2014 CHEVROLET TAHOE

Typical onset: 80,000-150,000 mi

Symptoms: Ticking or tapping noise from engine at idle, especially when cold, Check engine light with misfire codes (P0300-P0308), Loss of power and rough running, Metal shavings in oil during changes

Fix: AFM system uses collapsible lifters on cylinders 1, 4, 6, and 7 to deactivate under light load. When lifters fail, they destroy cam lobes and send metal through the engine. Requires complete AFM lifter replacement, camshaft, often pushrods, and sometimes full engine rebuild if contamination is severe. 18-25 labor hours for in-chassis repair; 30+ hours for full rebuild.

Estimated cost: $3,500-8,500

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid leaking near radiator or under vehicle, Pink or red fluid dripping from front of vehicle, Transmission slipping or delayed engagement after leak develops, Coolant mixing with transmission fluid (strawberry milkshake appearance)

Fix: Steel cooler lines rust through where they connect to the radiator or along their routing. If internal cooler fails, coolant contaminates transmission fluid requiring transmission rebuild. External line failure needs immediate attention before transmission damage occurs. Replace both cooler lines preventively. 3-5 labor hours for lines only; add 15-20 hours if transmission contaminated.

Estimated cost: $800-1,200 (lines only), $3,500-5,000 (with transmission rebuild)

Typical onset: 60,000-100,000 mi

Symptoms: Vibration or shudder feeling at 40-50 mph during light acceleration, Feels like driving over rumble strips when converter locks up, Worsens when transmission fluid is hot, Usually happens in 5th or 6th gear under light throttle

Fix: Torque converter clutch material deteriorates causing shudder during lockup. Sometimes fluid and filter change with GM's Mobil 1 full synthetic ATF plus friction modifier additive temporarily helps, but most need converter replacement. 8-10 labor hours for converter R&R.

Estimated cost: $1,800-2,800

Typical onset: 90,000-140,000 mi

Symptoms: Ticking or tapping sound from engine that increases with RPM, Exhaust smell in cabin or under hood, Sound most noticeable on cold starts, Usually driver's side (left) manifold bolts fail first

Fix: Manifold bolts break due to heat cycling, creating exhaust leak between manifold and head. Requires manifold removal, drilling/extracting broken bolts, re-tapping threads if damaged. 4-6 labor hours per side. Left side easier access than right.

Estimated cost: $600-1,200 per side

Typical onset: 100,000-150,000 mi

Symptoms: Coolant leak from front center of engine, Whining or grinding noise from water pump pulley area, Engine overheating, Play in water pump pulley when wiggled by hand

Fix: Water pump bearing fails or seal leaks. These pumps are accessible but require removing serpentine belt, fan assembly, and pulley. Replace thermostat at same time. 3-4 labor hours.

Estimated cost: $500-800

Typical onset: 80,000-130,000 mi

Symptoms: A/C blows warm air, Sweet smell from vents, Windshield fogs up excessively, A/C system won't hold refrigerant charge

Fix: Evaporator core develops pinhole leaks. Major job because entire dash must be removed for access. 12-16 labor hours. Often combined with heater core and blend door actuator replacement while dash is out.

Estimated cost: $1,800-2,800

Typical onset: 120,000-180,000 mi

Symptoms: Power steering fluid leaking from rack boots or lines, Loose or vague steering feel, Groaning noise when turning at low speeds, Steering wheel doesn't return to center smoothly

Fix: Rack seals wear out, causing leaks and eventual loss of power assist. Rack replacement required. 4-5 labor hours. Replace hoses at same time if deteriorated.

Estimated cost: $900-1,500