The 2002 GMT800 Yukon XL is a solid workhorse when maintained, but the 5.3L Vortec suffers from catastrophic piston slap and AFM-related issues (though 2002 predates AFM), while the 4L60E/4L65E transmissions have well-documented weaknesses around fluid cooling and torque converter clutch operation.
Symptoms: Loud knocking/slapping on cold start that quiets after warm-up, Progressive loss of compression in one or more cylinders, Metal shavings in oil, eventual catastrophic failure with connecting rod damage
Fix: Early-stage slap can be monitored, but once compression drops or knock persists warm, you're looking at short block replacement or full rebuild with oversized pistons. 18-24 labor hours for short block swap.
Estimated cost: $3,500-6,500
Transmission Cooler Line / Radiator Cooler Failure (4L60E/4L65E)
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Transmission fluid in coolant or coolant in transmission (strawberry milkshake fluid), Transmission slipping, delayed engagement, or complete failure, Overheating transmission, burnt ATF smell
Fix: Radiator internal cooler fails, cross-contaminating fluids. Requires radiator replacement, external cooler addition, transmission flush (if caught early) or full rebuild if contamination caused clutch damage. 8-12 hours labor for trans rebuild.
Estimated cost: $800-3,200
Intake Manifold Gasket Leak (5.3L/6.0L Vortec)
Common · medium severity
Typical onset: 75,000-130,000 mi
Symptoms: Coolant weeping from intake manifold seam, especially passenger side, Slow coolant loss without visible external leaks, Rough idle, possible coolant smell in cabin
Symptoms: Hard starting, especially when hot, Intermittent stalling or loss of power under load, Fuel smell, visible leak at regulator (mounted on fuel rail)
Fix: Fuel pump in-tank wears out or pressure regulator diaphragm fails. Pump requires tank drop (3-4 hours), regulator is easier (1.5 hours) but often both are due simultaneously.
Estimated cost: $500-1,200
HVAC Blend Door Actuator Failure
Common · low severity
Symptoms: Clicking/ticking noise from dash on startup or temp adjustment, Inability to change temperature—stuck on hot or cold, Erratic airflow temperature changes while driving
Fix: Plastic actuator gears strip. Multiple actuators in system; main temp actuator is behind glove box (2 hours), others require more dash disassembly (4-6 hours for mode door).
Estimated cost: $250-700
Rear Differential Pinion Seal Leak (9.5" 14-Bolt)
Occasional · medium severity
Typical onset: 90,000-150,000 mi
Symptoms: Gear oil dripping from front of rear differential, Low fluid causes whining or howling under acceleration, Visible oil coating on driveshaft and undercarriage
Fix: Pinion seal hardens and fails. Requires driveshaft removal, seal replacement, fluid refill. If bearing preload is off, pinion bearing replacement adds complexity. 2-3 labor hours.
Estimated cost: $300-650
Steering Gear Box / Pitman Arm Wear
Occasional · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: Excessive play in steering wheel (more than 2 inches of free play), Wandering on highway, constant correction needed, Clunking over bumps from front end
Fix: GMT800 steering boxes develop internal wear, pitman/idler arms wear out bushings. Steering box replacement is 3-4 hours; full front-end refresh (box, arms, links) takes 6-8 hours.
Estimated cost: $600-1,800
Owner tips
Install an auxiliary transmission cooler BEFORE the factory radiator cooler fails—it's cheap insurance against a $3K trans rebuild.
Check oil consumption every 1,000 miles after 100K; excessive use (>1 qt/1000 mi) signals piston ring or valve seal issues brewing.
Use Dexron VI ATF and change it every 50K regardless of 'lifetime fill' claims—4L60E longevity depends on clean fluid.
Inspect intake manifold for coolant weeping annually after 70K miles; catching it early prevents overheating damage.
Buy it if the transmission has been maintained and there's no piston slap on cold start—otherwise you're gambling on two $3K+ repairs within 20K 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: Side post terminals standard on GM trucks; battery located under hood on driver side
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Every control module on the 2000-2006 GMC Yukon XL — 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.
📍 Inside transmission, integrated with valve body (4L60E/4L65E/4L80E transmissions)
🔧 Tech 2 with TIS2000/TIS2Web
⚠️ Requires transmission pan removal and valve body disassembly. VIN programming required. Adaptive learn reset needed.
Transfer Case Control Module (TCCM)2.5 hr R&Rrelearn only +0.3 hr4WD/AWD models with electronic shift▸ programming details
📍 Inside transfer case, integrated with encoder motor assembly on driver side
🔧 Tech 2 or aftermarket scan tool
⚠️ Requires transfer case fluid drain. Encoder motor relearn procedure required after installation.
Electronic Brake Control Module (EBCM)1.8 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Frame rail, driver side, forward of driver door near brake lines
🔧 Tech 2 or aftermarket scan tool
⚠️ Integrated with ABS hydraulic unit. Brake bleeding required after replacement. Automated bleed procedure recommended with scan tool.
Body Control Module (BCM)1.5 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Behind left side of instrument panel, above fuse block
🔧 Tech 2 with TIS2000/TIS2Web
⚠️ Controls lighting, door locks, remote keyless entry, retained accessory power. VIN programming and theft deterrent relearn required. All power accessories and options must be reconfigured.
📍 Integrated within BCM and ignition lock cylinder (Passlock system)
🔧 Tech 2 with TIS2000/TIS2Web
⚠️ Not a separate module; Passlock system integrated in BCM and ignition lock. Relearn required after BCM or ignition cylinder replacement.
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.
CERTAIN FEDERAL-MOGUL REPLACEMENT WHEEL HUB ASSEMBLIES WITH THE BRAND NAMES: NATIONAL, CARQUEST P/NOS. 515020, 515021, 515025, 515053, 515054, 515059, AND 515060, SHIPPED BETWEEN JANUARY 23, 2006, AND DECEMBER 20, 2007, SOLD FOR LIGHT DUTY AND MEDIUM DUTY TRUCKS. THE INBOARD RETENTION NUT USED TO MAINTAIN HUB BEARING ASSEMBLY CAN LOOSEN RESULTING IN AN ABS LIGHT INDICATION, NOISE, AND/OR WHEEL SEPARATION.
Consequence: WHEEL SEPARATION CAN RESULT IN A VEHICLE CRASH.
Remedy: FEDERAL-MOGUL WILL NOTIFY CUSTOMERS AND WILL REPLACE THE HUB ASSEMBLY FREE OF CHARGE. THE RECALL BEGAN ON FEBRUARY 7, 2008. OWNERS CAN CONTACT FEDERAL-MOGUL TOLL-FREE AT 877-489-6659.
FUEL SYSTEM, GASOLINE · 06E043000
2006-05-19
CERTAIN REPLACEMENT FUEL FILTERS, FRAM BRAND NAME P/N G3727, WITH DATE CODES X52911 THROUGH X60801 SEQUENTIALLY OR X600141 AND A MEXICO COUNTRY OR ORIGIN MARKING ON THE FUEL FILTER HOUSING MANUFACTURED FROM OCTOBER 18, 2005, THROUGH MARCH 21, 2006, SOLD FOR USE ON THE VEHICLES LISTED ABOVE AND ON CERTAIN SCHOOL BUSES. (TO SEE THE SCHOOL BUS ENGINE SIZES, CLICK ON "DOCUMENT SEARCH" AND THEN "BUS APPLICATIONS"). THE CONNECTOR ON THE FUEL FILTER WAS NOT MANUFACTURED TO HONEYWELL'S SPECIFICATION. AS A RESULT, THE O-RING MAY NOT SEAT CORRECTLY ON THE FUEL LINE.
Consequence: THIS CONDITION MAY CAUSE AN INADEQUATE SEAL AT THE CONNECTION, POTENTIALLY LEADING TO A FUEL LEAK. IN THE PRESENCE OF AN IGNITION SOURCE, A FIRE COULD OCCUR.
Remedy: HONEYWELL WILL NOTIFY OWNERS AND REPLACE THE FUEL FILTERS FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 18, 2006. OWNERS MAY CONTACT FRAM CUSTOMER SERVICE AT 1-800-890-2075 (OPTION 1).
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP · 05V379000
2005-08-29 · PE05020
CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES MAY EXPERIENCE UNWANTED ANTILOCK BRAKE SYSTEM (ABS) ACTIVATION. THIS CONDITION IS MORE LIKELY TO OCCUR IN ENVIRONMENTALLY CORROSIVE AREAS. THIS RECALL WILL BE LAUNCHED IN THE "SALT BELT" STATES OF CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, MARYLAND, MASSACHUSETTS, MAINE, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WEST VIRGINIA, WISCONSIN AND THE DISTRICT OF COLUMBIA ONLY.
Consequence: THIS CAN CAUSE INCREASED STOPPING DISTANCES DURING LOW-SPEED BRAKE APPLICATIONS, WHICH COULD RESULT IN A CRASH.
Remedy: DEALERS ARE TO REMOVE THE WHEEL SPEED SENSOR AND THOROUGHLY CLEAN THE WHEEL SPEED SENSOR MOUNTING SURFACE ON THE BEARING, APPLY RUST INHIBITOR TO THE CLEANED SURFACE, GREASE THE MOUNTING SURFACE, REINSTALL THE WHEEL SPEED SENSOR, AND CHECK THE PEAK-TO-PEAK OUTPUT VOLTAGE TO ENSURE THE WHEEL SPEED SIGNAL IS WITHIN SPECIFICATIONS. THE RECALL BEGAN SEPTEMBER 22, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 OR GMC AT 1-866-996-9463.
STRUCTURE · 03V094000
2003-03-07
CERTAIN PICKUP TRUCK, VAN, AND MINI VAN CONVERSIONS EQUIPPED WITH SOUTHERN COMFORT BUILT RUNNING BOARDS THAT CONTAIN CERTAIN COURTESY LIGHTS MANUFACTURED BY AMERICAN TECHNOLOGY COMPONENTS, INC. THESE UNITS CONTAIN A COURTESY LIGHT OR LIGHTS THAT MIGHT OVERHEAT WHEN THE WIRE HARNESS IS EXPOSED TO EXCESSIVE MOISTURE AND ROAD SALT.
Consequence: THIS OVERHEATING CONDITION CAN CAUSE THE RUNNING BOARD TO MELT OR CAUSE A FIRE.
Remedy: DEALERS WILL REPLACE THE WIRING HARNESS ON THESE RUNNING BOARDS. OWNER NOTIFICATION BEGAN MARCH 7, 2003. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT SOUTHERN COMFORT AT 1-800-745-6096.
SEATS:FRONT ASSEMBLY:HEAD RESTRAINT · 02V253000
2002-09-17
ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH REARWARD FOLDING HEAD RESTRAINTS ON THE SECOND ROW SEATS, TWO POTENTIAL PINCH POINTS EXIST ON EACH OF THE FOLDING HEAD RESTRAINTS WHEN THE RESTRAINTS ARE FOLDED REARWARD AS THE SEATBACK IS FOLDED DOWN.
Consequence: IF A PERSON WERE TO INSERT THEIR FINGER(S) INTO THE PINCH POINT WHEN THE HEAD RESTRAINT FOLDS, IT COULD TRAP AND PINCH THE FINGER(S) CAUSING INJURY.
Remedy: DEALERS WILL INSTALL PROTECTIVE COVERS OVER THE PINCH POINTS. OWNER NOTIFICATION BEGAN NOVEMBER 8, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020, GMC AT 1-800-462-8782, OR CADILLAC AT 1-800-458-8006.
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 2002 GMC Yukon XL 5.3L V8 Vortec and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.