Chevrolet Colorado GMT31T0

2.7L turbo four, aluminum block, direct injection only — GM's answer to Ford's EcoBoost. 310 hp, 400 lb-ft from 1,500 rpm. Feels like a small V8 until the revs climb and the four-cylinder character shows. Head gasket failures on 2019-2022 early production under 25k miles, warranty-covered. A fleet of 750+ trucks at 50-80k miles with zero engine failures suggests the 2022+ builds are sorted.

• !! Head Gasket on Early Models (2019-2022) from 30,000 km

  Head gasket fails on early L3B under 25k miles. Covered under warranty.

  Symptoms: White smoke, overheating, milky oil
  1,500–4,000 $
  Ad head gasket L3B 2.7 turbo Silveradooil cooler block gasket L3B 2.7
• !! Turbo Bearing Wear from 80,000 km

  Poor oil quality or extended intervals destroy turbo bearings.

  Symptoms: Turbo lag, whine, blue smoke, power loss
  1,500–4,000 $
  Ad 12701386 turbocharger assembly L3B 2.7T12716475 wastegate actuator L3B
• !! Injector failure (ECM update available 2019-2022) from 80,000 km

  Fuel injectors wear or fail — incorrect ECM programming (2019-2022) causes wrong injection quantity. Service Update N242450631 available as free fix.

  Symptoms: Rough idle, misfires, poor fuel economy, check engine light
  300–600 $
  Ad 12688000 high pressure fuel pump L3B 2.7THPFP direct injection pump Silverado 2.7

+ 2 more engine weaknesses + vehicle weaknesses

2.7L turbo four, detuned version of the L3B. 237 hp and 259 lb-ft — the base Colorado engine. Lower thermal stress than the 310 hp tune means longer projected lifespan. Same direct-injection carbon buildup risk. An honest four-cylinder truck motor.

• ! Direct Injection Carbon Buildup (L2R) from 100,000 km

  Same direct-injection-only design as the L3B means carbon accumulates on intake valves. Lower stress levels extend time vs. the 310 hp tune. Walnut blasting recommended every 100k miles.

  Symptoms: Extended cranking, rough idle, misfires at cold temps
  400–1,200 $
  Ad intake valve cleaning 2.7 turbo L2R