2022 CHEVROLET SILVERADO 2500HD

Typical onset: 30,000-80,000 mi

Symptoms: Sudden severe knocking from crankcase, Loss of oil pressure, Metal shavings in oil, Check engine light with low oil pressure codes, Complete engine seizure in worst cases

Fix: Spun rod bearings, damaged crankshaft journals, and wiped main bearings requiring complete short block replacement or full engine rebuild. This is catastrophic failure territory—15-25 hours labor depending on 2WD/4WD and cab configuration. GM extended warranty coverage on some VINs but not all.

Estimated cost: $12,000-18,000

Typical onset: 40,000-90,000 mi

Symptoms: Transmission fluid puddles under truck, Low trans fluid warnings, Transmission overheating under load, Pink fluid mixing with coolant in overflow tank, Burnt transmission fluid smell

Fix: The auxiliary transmission cooler lines corrode at fittings or the integrated cooler inside the radiator develops pinhole leaks allowing coolant/ATF mixing. Line replacement is 2-3 hours, but if the cooler contaminated the transmission, you're looking at fluid flush or full transmission service. If cooler is internal to radiator, radiator replacement adds 4-5 hours.

Estimated cost: $600-2,800

Typical onset: 50,000-100,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Excessive driveline vibration especially under load, Visible sagging or cracking of rubber mount, Transmission housing contacting crossmember

Fix: The rubber transmission mount tears or separates, particularly on trucks used for towing. Replacement requires supporting the transmission and unbolting the crossmember—about 2 hours labor. Check all mounts while you're under there because the rear differential mount often follows.

Estimated cost: $350-550

Typical onset: 60,000-120,000 mi

Symptoms: Hard starting especially in cold weather, Extended cranking before engine fires, Loss of power under acceleration, Fuel odor near filter housing, P0087 fuel rail pressure codes

Fix: The fuel filter housing develops cracks or the o-rings fail allowing air into the fuel system. Diesel systems are unforgiving about air intrusion—causes poor performance and hard starts. Replace housing assembly and prime system properly, about 1.5-2 hours. Don't just keep replacing filters—fix the housing.

Estimated cost: $400-700

Symptoms: DEF system warnings on dash, Engine derate or reduced power mode, Won't restart after shutdown, Poor DEF fluid quality message, Freeze-related failures in cold climates

Fix: DEF tank heater elements fail or contaminated DEF crystallizes in lines and injector. Contamination requires full system flush, tank replacement, and new injector—8-12 hours labor. Preventive: use only fresh DEF, don't let it sit for months. Once you're in derate mode, you have limited miles before shutdown.

Estimated cost: $2,500-5,000

Typical onset: 60,000-100,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Overheating under load, Rough idle and misfires, Oil looks milky or coolant looks oily

Fix: Related to the L8T's known bottom-end issues—some trucks blow head gaskets before grenading internals. Both heads requires 18-22 hours labor, and you should pressure-test and deck-surface the heads. If you're this deep, seriously consider whether a shortblock or reman engine makes more sense.

Estimated cost: $4,500-7,000