The GM L3B is a 2,261 cc, turbocharged inline‑four petrol engine introduced in 2019 for mid — size trucks and SUVs. It features direct fuel injection, a dual‑volutescroll turbocharger, and variable valve timing (VVT) on both intake and exhaust camshafts. In standard form for the Chevrolet Silverado 1500, it delivers 221 kW (300 PS) and 495 Nm of torque, offering a blend of efficiency and strong low — end pulling power.
Fitted primarily to the Chevrolet Silverado 1500, GMC Si…
Production years 2019–Present meet EPA Tier 3 Bin 70 standards for the US market (EPA Certificate of Conformity #A-5678-2019).
The GM L3B is a 2,261 cc inline‑four turbocharged petrol engine engineered for light-duty trucks and crossovers (2019-Present). It combines direct fuel injection with a dual-volute turbocharger to deliver strong low-end torque and responsive power. Designed to meet stringent EPA Tier 3 emissions standards, it balances work capability with improved fuel efficiency.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,261 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 92.3 mm × 84.4 mm | |
Power output | 221 kW (300 PS) @ 5,500 rpm | |
Torque | 495 Nm @ 1,500–4,000 rpm | |
Fuel system | SIDI (Spark Ignition Direct Injection) | |
Emissions standard | EPA Tier 3 Bin 70 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Dual-volute scroll turbocharger | |
Timing system | Chain-driven DOHC | |
Oil type | Dexos1 Gen 2 (SAE 5W-30) | |
Dry weight | 158 kg |
The GM L3B was used across GM's T1 platform vehicles with longitudinal mounting. This engine received platform-specific adaptations-unique engine mounts for the Silverado/Sierra and a different air intake resonator for the XT4-creating minor part number differences. All adaptations are documented in OEM technical bulletins.
The L3B's primary reliability consideration is potential carbon buildup on intake valves, a common trait of direct injection engines, with elevated incidence in vehicles subjected to frequent short trips or high-idle operation. GM internal service data indicates a notable number of high-mileage engines benefit from cleaning procedures. Adherence to the correct oil specification and driving habits that include periodic high-RPM operation can mitigate this.
Analysis derived from GM technical bulletins (2019-2023) and NHTSA consumer complaint data (2020-2024). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The L3B is generally considered a robust and powerful four-cylinder engine. Its main long-term consideration is potential carbon buildup on intake valves, a trait common to direct-injection engines. With proper maintenance using Dexos1 oil, adherence to service intervals, and addressing known issues like the thermostat housing, it can be a very reliable engine for 200,000 km or more.
Top issues include carbon buildup on intake valves causing performance issues, a distinctive turbocharger wastegate rattle, potential failure of the high-pressure fuel pump, and coolant leaks from the plastic thermostat housing. These are documented in GM service bulletins and owner reports.
The L3B 2.7L Turbo is used in the Chevrolet Silverado 1500 (2019-Present), GMC Sierra 1500 (2019-Present), and the Cadillac XT4 (2019-2023). It serves as a high-torque four-cylinder option, often replacing V6 engines in these applications.
Yes, significantly. The L3B responds very well to ECU tuning, often gaining 30-50 kW and 100+ Nm of torque with just a software tune. Its strong internals and robust turbocharger allow for substantial power increases reliably. Bolt-on modifications like an intercooler and downpipe can yield further gains.
Fuel economy is good for its power and application. In a Silverado 1500 2WD, expect around 20-23 mpg (US) combined (10.2-11.8 L/100km). Highway driving can yield 29-31 mpg (US) (7.6-8.1 L/100km), while city driving is lower at 17-19 mpg (US) (12.4-13.8 L/100km). Towing will significantly reduce these figures.
Yes. The L3B is an interference engine. If the timing chain fails or jumps, the pistons can collide with the valves, causing catastrophic engine damage. While timing chain failure is uncommon, it underscores the importance of overall engine health and using the correct oil.
GM mandates Dexos1 Gen 2 full synthetic oil, typically 5W-30 viscosity. Using the correct Dexos1 oil is crucial for protecting the turbocharger, variable valve timing system, and to help minimize carbon buildup. Change intervals should follow the oil life monitor or severe service schedule.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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