2019 CHEVROLET COLORADO ZR2

Typical onset: 80,000-150,000 mi

Symptoms: Sudden loss of power or catastrophic engine knock, Metal shavings in oil, low oil pressure warnings, Piston skirt cracking leading to complete engine seizure, Check engine light with misfire codes before total failure

Fix: Complete engine rebuild or replacement required—pistons, rings, crankshaft, bearings, often heads if debris contaminated valvetrain. 25-35 labor hours for rebuild, 18-24 for short block swap. Root cause is weak piston skirt design and oiling system inadequacies under sustained load.

Estimated cost: $8,500-15,000

Typical onset: 60,000-100,000 mi

Symptoms: Transmission fluid pooling under vehicle, near front crossmember, Low transmission fluid warning or harsh shifting, Cooler line corrosion or crimp fitting failures at radiator tank connection

Fix: Replace transmission oil cooler lines and fittings, flush system, refill with Dexron VI. Sometimes requires radiator removal for access. 3-5 labor hours depending on rust and access.

Estimated cost: $450-850

Typical onset: 50,000-90,000 mi

Symptoms: Clunk or thud on hard acceleration or deceleration, Excessive driveline vibration, especially off-road or under load, Visible rubber separation or fluid leaking from hydraulic mount

Fix: Replace transmission mount—often the rear mount on ZR2 due to off-road stress. 1.5-2.5 labor hours, straightforward but requires trans support.

Estimated cost: $350-600

Typical onset: 40,000-80,000 mi

Symptoms: Hard starting, especially in cold weather or after sitting, Rough idle, loss of power, or stalling, Fuel in valley or visible wetness around filter housing, Air in fuel system requiring bleeding procedure

Fix: Replace fuel filter housing assembly and o-rings, bleed fuel system. Often caused by brittle seals or cracked housing from thermal cycling. 2-3 labor hours including bleed procedure.

Estimated cost: $400-700

Typical onset: 100,000-140,000 mi

Symptoms: Coolant loss with no visible external leaks, Sweet smell from exhaust or white smoke on cold start, Slight oil in coolant or coolant in oil (if severe)

Fix: Replace both head gaskets, resurface heads if warped, new head bolts, coolant flush. 12-16 labor hours—tight engine bay makes access difficult. Not epidemic like older GM V6s but happens.

Estimated cost: $2,800-4,200

Typical onset: 70,000-120,000 mi

Symptoms: Check engine light with P0401 or EGR flow codes, Loss of power, excessive black smoke, Coolant loss if EGR cooler fails internally, Rough idle and poor fuel economy

Fix: Clean or replace EGR cooler, often accompanied by EGR valve and intake cleaning. If cooler failed internally, coolant system flush required. 4-6 labor hours.

Estimated cost: $900-1,600