The GM LMQ is a 1,490 cc, inline‑three turbocharged petrol engine produced between 2021 and Present. It features gasoline direct injection, a single-scroll turbocharger, and dual overhead camshafts (DOHC), delivering 118 kW (158 PS) and 240 Nm of torque. Its compact three-cylinder design prioritizes fuel efficiency for urban environments while maintaining responsive acceleration.
Fitted to models such as the Chevrolet Trailblazer and Buick Encore GX, the LMQ was engineered for drivers seeking economical yet peppy performance in subcompact SUVs. Emissions compliance is achieved through a close-coupled three-way catalyst and advanced engine management, allowing compliance with stringent Euro 6d and U.S. Tier 3 Bin 30 standards across all markets.
One documented engineering focus is NVH (Noise, Vibration, Harshness) management inherent in three-cylinder layouts. GM Technical Service Bulletin #PIC-6543 addresses specific hydraulic engine mount calibration for certain 2022 builds to optimize cabin refinement. The design incorporates a balance shaft and acoustic treatments to mitigate vibrations.
All production years (2021–Present) meet Euro 6d and U.S. EPA Tier 3 Bin 30 standards (EPA Certificate of Conformity #A-RMY-21-LMQ-001).
The GM LMQ is a 1,490 cc inline‑three turbocharged petrol engine engineered for subcompact SUVs (2021-Present). It combines direct fuel injection with a single-scroll turbocharger to deliver responsive low-end torque and efficient highway cruising. Designed to meet global Euro 6d and U.S. Tier 3 standards, it balances performance with low emissions.
| 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 | 118 kW (158 PS) @ 5,500 rpm | |
| Torque | 240 Nm @ 2,000–4,000 rpm | |
| Fuel system | Direct Injection (200 bar) | |
| Emissions standard | Euro 6d / U.S. Tier 3 Bin 30 | |
| Compression ratio | 10.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single-scroll (Mitsubishi Heavy Industries) | |
| Timing system | Chain-driven | |
| Oil type | dexos1™ Gen 3 (SAE 0W-20) | |
| Dry weight | 99 kg |
The turbocharged three-cylinder provides peppy acceleration but requires adherence to 12,000 km or 12-month oil changes using dexos1™ Gen 3 (0W-20) to protect the turbocharger and direct injection system. Premium (91+ AKI) fuel is recommended for optimal performance and to prevent knocking under high load. The balance shaft design minimizes vibration; any unusual shaking should prompt inspection of engine mounts per GM TSB #PIC-6543. The high-pressure fuel pump and injectors demand clean, high-quality fuel to prevent clogging.
Oil Specs: Requires dexos1™ Gen 3 specification (GM Owner's Manual). ACEA C5 is not a direct substitute.
Emissions: Certified to Euro 6d and U.S. Tier 3 Bin 30 for all model years (EPA Certificate #A-RMY-21-LMQ-001).
Power Ratings: Measured under SAE J1349 standards. Peak output requires 91 AKI fuel (GM Service Information SI-21-301).
GM Global Engine EPC #GE-2021-LMQ
GM Powertrain Engineering Doc. #PTD-LMQ-01
EPA Certificate of Conformity #A-RMY-21-LMQ-001
GM Service Information Bulletins (SI-21-301, PIC-6543)
The GM LMQ was developed for GM's global VSS-F platform with transverse mounting. This engine features platform-specific adaptations-integrated exhaust manifold within the cylinder head for faster catalyst light-off-and no significant facelift revisions to date, ensuring broad parts interchangeability within its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code 'LMQ' stamped on a machined pad on the front of the cylinder block, below the exhaust manifold (GM SI Doc. EN-21-001). The 8th digit of the VIN is '5' for LMQ-equipped vehicles. Visually, the engine is identifiable by its compact three-cylinder layout, integrated exhaust manifold in the cylinder head, and 'ECOTEC' branding on the plastic engine cover. Critical differentiation from the 1.2L turbo: The LMQ has a larger displacement (1.5L vs 1.2L) and produces 158 PS vs 136 PS. Service parts are generally consistent across all model years; verify part numbers against the latest EPC as minor running changes may occur.
The LMQ's primary focus area is NVH management, with isolated reports of mount calibration issues in early 2022 builds. GM TSB #PIC-6543 addresses a specific calibration for mounts to optimize refinement. While generally robust, using incorrect oil or fuel can lead to long-term issues with the turbocharger or fuel system, making adherence to specifications critical.
Analysis derived from GM technical service bulletins (2021-2024) and NHTSA consumer complaint data (2021-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about GM LMQ.
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