2021 CHEVROLET S10

Typical onset: 60,000-90,000 mi

Symptoms: Ticking/tapping noise from engine on cold start that persists, Check engine light with misfire codes, Loss of power under load, Metal debris in oil

Fix: Requires cylinder head removal to replace all lifters and inspect camshaft lobes for wear; often the camshaft needs replacement too due to lobe scoring. 12-16 labor hours for lifters and cam, plus machine work if heads need resurfacing due to warpage from overheating episodes.

Estimated cost: $2,800-4,500

Typical onset: 50,000-80,000 mi

Symptoms: Clunking when shifting from park to drive or reverse, Excessive vibration at idle, Transmission 'drops' sensation during acceleration, Visible cracking or separation of rubber mount

Fix: The rubber isolators separate or tear, especially on trucks used for towing or rough terrain. Replacement is straightforward but requires supporting the transmission; 2-3 hours labor. Often need to replace multiple mounts simultaneously.

Estimated cost: $400-700

Typical onset: 80,000-120,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible leaks, Overheating under load, Milky oil or oil in coolant reservoir, Rough idle and loss of power

Fix: The Duramax head gasket can fail between cylinders or into coolant passages, often from overheating or inadequate coolant maintenance. Requires cylinder head removal, resurfacing (heads warp easily), and replacing head bolts. 14-18 hours labor plus machine shop time.

Estimated cost: $3,200-5,000

Typical onset: 70,000-100,000 mi

Symptoms: Transmission fluid dripping from front of vehicle, Low transmission fluid warnings, Transmission overheating, especially when towing, Pink fluid visible under truck

Fix: Cooler lines corrode or the cooler itself develops pinhole leaks, often accelerated by road salt or debris impact. Requires removing front bumper/grille assembly for access; 3-4 hours labor plus fluid flush.

Estimated cost: $600-1,100

Typical onset: 80,000-110,000 mi

Symptoms: Severe vibration at idle and acceleration, Squealing from serpentine belt area, Wobbling pulley visible during inspection, Check engine light with crankshaft position sensor codes

Fix: The rubber ring between the inner hub and outer ring deteriorates, causing the balancer to wobble or separate completely—can grenades the timing cover if it lets go. Replacement requires removing serpentine belt and accessories; 3-4 hours labor. Inspect immediately if vibration appears.

Estimated cost: $500-800

Symptoms: Hard starting, especially in cold weather, Loss of power under acceleration, Rough idle and engine stumbling, Check engine light with fuel pressure codes

Fix: The 2.8L Duramax is extremely sensitive to fuel quality—dirty diesel or water contamination clogs filters rapidly. Requires fuel filter replacement every 15,000-20,000 mi (more often with questionable fuel). If contaminated badly, entire fuel system needs flushing including injectors. Basic filter change: 1 hour; full system flush: 4-6 hours.

Estimated cost: $150-300 (filter only); $1,200-2,000 (system flush)