The 2000 GMT800 Yukon is a body-on-frame workhorse that runs forever if maintained, but three major areas bite hard: transmission cooler failures that grenade the 4L60E/4L65E, intake manifold gasket leaks on the Vortec V8s, and fuel system failures that strand you. The 5.3L is generally more reliable than the 4.8L.
Transmission Oil Cooler Line Failure → Catastrophic Transmission Damage
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Pink or milky fluid in radiator overflow tank (coolant contaminated with ATF), Transmission slipping, delayed engagement, or no movement, Overheating transmission temp gauge, Strawberry milkshake appearance when checking trans fluid
Fix: The cooler lines corrode where they connect to the radiator, allowing coolant and ATF to mix. This destroys the transmission internals within days. Requires full transmission rebuild or replacement (8-12 hours), new radiator (2 hours), all cooler lines, and complete fluid flush. Preventive fix is external trans cooler install before failure.
Estimated cost: $2,800-4,500
Intake Manifold Gasket Failure (Vortec V8)
Common · medium severity
Typical onset: 60,000-120,000 mi
Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Rough idle, misfires on multiple cylinders, Coolant in oil (milky dipstick) in severe cases, DexCool residue visible around intake ports
Fix: The plastic composite intake gaskets deteriorate from heat cycling and DexCool interaction. Coolant seeps into crankcase or cylinders. Requires intake manifold removal, new gaskets, and often spark plug replacement (6-8 hours labor). Use updated Fel-Pro gaskets, not OEM.
Estimated cost: $800-1,400
Fuel Pump Failure
Common · high severity
Typical onset: 100,000-180,000 mi
Symptoms: No-start or crank/no-fire condition, Engine dies while driving, restarts after cooling, Hesitation or stumble under acceleration, Whining noise from fuel tank area, Fuel pressure below 55-62 PSI spec
Fix: The in-tank pump assembly fails from wear and contamination. Requires dropping the 26-30 gallon tank (3-4 hours labor). Replace entire pump module, not just the pump. The fuel filter is integral to the module on these — no separate inline filter like older models. Use AC Delco unit.
Estimated cost: $600-1,000
4L60E/4L65E Transmission Internal Failure
Occasional · high severity
Typical onset: 120,000-200,000 mi
Symptoms: Slipping between 1st and 2nd gear, No 3rd or 4th gear (stuck in lower gear), Harsh or delayed shifts, Metal shavings in pan during fluid change, P0730 or P0741 codes
Fix: Even without cooler contamination, these transmissions wear out clutch packs, bands, and the notorious 3-4 clutch pack. Towing and heavy loads accelerate wear. Requires rebuild with upgraded Alto or Raybestos clutches and Sonnax components (10-14 hours labor), or remanufactured unit swap.
Estimated cost: $2,200-3,800
EVAP Vent Solenoid and Fuel Tank Pressure Sensor Failure
Occasional · low severity
Typical onset: 80,000-140,000 mi
Symptoms: Check Engine Light with P0440, P0442, P0446 codes, Failed emissions test, Hissing when opening fuel cap, Difficulty fueling (pump clicks off repeatedly), Fuel smell around vehicle
Fix: The vent valve solenoid on top of the tank and the FTP sensor fail from heat and age. Requires tank drop (3 hours) to access components. Often combined with fuel pump replacement to save labor.
Estimated cost: $400-700
Distributor Failure (4.8L engines primarily)
Occasional · high severity
Typical onset: 90,000-150,000 mi
Symptoms: No-start condition, engine cranks but won't fire, Random stalling while driving, Tachometer drops to zero then engine dies, P0336 code (crankshaft position sensor correlation), Ignition timing erratic or impossible to set
Fix: The optical sensor inside the distributor fails. Some techs try just the sensor (2 hours), but the entire distributor assembly usually needs replacement to avoid comebacks. 5.3L uses different ignition system and rarely has this issue.
Estimated cost: $350-650
Front Differential Actuator and Transfer Case Encoder Motor Failure (4WD models)
Occasional · medium severity
Typical onset: 70,000-130,000 mi
Symptoms: Service 4WD message on dash, Unable to engage 4WD, or stuck in 4WD, Grinding or clunking when shifting transfer case modes, Blinking 4WD indicator lights, Front wheels don't engage in 4WD
Fix: The thermal actuator on the front axle fails, or the encoder motor on the transfer case stops communicating position. Actuator replacement is 1.5 hours, encoder motor is 2-3 hours. Both are common, often misdiagnosed. Test with Tech2 scanner before throwing parts.
Estimated cost: $300-800
Owner tips
Install an external transmission cooler BEFORE the factory cooler fails — $200 investment saves $3,500 rebuild
Change transmission fluid every 50k miles with Dexron VI, not Dexron III
Replace intake gaskets proactively at 100k miles if still original — catches them before coolant damage occurs
Keep fuel tank above 1/4 full to prolong pump life — these pumps use fuel for cooling
Use Top Tier gas and add fuel system cleaner every 5k miles — injectors clog easily on these
Check for transmission cooler line rust annually starting at 80k miles
Buy one under 100k miles with documented transmission service and fresh intake gaskets, or plan $4,000 in catch-up repairs — but maintained examples routinely hit 300k 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.
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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.
AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE-INACTIVE · 02V178000
2002-07-01
ON CERTAIN PICKUP AND UTILITY TRUCKS, SOME OF THESE VEHICLES HAVE AN AIR BAG SENSING DIAGNOSTIC MODULE (SDM) WHICH CONTAINS AN ANOMALY THAT COULD RESULT IN THE DRIVER AND PASSENGER'S AIR BAG FAILING TO DEPLOY DURING CERTAIN FRONTAL CRASHES.
Consequence: IN A VEHICLE CRASH, FRONT SEAT OCCUPANTS MAY RECEIVE MORE SEVERE INJURIES.
Remedy: DEALERS WILL RECALIBRATE THE SDM ON THE AFFECTED VEHICLES. OWNER NOTIFICATION BEGAN AUGUST 28, 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 OR GMC AT 1-800-462-8782.
TIRES:TREAD/BELT · 01T001000
2001-01-02
TIRE DESCRIPTION: WILDERNESS LE TIRES (BOTH BLACK AND RAISED WHITE LETTER TIRES) PRODUCED DURING THE WEEK OF APRIL 24, 2000 (THE SEVENTEENTH WEEK OF 2000) AT THE CUERNAVACA, MEXICO PLANT WITH TIRE SERIAL NUMBERS V672WL11700 (BLACKWALL) AND V672WL21700 (RAISED WHITE LETTERS). THESE TIRES WERE USED AS ORIGINAL EQUIPMENT ON MODEL YEAR 2000 YUKON XL 1500 SERIES VEHICLES AND WERE ALSO OFFERED AS OPTIONAL EQUIPMENT ON THE 2000 CHEVROLET SUBURBAN 1500 SERIES VEHICLES. TREAD SEPARATION CAN OCCUR DUE TO A LACK OF ADHESION TO THE FIRST STEEL BELT.
Consequence: TREAD BELT SEPARATION MAY BE NOTICED BY IRREGULAR WEAR, NOISE, OR VIBRATION. WITH CONTINUED USE, IT MAY LEAD TO COMPLETE SEPARATION OF THE TREAD/BELT PACKAGE FROM THE TIRE CARCASS, POSSIBLY RESULTING IN A VEHICLE CRASH, PERSONAL INJURY, OR DEATH.
Remedy: ON JANUARY 2, 2001, FIRESTONE MADE A PUBLIC ANNOUNCEMENT OF THE DEFECT AND THAT REPLACEMENT TIRES ARE IMMEDIATELY AVAILABLE AT NO COST TO THE CUSTOMER. REPLACEMENT TIRES ARE AVAILABLE AT EITHER THEIR LOCAL GM OR CHEVROLET DEALER OR BY THEIR LOCAL AUTHORIZED PARTICIPATING FIRESTONE RETAILER. OWNER NOTIFICATION BEGAN JANUARY 1, 2001. OWNERS SHOULD CONTACT FIRESTONE AT 1-800-465-1904.
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS · 00V345000
2000-10-30
VEHICLE DESCRIPTION: LIGHT DUTY PICKUP TRUCKS AND SPORT UTILITY VEHICLES. SOME OF THESE VEHICLES HAVE A CLEARANCE CONDITION BETWEEN THE FRONT RIGHT-HAND BRAKE PIPE AND THE BODY CROSS SILL THAT COULD DECREASE TO THE POINT OF ALLOWING CONTACT DURING THE LIFE OF THE VEHICLE. IF CONTACT OCCURS AND THE BRAKE PIPE BECOMES DAMAGED, IN HALF OF THE BRAKE SYSTEM THERE CAN BE A LOSS OF BRAKE FLUID AND PRESSURE. THE BRAKE WARNING LAMP WILL BE ACTIVATED WHEN THE BRAKE FLUID LEVEL REACHES THE INDICATOR LIMIT.
Consequence: DURING BRAKING, THE PEDAL WILL BE LOWER THAN NORMAL AND STOPPING DISTANCES WILL BE LONGER. IF THIS OCCURS WHEN STOPPING DISTANCE IS LIMITED, A CRASH COULD OCCUR.
Remedy: DEALERS WILL INSPECT THE FRONT RIGHT-HAND BRAKE PIPE FOR WEAR. IF THERE ARE SIGNS OF WEAR, THIS SECTION OF THE BRAKE PIPE WILL BE REPLACED WITH A NEW DESIGNED BRAKE PIPE SECTION. IF THERE ARE NOT SIGNS OF WEAR ON THE BRAKE PIPE, THE DEALER WILL INSTALL A SPACER CLIP TO ENSURE SUFFICIENT CLEARANCE BETWEEN THE BRAKE PIPE AND THE BODY CROSS SILL.
STRUCTURE:BODY · 00V343000
2000-10-25
VEHICLE DESCRIPTION: LIGHT DUTY PICKUP TRUCKS AND SPORT UTILITY VEHICLES. SOME OF THESE VEHICLES HAVE LOOSE OR MISSING REAR WHEELHOUSE PLUGS. UNDER CERTAIN VEHICLE OPERATING CONDITIONS, EXHAUST GASES CAN FLOW FORWARD AND ACCUMULATE IN THE REAR WHEELHOUSE.
Consequence: THESE GASES COULD FLOW INTO THE PASSENGER COMPARTMENT IF THE PLUG IS MISSING OR LOOSE AND COULD CAUSE POSSIBLE ILLNESS, UNCONSCIOUSNESS, OR DEATH.
Remedy: DEALERS WILL INSPECT THE VEHICLE FOR LOOSE OR MISSING WHEELHOUSE PLUGS AND INSTALL NEW PLUGS IF NECESSARY.
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