The GM LCG is a 1,490 cc, turbocharged inline‑three petrol engine produced from 2019 onward. It features an aluminum block and head, dual overhead camshafts (DOHC), and direct fuel injection with variable valve timing on both intake and exhaust cams. This compact, lightweight unit delivers 137–155 hp and 162–174 lb‑ft of torque, balancing efficiency with responsive urban performance.
Fitted to models such as the Chevrolet Trailblazer and Buick Encore GX, the LCG was en…
All production years (2019–Present) meet U.S. Tier 3 Bin 30 standards (EPA Engine Family Code: 3GAXV01.5LBAK).
The GM LCG is a 1,490 cc turbocharged inline-three petrol engine engineered for subcompact SUVs (2019-Present). It combines direct injection with dual VVT to deliver strong low-RPM torque and efficient operation. Designed to meet U.S. Tier 3 Bin 30 standards, it prioritizes urban drivability and emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,490 cc | |
Fuel type | Petrol (Gasoline) | |
Configuration | Inline-3, DOHC, 12-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 74.0 mm × 86.6 mm | |
Power output | 137–155 hp (102–116 kW) | |
Torque | 162–174 lb-ft (220–236 Nm) | |
Fuel system | Direct injection (200 bar) | |
Emissions standard | U.S. Tier 3 Bin 30 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Single-scroll turbocharger | |
Timing system | Chain-driven camshafts | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 228 lb (103 kg) |
The GM LCG is used across GM's BEV2 platform for small SUVs with transverse mounting and no external licensing. This engine received minor application-specific calibrations-different ECU maps for the Trailblazer versus the Encore GX-but shares identical core hardware. All applications are documented in OEM technical bulletins.
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The LCG's primary reliability risk is high-pressure fuel pump cam follower wear, with elevated incidence in vehicles with irregular maintenance. GM internal data indicated a notable number of cases requiring pump or follower replacement under warranty, while owner reports cite hesitation and fuel trim codes as common symptoms. Strict adherence to Dexos1 Gen 2 oil and 7,500-mile change intervals makes preventative inspection and correct lubrication critical.
Analysis derived from GM technical bulletins (2019-2024) and NHTSA 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 LCG is a modern, efficient engine with a generally robust design. Its main documented issue is the high-pressure fuel pump cam follower, which GM has addressed with revised parts. With strict adherence to Dexos1 Gen 2 oil changes every 7,500 miles, the LCG is expected to be reliable for 150,000+ miles.
The most frequently reported issue is wear of the high-pressure fuel pump cam follower, causing hesitation and fuel pressure codes. Other common problems include GPF clogging from short trips, turbocharger wastegate rattle on early models, and minor oil leaks from the valve cover. These are covered in GM service bulletins.
The LCG 1.5L turbocharged three-cylinder is currently used in the Chevrolet Trailblazer and Buick Encore GX, both subcompact SUVs built on GM's BEV2 platform. It is the standard or optional engine across all trim levels for these models since their 2020 launch.
Aftermarket ECU tuning is common on the LCG platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Fuel economy is excellent for its class. In a front-wheel-drive Chevrolet Trailblazer, expect around 29 mpg city and 31 mpg highway. Real-world combined fuel economy typically falls between 28-30 mpg, making it one of the most efficient small SUVs available.
Yes. The GM LCG is an interference engine. This means if the timing chain were to fail or jump, the pistons will contact the valves, causing severe internal engine damage. Fortunately, the timing chain is designed to last the engine's lifetime with proper oil maintenance.
GM mandates Dexos1 Gen 2 full synthetic oil with a viscosity of SAE 0W-20 for the LCG engine. Using this specific oil is critical for protecting the turbocharger, high-pressure fuel pump, and emissions systems. Oil changes are recommended every 7,500 miles or 12 months.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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