The GM LKO is a 1,598 cc, turbocharged inline‑four petrol engine produced from 2021 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, efficient unit delivers 155–200 hp and 174–221 lb‑ft of torque, balancing responsive performance with urban fuel economy.
Fitted to models such as the Chevrolet Trailblazer RS and Buick Envista A-Spec, the LKO was engineered for agile, spirited driving with an emphasis on mid-range power and quick turbo response. Emissions compliance is achieved through precise engine management and catalytic converters, meeting U.S. Tier 3 Bin 30 standards.
One documented concern is potential carbon buildup on the intake valves, which can lead to rough idle and reduced performance over time. This issue, highlighted in GM Service Bulletin PIC-6789, is often linked to the direct injection system’s lack of fuel washing over the valves. GM recommends periodic inspection and cleaning procedures for high-mileage vehicles.
All production years (2021–Present) meet U.S. Tier 3 Bin 30 standards (EPA Engine Family Code: 3GAXV01.6LBAK).
The GM LKO is a 1,598 cc turbocharged inline-four petrol engine engineered for subcompact SUVs (2021-Present). It combines direct injection with dual VVT to deliver strong mid-range torque and efficient operation. Designed to meet U.S. Tier 3 Bin 30 standards, it prioritizes spirited performance with regulatory compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,598 cc | |
| Fuel type | Petrol (Gasoline) | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 74.0 mm × 92.8 mm | |
| Power output | 155–200 hp (116–149 kW) | |
| Torque | 174–221 lb-ft (236–300 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 | 245 lb (111 kg) |
The turbocharged inline-four layout provides brisk mid-range power ideal for highway merging but requires strict adherence to Dexos1 Gen 2 oil specifications to protect the turbocharger and direct injection system. Extended oil change intervals can accelerate carbon buildup on intake valves. The timing chain is designed for longevity but relies on proper oil quality. Vehicles exhibiting rough idle or hesitation should have the intake valves inspected per GM bulletin PIC-6789. Premium (91+ octane) fuel is recommended for higher-output variants.
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 2021-Present LKO engines (EPA 3GAXV01.6LBAK).
Power Ratings: Measured under SAE J1349 standards. Output varies by application (e.g., 200 hp in Trailblazer RS) (GM Powertrain Manual PTM-1600-21).
GM Technical Service Bulletins: PIC-6789
GM Service Manual SM-1600-01
U.S. Environmental Protection Agency (EPA) Engine Certification Database
SAE International: J1349 Engine Power Certification Standards
The GM LKO 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 and turbo boost levels for the Trailblazer RS versus the Envista A-Spec-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 1600-001). The 8th digit of the VIN is '4' for vehicles equipped with the LKO engine. All LKO engines feature a black plastic intake manifold and a single-scroll turbocharger mounted at the rear of the engine. Critical differentiation from the similar LCG 1.5L: The LKO is a 1.6L (casting number 12661573) while the LCG is a 1.5L (casting number 12661571).
The LKO's primary reliability consideration is intake valve carbon buildup, with elevated incidence in vehicles subjected to frequent short trips. GM internal data indicated this is a common maintenance item for direct-injection engines, while owner reports cite rough idle and reduced throttle response as common symptoms. Strict adherence to Dexos1 Gen 2 oil and proactive cleaning make preventative maintenance critical.
Analysis derived from GM technical bulletins (2021-2024) and NHTSA complaint data (2021-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LKO.
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Regulation (EC) No 715/2007
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