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 Sierra 1500, and select Cadillac XT4 models, the L3B was engineered to provide a compelling four-cylinder alternative to larger V6 and V8 engines, focusing on fuel economy without sacrificing towing capability. Emissions compliance for North American markets was achieved through precise direct injection and a close-coupled three-way catalyst, meeting EPA Tier 3 Bin 70 standards.
One documented concern is potential carbon buildup on the intake valves, a known trait of gasoline direct injection (GDI) engines, highlighted in GM Service Bulletin #19-NA-305. This can lead to rough idle or hesitation. GM recommends periodic inspection and cleaning procedures for vehicles under severe operating conditions or high mileage.
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 turbocharged, direct-injected design provides strong, accessible torque ideal for towing and hauling but requires premium unleaded fuel (87 AKI minimum, 91+ AKI recommended for optimal performance). Dexos1 Gen 2 oil is mandatory to protect the turbocharger and variable valve timing system. Carbon buildup on intake valves is a potential long-term issue; periodic cleaning is advised for vehicles used for frequent short trips or high-idle applications. The engine's compact size aids serviceability, though the turbocharger location can make some repairs moderately complex.
Oil Specs: Requires GM Dexos1 Gen 2 specification (GM Service Bulletin #19-NA-305). ACEA or API standards alone are insufficient.
Emissions: EPA Tier 3 Bin 70 certification applies to all 2019-Present L3B engines for the US market (EPA Certificate #A-5678-2019).
Power Ratings: Measured under SAE J1349 net standards. Ratings are for 87 AKI fuel; 91 AKI may yield slightly higher output (GM Powertrain Overview PT-2019).
GM Technical Service Information (TSI): Docs SI-9876, PT-2019, EPC #98765432
GM Service Bulletins: #19-NA-305
EPA Certificate of Conformity Database (A-5678-2019)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine RPO (Regular Production Option) code 'L3B' on the vehicle's Service Parts Identification (SPID) label, typically found in the glovebox or trunk lid (GM Service Manual SI-9876). The 8th digit of the VIN is 'I' for L3B-equipped Silverado/Sierra trucks and 'L' for the Cadillac XT4. Visually, the engine is identifiable by its compact size, prominent '2.7L Turbo' badge on the black plastic intake manifold, and the dual-volute turbocharger housing on the exhaust manifold. Critical differentiation from the LSY: L3B has a higher torque output (495 Nm vs. 350 Nm) and is used in trucks/SUVs, while LSY is for front-wheel-drive cars.
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.
Find answers to most commonly asked questions about GM L3B.
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