2021 CHEVROLET SILVERADO 2500HD

Typical onset: 40,000-80,000 mi

Symptoms: excessive oil consumption (1 qt per 1,000 mi or worse), blue smoke on cold start, rough idle and misfires, metal shavings in oil, loss of compression on multiple cylinders

Fix: Complete engine rebuild or short block replacement required. We're seeing piston skirt scuffing and ring land failures, often cylinders 1, 3, 5, 7. Full tear-down, bore inspection, new pistons, rings, bearings, head gaskets. 25-35 labor hours depending on cab removal requirements and machine work.

Estimated cost: $8,000-14,000

Typical onset: 60,000-120,000 mi

Symptoms: transmission fluid leaking near radiator, pink fluid puddles under front of truck, transmission overheating warnings, slipping or delayed shifts under load

Fix: The steel cooler lines corrode at crimp joints and routing points, especially in salt states. Replace both feed and return lines, flush cooler, check for contamination in transmission. Sometimes requires radiator removal for access. 4-6 hours labor.

Estimated cost: $600-1,200

Typical onset: 50,000-90,000 mi

Symptoms: clunk when shifting from park to drive, vibration at highway speeds, driveline shudder under acceleration, visible sagging or cracked rubber in mount

Fix: The rear transmission mount fails prematurely, especially with heavy towing. Rubber separates from metal frame. Replace mount, inspect crossmember for cracks. 2-3 hours labor with proper lift access.

Estimated cost: $400-700

Symptoms: sudden loss of power, hard starting or no start, fuel in oil (dilution), metal contamination throughout fuel system

Fix: The CP4.2 high-pressure fuel pump can fail catastrophically, sending metal debris through entire fuel system. Requires pump, injectors, fuel rails, lines, tank cleaning, sometimes in-tank pump. This is a $8K-15K job. 20-30 hours labor. Most failures are from contaminated fuel, but some are internal pump defects.

Estimated cost: $8,000-15,000

Typical onset: 70,000-130,000 mi

Symptoms: check engine light with DEF system codes (P20EE, P20B9), reduced engine power mode, DEF warning messages, DEF freezing in cold weather

Fix: DEF tank heater elements fail, or quality sensors get crystallized deposits. Sometimes entire DEF tank assembly needs replacement if heater is integral. Clean/replace quality sensor first (1 hour, $150-300), but tank assembly runs 6-8 hours labor.

Estimated cost: $300-2,500

Typical onset: 60,000-100,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leaks, overheating under load, rough running, misfires, milky oil or oil in coolant

Fix: Often follows or accompanies the piston issues, but we've seen isolated head gasket failures on both banks. Requires head removal, resurfacing, new gaskets, ARP studs recommended. 18-24 hours labor for both sides.

Estimated cost: $4,500-7,000