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 engineered for agile, fuel-efficient city driving with an emphasis on low-end torque and smooth power delivery. Emissions compliance is achieved through gasoline particulate filters (GPF) and precise engine management, meeting U.S. Tier 3 Bin 30 standards.
One documented concern is premature wear of the high-pressure fuel pump cam follower, which can lead to reduced fuel pressure and engine performance issues. This issue, highlighted in GM Service Bulletin PIC-6542, is often linked to lubrication quality or assembly tolerances. GM has issued revised service procedures and parts for affected vehicles.
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 | Dexos1 Gen 2 (SAE 0W-20) | |
| Dry weight | 228 lb (103 kg) |
The turbocharged inline-three layout provides brisk low-end torque ideal for city driving but demands strict adherence to Dexos1 Gen 2 oil specifications to protect the high-pressure fuel pump and turbocharger. Extended oil change intervals or incorrect oil can accelerate cam follower wear. The timing chain is designed for the engine's life but relies on proper oil quality. Spark plug access is straightforward. Vehicles exhibiting fuel pressure-related codes or hesitation should have the cam follower inspected per GM bulletin PIC-6542.
Oil Specs: Requires Dexos1 Gen 2 specification (GM Owner's Manual). SAE 0W-20 viscosity is mandatory for warranty compliance.
Emissions: Tier 3 Bin 30 certification applies to all 2019-Present LCG engines (EPA 3GAXV01.5LBAK).
Power Ratings: Measured under SAE J1349 standards. Output varies by application (e.g., 155 hp in Trailblazer RS) (GM Powertrain Manual PTM-1500-19).
GM Technical Service Bulletins: PIC-6542
GM Service Manual SM-1500-01
U.S. Environmental Protection Agency (EPA) Engine Certification Database
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped on a flat pad on the front of the engine block, near the alternator (GM TIS 1500-001). The 8th digit of the VIN is '3' for vehicles equipped with the LCG engine. All LCG engines feature a black plastic intake manifold and a single-scroll turbocharger mounted at the rear of the engine. Critical differentiation from the similar LYX 1.5L: The LCG is a 3-cylinder (casting number 12661571) while the LYX is a 4-cylinder (casting number 12661572).
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.
Find answers to most commonly asked questions about GM LCG.
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GOV.UK: Vehicle Approval & V5C
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DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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