Calibration may be needed.
Headlamp Control Module (HCM)0.7 hr R&Raftermarket tool +0.3 hrwith LED or HID headlamps▸ programming details
📍 Behind left headlamp assembly in engine compartment
🔧 Autel MaxiSys or GM SPS2
⚠️ Halogen headlamps do not use separate HCM. LED/HID systems require module for adaptive lighting.
Fuel Pump Control Module (FPCM)0.6 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under vehicle, mounted to frame rail ahead of fuel tank
🔧 GM SPS2 or Autel
⚠️ Simple relearn procedure. Controls fuel pump speed based on ECM commands.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE) · 26V289000
2026-05-07
General Motors, LLC (GM) is recalling certain 2026 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, and Tahoe, and GMC Sierra 1500, Yukon, and Yukon XL vehicles with four-wheel (4WD) or all-wheel drive (AWD), and certain 2015-2020 Suburban, Escalade, Escalade ESV, Yukon, Yukon XL, and Tahoe vehicles. A component missing from the drivetrain transfer case may cause the front and/or rear wheels to lock up without warning to the driver.
Consequence: Front or rear wheel lockup increases the risk of a crash.
Remedy: Owners are advised not to drive their vehicle until the remedy is completed. Dealers will inspect and, if necessary, replace the transfer case assembly, free of charge. Owner notification letters were mailed May 18, 2026. Owners may contact GMC customer service at 1-800-462-8782, Chevrolet customer service at 1-800-222-1020 or Cadillac customer service at 1-800-333-4223. GM's number for this recall is N262557620. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on May 7, 2026.
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING · 19V761000
2019-10-24
General Motors LLC (GM) is recalling certain 2015-2020 Chevrolet Suburban, Tahoe, and GMC Yukon, and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a 3.08-ratio rear axle and four-wheel drive. If a wheel-speed sensor fails, while the vehicle is traveling between 41 and 60 mph in four-wheel or automatic mode, the Electronic-Brake Control Module (EBCM) software may activate the driveline-protection system.
Consequence: Unintended activation of the driveline-protection system will cause unintended braking on the wheel on the opposite side of the failed sensor, causing the vehicle to pull to one side unexpectedly, increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will reprogram the EBCM, free of charge. The recall began December 11, 2019. Owners may contact Chevrolet customer service at 1-800-630-2438 or GMC customer service at 1-800-462-8782. GM's number for this recall is N192261050.
Performance
Horsepower
355hp
Torque
383lb-ft
0–60 mph
6.7sec
Quarter mile
15.1sec
Top speed
112mph
Fuel economy (EPA)
City
15mpg
Highway
22mpg
Combined
18mpg
Fuel
Regular Gasoline
Capability & size
Towing capacity
8,500lb
Payload
1,730lb
Curb weight
5,586lb
EPA class
Standard Sport Utility Vehicle 2WD
Wiper blades
2015-2020 GMT K2XX generation. Some sources show 22/22, others 22/21. Most common is 22/22.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2019 GMC Yukon 5.3L V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.