GMT800 platform workhorse with solid bones but plagued by transmission cooling system failures, AFM/DOD lifter collapse on 5.3L engines, and intake manifold gasket leaks. The 6.0L is more reliable but less common.
Transmission Cooler Line / Radiator Failure Leading to Trans Destruction
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Pink milkshake in transmission pan (coolant/ATF mixture), Transmission slipping or no movement after radiator leak, Overheating transmission even with fresh fluid
Fix: The factory trans cooler inside the radiator fails, allowing coolant into the transmission. This destroys clutches and internals within miles. Prevention requires external trans cooler bypass before failure. After failure: full transmission rebuild or replacement plus radiator, flush all lines. 12-18 labor hours for full job.
Estimated cost: $2,800-4,500
AFM/DOD Lifter Collapse and Camshaft Wear (5.3L Only)
Common · high severity
Typical onset: 120,000-180,000 mi
Symptoms: Cold-start ticking or knocking that may persist when warm, Check engine light with P0300-series misfire codes, Loss of power, rough idle, dead cylinder
Fix: Active Fuel Management lifters fail, chew up camshaft lobes. Requires AFM delete kit with new camshaft, lifters, DOD valve delete, tune. Some techs replace just failed components but failure repeats. Full cam/lifter job is 16-20 hours with intake/valve covers off.
Estimated cost: $2,200-3,800
Intake Manifold Gasket Leak (Both Engines)
Common · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Coolant seepage at front or rear of intake manifold, Slow coolant loss with no external drips on ground, Rough idle or P0300 codes if coolant enters cylinders, White smoke on cold start in advanced cases
Fix: Composite gaskets deteriorate, leak coolant externally or internally. Requires intake manifold removal, gasket set, coolant flush. Often catch other issues while in there (injectors, plugs). 6-8 labor hours.
Estimated cost: $800-1,400
Front Differential Fluid Leak at Axle Seals or Pinion Seal
Common · low severity
Typical onset: 100,000+ mi
Symptoms: Gear oil drips on inner CV boot or differential housing, Whining noise from front end during turns if fluid gets low, Visible oil coating on front diff case
Fix: Axle seals go first, pinion seal less common but messier. Axle seal replacement is 2-3 hours per side with hub removal. Pinion seal adds driveshaft removal, pinion nut torque setup, 3-4 hours. Ignored long enough destroys front diff.
Estimated cost: $350-700
Steering Shaft U-Joint Clunk and Intermediate Shaft Failure
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunk or knock felt through steering wheel over bumps or turns, Intermittent binding or stiff steering at low speeds, Clunking noise from under dash area
Fix: Intermediate steering shaft U-joints wear out, collapse splines develop slop. Replacement shaft is straightforward but often misdiagnosed as rack or suspension. 1.5-2.5 labor hours.
Estimated cost: $300-550
Fuel Pump Failure and Sender Unit Issues
Occasional · medium severity
Typical onset: 120,000-180,000 mi
Symptoms: No start with crank, no fuel pressure, Stalling when fuel tank below 1/4 tank, Erratic or stuck fuel gauge, Whining noise from rear when key turns on
Fix: Factory pump fails or sender floats crack. Requires fuel tank drop, pump module replacement. Often see rusty straps and filler neck issues at same time on northern trucks. 3-4 labor hours for pump alone.
Estimated cost: $600-1,000
EVAP Vent Valve and Purge Solenoid Codes
Occasional · low severity
Typical onset: 80,000+ mi
Symptoms: Check engine light P0449, P0455, P0446 codes, Hard fuel tank cap removal (vacuum buildup), Fuel smell near rear axle area
Fix: Vent valve on top of fuel tank or purge solenoid near engine fail. Vent valve requires tank drop (see fuel pump), purge solenoid is 0.5 hour accessible from engine bay. Vent valve job is 3 hours, purge is quick.
Estimated cost: $200-650
Owner tips
Install external transmission cooler and bypass the factory radiator cooler BEFORE it fails — single best investment for longevity
Run full-synthetic oil and consider AFM disabler device on 5.3L engines if not already deleted
Inspect intake manifold for coolant weeping every oil change — catch it early before internal leak
Check front diff fluid level at every other oil change, these leak and owners ignore them until catastrophic
Use quality Dexron VI ATF only, change transmission fluid every 50k miles regardless of 'lifetime fill' claims
Buy the 6.0L or budget $3,000-5,000 in deferred maintenance for a 5.3L — excellent platform if you catch the trans cooler and AFM issues before they grenade.
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.
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.
CERTAIN TRUCKS AND SPORT UTILITY VEHICLES WERE BUILT WITH FUEL MODULE RESERVOIR ASSEMBLIES THAT CONTAIN FUEL PUMP WIRES CONNECTORS MAY OVERHEAT UNDER CERTAIN OPERATING CONDITIONS.
Consequence: IF THE IGNITION CIRCUIT WIRE IS EXPOSED, THE FUEL PUMP FUSE WILL BLOW, DISABLING THE FUEL PUMP AND CAUSING AN ENGINE STALL OR NO-START CONDITION. IF SUFFICIENT HEAT IS CONDUCTED TO THE PASS-THROUGH CONNECTOR, A HOLE IN THE CONNECTOR MAY RESULT, WHICH MAY CAUSE A 'SERVICE ENGINE SOON' LIGHT TO BE ILLUMINATED DURING THE EMISSION SYSTEM DIAGNOSTIC ROUTINE. FUEL VAPOR AND IN SOME CASES LIQUID FUEL MAY LEAK OUT OF THE FUEL TANK THROUGH THE HOLE IN THE CONNECTOR BODY. FUEL LEAKAGE, IN THE PRESENCE OF AN IGNITION SOURCE, COULD RESULT IN A FIRE. ALSO IF THE IGNITION CIRCUIT OR GROUND WIRE IS EXPOSED AND SHORTS TO THE FUEL LEVEL SENDER CARD WIRES, INACCURATE FUEL LEVEL READINGS MAY RESULT.
Remedy: DEALERS WILL REMOVE THE FUEL TANK, AND REMOVE THE MODULE RESERVOIR ASSEMBLIES FROM THE TANK, AND INSTALL A NEW SERVICE KIT FREE OF CHARGE. AN INTERIM LETTER TO OWNERS WAS MAILED ON MAY 25, 2005. THE OWNERS WERE RE-NOTIFIED ON OCTOBER 19, 2005, SINCE PARTS ARE NOW AVAILABE. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 AND GMC AT 1-866-996-9463.
POWER TRAIN:DRIVELINE:DRIVESHAFT · 05V005000
2005-01-07 · EA04012
SOME PICKUP TRUCKS, VANS, AND SPORT UTILITY VEHICLES EQUIPPED WITH A HYDRAULIC PUMP DRIVESHAFT THAT CAN FRACTURE, RESULTING IN IMMEDIATE LOSS OF HYDRAULIC POWER STEERING ASSIST. ON CERTAIN VEHICLES EQUIPPED WITH HYDRO-BOOST POWER BRAKES, THE SAME CONDITION CAN RESULT IN LOSS OF POWER ASSIST FOR BRAKING AFTER THE RESERVE PRESSURE IS DEPLETED.
Consequence: AN INOPERATIVE PUMP CAN CAUSE INCREASED STEERING EFFORT, AND IN HYDRO-BOOST EQUIPPED VEHICLES ALSO INCREASED BRAKING EFFORT, BUT DOES NOT COMPLETELY ELIMINATE THE ABILITY TO STEER OR SLOW THE VEHICLE.
Remedy: DEALERS WILL REPLACE THE HYDRAULIC PUMP. THE CAMPAIGN BEGAN ON FEBRUARY 14, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 OR GMC AT 1-866-996-9463.
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.
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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