2011 CHEVROLET SILVERADO 2500HD

Typical onset: 100,000-180,000 mi

Symptoms: sudden loss of power and white smoke, metal shavings in fuel system, rough running or no-start after fuel starvation, complete engine seizure in worst cases

Fix: CP4 pump grenades internally, sending metal through the entire fuel system. Requires new pump, all eight injectors, fuel lines flushed or replaced, tank dropped and cleaned. If metal reached bearings, you're looking at short block or full engine rebuild. 20-40 hours labor depending on contamination extent.

Estimated cost: $8,000-18,000

Typical onset: 80,000-150,000 mi

Symptoms: white smoke from exhaust on cold start, repeated coolant loss with no external leaks, rough idle when warm, coolant in intake tract or EGR valve

Fix: EGR cooler cracks internally, dumping coolant into intake. Requires EGR cooler replacement, often EGR valve, intake cleaning, and coolant flush. If caught late, coolant ingestion can hydro-lock cylinders or crack pistons. 8-12 hours labor.

Estimated cost: $2,200-3,800

Typical onset: 70,000-120,000 mi

Symptoms: check engine light with reduced power mode, frequent active regen cycles, DEF quality or heater codes, exhaust brake not functioning

Fix: DPF clogs from short trips or failed regens. DEF heater and NOx sensors fail regularly. Cleaning DPF in place works temporarily; replacement is $1,500-2,000 for aftermarket. DEF heater and tank assembly runs 6-8 hours labor. Many owners delete emissions (off-road only) for $3,000-5,000.

Estimated cost: $800-4,500

Typical onset: 60,000-140,000 mi

Symptoms: transmission fluid spraying onto exhaust or ground, sudden loss of all gears, burning smell from undercarriage, transmission temp warning light

Fix: Factory cooler lines rot at frame mount points or chafe through. If you lose fluid while driving, internal clutches burn in seconds. Line replacement is straightforward (3-4 hours), but if clutches are toasted, you're into a $3,500-5,000 rebuild. Always replace both lines and upgrade mounts.

Estimated cost: $400-5,500

Typical onset: 80,000-150,000 mi

Symptoms: grinding or growling in 4WD, fluid leak from front output seal, difficulty shifting into 4WD, metal shavings on drain plug

Fix: Internal pump wears and rubs case bore, causing leaks and bearing failure. Seal replacement is Band-Aid; proper fix needs case boring and oversize seal kit or reman transfer case. 6-10 hours labor.

Estimated cost: $1,800-3,200

Typical onset: 120,000-200,000 mi

Symptoms: ticking or tapping from valve train, check engine light with misfire codes, loss of power on acceleration, metal in oil

Fix: Active Fuel Management lifters collapse, wiping cam lobes. Requires AFM delete kit, new lifters, camshaft, sometimes heads if rocker arms damaged. 18-25 hours labor. Many techs disable AFM preemptively with tuner ($500).

Estimated cost: $3,500-6,000

Typical onset: 90,000-150,000 mi

Symptoms: excessive play at center (more than 1 inch at wheel), wandering on highway requiring constant correction, clunking when turning from stop, groaning from pump on turns

Fix: Sector shaft wears in box, creating slop. Adjusting preload helps temporarily but wears faster. Reman box replacement is real fix. 2.5-3.5 hours labor. Alignment required after.

Estimated cost: $650-1,200