Why is the GM 2.7 Turbo L3B simultaneously praised as a torque monster that can replace V6 and V8 engines — yet questioned by truck purists who refuse to trust a four-cylinder in a full-size pickup? The answer lies in a remarkable engineering story where advanced technology meets the brutal reality of daily truck use.
The GM L3B engine is a turbocharged 2.7-liter inline-four that debuted in the 2019 Chevrolet Silverado 1500 and GMC Sierra 1500, producing 310 horsepower and 348 lb-ft of torque. Assembled at GM’s Spring Hill plant in Tennessee, the L3B replaced three outgoing engines: the 3.6L V6 LGX, 3.6L V6 LGZ, and 4.3L V6 LV3. For the 2022 model year, GM upgraded the L3B engine to deliver an impressive 430 lb-ft of torque — earning it the TurboMax branding starting in 2024.12
Since its introduction, the L3B has been installed in over 15 vehicle applications across Chevrolet, GMC, and Cadillac lineups, including full-size and mid-size trucks, sport sedans, and SUVs. Despite early skepticism, the L3B engine has proven to be a generally reliable workhorse, with some owners reporting 290,000+ km (180,000+ miles) of trouble-free operation.34
- 📋 Three Real Owner Case Studies
- 1️⃣ Technical Specifications
- 2️⃣ The 4 Critical L3B Problems
- 3️⃣ L3B Reliability & Longevity
- 4️⃣ L3B Tuning & Performance Modifications
- 5️⃣ L3B Buying Guide
-
6️⃣ L3B FAQ
- What is the average repair cost for the L3B engine?
- How many miles can I expect from an L3B engine?
- Is the L3B reliable for daily driving?
- What oil should I use in the L3B for longevity?
- Is it worth buying a used truck with the L3B?
- What are the most common L3B problems?
- How much does L3B tuning cost?
- What is the towing capacity with the L3B 2.7L Turbo?
- Does the L3B require premium fuel?
- Can you disable AFM on the L3B?
- References
📋 Three Real Owner Case Studies
CASE 1: 2022 Chevrolet Silverado 1500 LTD — 96,000 miles
- Driving conditions: Mixed city/highway, Midwest climate
- Issue: Oil consumption of 1–1.5 quarts per 5,000 miles
- Resolution: Owner switched to high-mileage oil, changed oil at 30% OLM (~5,000 mi)
- Cost: ~$50 USD per oil change (DIY); engine still running strong
CASE 2: 2021 Chevrolet Silverado 1500 4x4 — 82,000 miles
- Driving conditions: Highway-dominant, moderate towing
- Issue: Camshaft failure requiring replacement
- Resolution: Camshaft and valve train components replaced at dealer
- Cost: ~$2,500–$3,500 USD (dealer repair under extended warranty)
CASE 3: 2019 Fleet Chevrolet Silverado 1500 — 290,000 km (180,000 miles)
- Driving conditions: Heavy commercial use, multiple drivers
- Issue: No major engine problems; cosmetic and switch wear only
- Resolution: No engine repairs needed
- Cost: $0 USD for engine-specific repairs
1️⃣ Technical Specifications
Engine Architecture & Design
The GM 2.7 Turbo L3B is a clean-sheet design — not derived from any existing GM engine family. It is part of GM’s Cylinder Set Strategy (CSS), a modular approach that shares design principles across engine families while allowing purpose-built optimization.2
Key architectural features of the L3B engine:
- Undersquare bore/stroke ratio (92.25 mm × 102 mm / 3.63″ × 4.01″) — the long stroke generates strong low-end torque, delivering diesel-like pulling power5
- Offset crankshaft — slightly off-center of the cylinders, reducing piston side-loading friction caused by the long stroke2
- Forged steel crankshaft and connecting rods — built to withstand turbo cylinder pressures far beyond typical gasoline four-cylinders1
- Aluminum alloy pistons with cast iron ring groove inserts — heat-resistant under sustained boost2
- Spun nodular iron cylinder liners — superior wear resistance vs. aluminum bores1
- Integrated exhaust manifold cast directly into the aluminum cylinder head — shortens exhaust gas path to the turbo, improving spool-up and thermal efficiency6
The block and head are both cast aluminum (380 T5 block, 356 T5 head), keeping the L3B engine weight at approximately 165 kg (364 lbs) — significantly lighter than the 5.3L V8 it often replaces. Parts are cast at Bedford Casting Operations in Indiana and assembled in Spring Hill, Tennessee.71
⚙️ Full L3B Specifications Table
| Parameter | Specification |
|---|---|
| RPO Code | L3B (High Output) / L2R (Detuned, discontinued 2024) |
| Configuration | Inline 4-cylinder, DOHC, 16-valve |
| Displacement | 2,727 cc / 166.4 cu. in. (2.7L) |
| Bore × Stroke | 92.25 mm × 102 mm (3.63″ × 4.01″) |
| Compression Ratio | 10.0:1 |
| Block Material | 380 T5 Cast Aluminum |
| Cylinder Head Material | 356 T5 Cast Aluminum |
| Cylinder Liners | Spun Nodular Iron |
| Crankshaft | Forged Steel, Offset Design |
| Connecting Rods | Forged Steel |
| Firing Order | 1-3-4-2 |
| Turbocharger | BorgWarner Dual-Volute, Electronic Wastegate |
| Max Boost Pressure | 27 psi / 1.9 bar (High Output); 20 psi (Mid); 10 psi (WT) |
| Fuel Delivery | High-Pressure Direct Injection (3,000 PSI / 20 MPa) |
| Valvetrain | TriPower — Variable Lift, Duration, AFM Cylinder Deactivation |
| Oil Capacity | 5.7 liters (~6 quarts) |
| Recommended Oil | 5W-30 Full Synthetic, Dexos1 Gen 2 |
| Recommended Fuel | Regular Unleaded (87 octane) |
| Weight | 165 kg (364 lbs) |
| Assembly Location | GM Spring Hill, Tennessee, USA |
Performance Specifications by Application
| Vehicle | Years | Power | Torque | Transmission |
|---|---|---|---|---|
| Silverado / Sierra 1500 | 2019–2021 | 310 hp @ 5,600 rpm | 348 lb-ft @ 1,500 rpm | 8-Speed Auto |
| Silverado / Sierra 1500 TurboMax | 2022–2026 | 310 hp @ 5,600 rpm | 430 lb-ft @ 3,000 rpm | 8-Speed Auto |
| Cadillac CT4 Premium Luxury | 2020–2025 | 310 hp @ 5,500 rpm | 350 lb-ft @ 1,500 rpm | 10-Speed Auto |
| Cadillac CT4-V | 2020–2025 | 325 hp @ 5,500 rpm | 380 lb-ft @ 2,000 rpm | 10-Speed Auto |
| Colorado / Canyon TurboMax | 2023–present | 310 hp @ 5,600 rpm | 430 lb-ft @ 3,000 rpm | 8-Speed Auto |
| L2R Work Truck (Colorado) | 2023–2024 | 237 hp @ 5,600 rpm | 259 lb-ft @ 3,000 rpm | 8-Speed Auto |
| Tahoe / Yukon (China only) | 2024–present | 300 hp @ 5,500 rpm | 369 lb-ft @ 2,000 rpm | 10-Speed Auto |
📊 L3B Fuel Economy & Towing Capacity
EPA Fuel Economy (2025 Silverado 1500 TurboMax):
| Configuration | City | Highway | Combined |
|---|---|---|---|
| 2WD | 18 MPG | 22 MPG | 20 MPG |
| 4WD | 17 MPG | 20 MPG | 18 MPG |
| Real-world average | 15–17 MPG | 19–24 MPG | 17–20 MPG |
⚠️ Car and Driver testing at 75 mph showed the L3B engine returning 18 MPG — actually worse than the 5.3L V8 (21 MPG) at sustained highway speeds. The turbo four performs best in mixed driving where cylinder deactivation and stop/start provide their greatest benefit.8
Towing & Payload (2025 Silverado 1500 with L3B):
| Configuration | Max Towing (lbs) | Max Payload (lbs) |
|---|---|---|
| Crew Cab 2WD | 9,200 | 2,280 |
| 2WD with Max Trailering (NHT) | 11,300 | 2,100 |
| Crew Cab 4WD | 9,000 | 2,160 |
| 4WD with Max Trailering (NHT) | 11,000 | 1,980 |
Technical Innovations of the L3B
- TriPower Valvetrain — 3 cam profiles (high lift, low lift, AFM deactivation) electromagnetically actuated for real-time optimization2
- Active Thermal Management — electric water pump + 3-way rotary coolant valve for faster warm-up and targeted cooling2
- Dual-Volute Turbocharger — concentric exhaust passages (not side-by-side) leverage exhaust pulse energy for faster spool and reduced lag1
- Continuously Variable Oil Pump — adjusts displacement based on engine speed/load, reducing parasitic losses2
- Piston Oil Jets — spray cooling oil onto piston undersides for durability under sustained boost2
⚔️ L3B Competitor Comparison
| Feature | GM 2.7L L3B | Ford 2.7L V6 EcoBoost | Toyota i-FORCE 2.4T |
|---|---|---|---|
| Configuration | I4 Single Turbo | V6 Twin Turbo | I4 Twin-Scroll Turbo |
| Power | 310 hp | 325 hp | 278 hp |
| Torque | 430 lb-ft | 400 lb-ft | 317 lb-ft |
| Fuel Injection | Direct Only | Port + Direct | Port + Direct |
| Carbon Buildup Risk | ⚠️ Higher | ✅ Lower | ✅ Lower |
2️⃣ The 4 Critical L3B Problems
Problem #1: Active Fuel Management (AFM) System Failure
Problem Description & Frequency:
The AFM system deactivates the middle two cylinders under light load to improve fuel economy. It relies on oil-pressure-actuated lifters and electromagnetic solenoids. Over time, these L3B lifters experience premature wear, solenoid failure, or contamination from degraded oil. A class-action lawsuit was filed against GM alleging AFM lifter failures. On the L3B engine specifically, AFM failures are less frequent than V8 engines but documented, particularly after 60,000–100,000 miles.124
⚠️ Symptoms:
- ⚠️ Excessive oil consumption (1+ quart per 3,000 miles)
- ⚠️ Sudden power loss or hesitant acceleration
- ⚠️ Rough idle or engine stalling
- ⚠️ Check engine light with AFM-related DTCs
- ⚠️ Difficulty downshifting
Root Cause: The lifters operate in narrow oil passages sensitive to contamination. Extended oil change intervals, degraded oil, or debris foul the lifter mechanisms. Failed solenoids prevent proper cylinder reactivation, causing L3B misfires and oil consumption.12
Real Owner Examples:
- “2022 Silverado, shuddering between 25–45 mph. Consensus points to AFM.” — Reddit r/Silverado13
- “2020 Silverado, 48,000 miles — roller rockers on cylinder 3 fell apart, took out the camshafts.” — ChevyTrucks.org4
L3B AFM Repair Options & Costs:
| Repair | Cost (USD) | Notes |
|---|---|---|
| AFM solenoid replacement | $200–$500 | Dealer labor + parts |
| AFM lifter replacement (full set) | $1,500–$3,000 | Requires valve cover removal |
| AFM delete kit (lifters + tune) | $1,200–$2,500 | Eliminates AFM permanently |
| AFM disabler device | $100–$200 | Plug-in; keeps AFM off |
| HP Tuners AFM software disable | $300–$600 | ECU flash |
🔧 Prevention: Change oil every 5,000 miles with Dexos1 Gen 2 5W-30 synthetic. Consider an AFM disabler for city driving.4
Problem #2: Carbon Buildup on Intake Valves
Problem Description & Frequency:
Like all direct-injection-only engines, the L3B is prone to carbon accumulation on intake valves. Unlike dual-injection engines (Ford EcoBoost, Toyota), no gasoline washes the L3B intake valves. Oil vapors from the PCV system bake into hard carbon layers. The L3B carbon buildup problem becomes noticeable at 60,000–100,000 miles; short-trip driving accelerates deposit formation.1412
⚠️ Symptoms:
- ⚠️ Rough or inconsistent idle, especially cold starts
- ⚠️ Engine misfires (P0300-series DTCs)
- ⚠️ Gradual loss of power and throttle response
- ⚠️ Reduced fuel economy (2–4 MPG drop)
Root Cause: Direct-injection-only design without port injectors. PCV oil vapors coat valve surfaces; heat bakes residue into hard carbon. GM chose not to add port injectors to keep manufacturing costs lower.144
L3B Carbon Buildup Repair Options & Costs:
| Repair | Cost (USD) | Notes |
|---|---|---|
| Walnut shell blasting (professional) | $400–$600 | Most effective; 3–4 hrs for I415 |
| Chemical intake cleaning | $150–$250 | Less effective for heavy deposits |
| Oil catch can installation | $80–$200 | Preventive |
| DIY walnut blasting | $100–$200 | Requires media blaster + intake removal |
🔧 Prevention: Use Top Tier gasoline, take regular highway drives (20+ min), install an oil catch can, and schedule walnut blasting every 60,000–80,000 miles.124
Problem #3: L3B Fuel Injector Failure & Clogging
Problem Description & Frequency:
The L3B’s high-pressure direct injectors spray fuel at 3,000 PSI into the combustion chamber. Exposure to extreme heat causes carbon deposits on injector nozzles (“coking”). GM issued Emission Recall N232427950 in 2024 affecting ~232 units of 2023 models due to L3B injector flow-rate inconsistencies. Injector problems typically surface at 40,000–80,000 miles.1614122
⚠️ Symptoms:
- ⚠️ Check engine light (P0201–P0204 injector codes)
- ⚠️ Engine misfires at idle or cold start
- ⚠️ Reduced fuel efficiency and rough idle
- ⚠️ Crank-no-start conditions
Real L3B Owner Example: “My 2022 Silverado LTZ with 3,000 miles — engine code P0201 cylinder #1 fuel injector. 2 weeks at dealer, no parts available.” — ChevyTrucks.org4
L3B Injector Repair Options & Costs:
| Repair | Cost (USD) | Notes |
|---|---|---|
| Single injector (OEM) | $45–$80 each | RockAuto pricing17 |
| Full set replacement (4 + labor) | $400–$800 | Replace all 4 for balance |
| Ultrasonic injector cleaning | $100–$200 | Can salvage clogged units |
| Fuel additive (Chevron Techron) | $10–$25 | Preventive, every 5,000 mi |
🔧 Prevention: Use Top Tier fuel, add fuel system cleaner every 5,000 mi, check L3B recall eligibility on 2023 models via NHTSA portal.16
Problem #4: High-Pressure Fuel Pump (HPFP) Failure
Problem Description & Frequency:
The cam-driven HPFP pressurizes fuel to 3,000 PSI for the L3B direct injection system. It is sensitive to fuel contamination and wear. Important context: Multiple independent sources note that HPFP failure on the L3B is not as widespread as some websites suggest. The pump is generally expected to last 100,000+ miles with proper maintenance.6144
⚠️ Symptoms:
- ⚠️ Hard starting or extended cranking (cold)
- ⚠️ Engine stalling under load
- ⚠️ Hesitation during acceleration
- ⚠️ DTC P0087 (Fuel Rail Pressure Too Low)
L3B HPFP Repair Options & Costs:
| Repair | Cost (USD) | Notes |
|---|---|---|
| HPFP replacement (parts + labor) | $800–$1,500 | OEM pump recommended |
| Fuel filter replacement | $30–$80 | Check before pump diagnosis |
| Complete fuel system flush | $200–$400 | If contamination confirmed |
🔧 Prevention: Never run the tank below 1/4 full, change fuel filter on schedule, use Top Tier gasoline from high-turnover stations.4
3️⃣ L3B Reliability & Longevity
Real-World Durability Data
Despite the L3B problems listed above, the GM 2.7 Turbo L3B is fundamentally reliable. Multiple sources confirm the vast majority of owners experience no major issues.
“While there was a lot of skepticism when this engine was released, it has turned out to be very reliable.” — ChevyTrucks.org4
“95% or more of the owners have nothing bad to say. GM has more trouble keeping up with demand than repairing existing units.” — LifeOnFour.co14
“The L3B seems to be the most reliable engine they are using in their trucks right now, which is crazy! 20k miles on mine with no issues.” — Reddit r/chevycolorado18
| Mileage Milestone | Probability (estimated) | Notes |
|---|---|---|
| 100,000 mi / 160,000 km | ⭐ ~90–95% | With proper L3B maintenance |
| 150,000 mi / 240,000 km | ⭐ ~75–85% | May need carbon cleaning |
| 200,000 mi / 320,000 km | ⭐ ~50–65% | Turbo/HPFP may need work |
| 250,000+ mi / 400,000+ km | ⭐ ~25–40% | Requires proactive care |
Average expected L3B lifespan: 170,000–250,000 miles (270,000–400,000 km).197
📊 L3B Maintenance Schedule & Costs
| Service | Interval | Cost (USD) | Importance |
|---|---|---|---|
| Oil & filter change | 5,000 mi / 8,000 km | $35–$65 DIY / $70–$120 dealer | ✅ Critical |
| Spark plug replacement | 60,000 mi / 96,000 km | $80–$150 DIY / $200–$350 dealer | ✅ Critical |
| Engine air filter | 15,000–30,000 mi | $20–$40 | ⚠️ Important |
| Transmission fluid | 45,000 mi | $150–$300 | ✅ Critical |
| Coolant flush | 100,000 mi | $100–$200 | ⚠️ Important |
| Walnut blasting | 60,000–80,000 mi | $400–$600 | ⚠️ Recommended |
| Fuel filter | 30,000–40,000 mi | $30–$80 | ⚠️ Important |
| Transfer case fluid (4WD) | 45,000 mi | $80–$150 | ✅ Critical (4WD) |
L3B Engine Condition Guide
| Mileage | Condition | What to Expect |
|---|---|---|
| Under 50,000 mi | ✅ Excellent | Minimal wear; check L3B recalls/TSBs |
| 50,000–100,000 mi | ✅ Good | Spark plugs due; first carbon cleaning |
| 100,000–150,000 mi | ⚠️ Fair | Injectors, HPFP may need attention |
| 150,000+ mi | ⚠️ Higher Risk | Budget for turbo/lifter work |
🔍 L3B Pre-Purchase Inspection Checklist
- ✅ Pull OBD-II codes — check for active and pending DTCs
- ✅ Check oil level and quality — dark/gritty oil indicates neglect
- ✅ Listen for turbo whine, ticking, or knock at cold start
- ✅ Verify service records — L3B oil change history is critical
- ✅ Test drive: check for hesitation, rough idle, boost delivery
- ✅ Check for oil leaks around turbo feed/return lines and oil cooler
- ✅ Verify VIN against NHTSA recalls and GM campaigns
- ✅ Request compression test if mileage exceeds 100,000 miles
4️⃣ L3B Tuning & Performance Modifications
Software Modifications
The L3B engine responds exceptionally well to tuning. Boost, fuel pressure, and timing are electronically controlled, making software changes highly effective.23
⚠️ All tuning modifications void the factory powertrain warranty.
JB4 Piggyback Tuner (Stage 1)
The Burger Motorsports JB4 is the most popular and proven tuning solution for the L3B engine. It plugs into the factory ECU and manipulates boost, fuel pressure, and timing signals.23
| Parameter | Stock | JB4 Tuned | Gain |
|---|---|---|---|
| Wheel HP (trucks) | ~260 whp | ~345 whp | +85 whp |
| Wheel Torque (trucks) | ~350 wtq | ~470 wtq | +120 wtq |
| Wheel HP (Cadillac CT4) | ~240 whp | ~300 whp | +60 whp |
| Cost | — | $500–$700 | — |
Livernois Flash Tune (Stage 1+)
Livernois Motorsports offers a full ECU flash for 2022.5–2025 Silverado/Sierra L3B 2.7L, requiring an HP Tuners MPVI3.24
| Parameter | Stock | 93 Octane Tune | Gain |
|---|---|---|---|
| Wheel HP | ~260 whp | ~310 whp | +50 whp |
| Wheel Torque | ~350 wtq | ~433 wtq | +83 wtq |
| Cost | — | $800–$1,200 (includes hardware) | — |
L3B Hardware Upgrades (Stage 2)
| Modification | HP Gain | Torque Gain | Cost (USD) |
|---|---|---|---|
| Cold Air Intake (aFe, K&N) | +15–25 hp | +20–30 lb-ft | $250–$400 |
| Downpipe (catted) | +10–15 hp | +10–15 lb-ft | $300–$600 |
| Cat-back exhaust | +3–5 hp | Minimal | $400–$1,000 |
| Upgraded intercooler | +5–10 hp | +5–10 lb-ft | $400–$800 |
| Combined L3B Stage 2 Total | +80–100+ whp | +100–120+ wtq | $1,500–$3,000 |
⚠️ L3B Tuning Risk Assessment
| Modification | Warranty | Engine Life Impact | Daily Driver Safe? |
|---|---|---|---|
| JB4 Piggyback | ❌ Voids if detected | Moderate | ✅ Yes (removable) |
| ECU Flash Tune | ❌ Voids (detectable) | Moderate-High | ⚠️4 Depends on tune |
| Cold Air Intake only | ⚠️ Grey area | Minimal | ✅ Yes |
| Catless Downpipe | ❌ Illegal on-road | Minimal w/ tune | ❌ Failed emissions |
Daily driver recommendation: JB4 alone provides the best balance of L3B power, reversibility, and risk.23
5️⃣ L3B Buying Guide
💰 Used L3B Pricing (2025 USD — Silverado 1500 2.7L)
| Mileage Range | Condition | Typical Price | Risk Level |
|---|---|---|---|
| Under 30,000 mi | Excellent | $32,000–$42,000 | ✅ Low |
| 30,000–60,000 mi | Very Good | $26,000–$35,000 | ✅ Low |
| 60,000–100,000 mi | Good | $20,000–$28,000 | ⚠️ Low-Medium |
| 100,000–150,000 mi | Fair | $15,000–$22,000 | ⚠️ Medium |
| 150,000+ mi | Variable | $10,000–$17,000 | ❌ Medium-High |
L3B Year-by-Year Analysis
| Model Year | Rating | Key Notes |
|---|---|---|
| 2019 | ⚠️ Fair | First year; L3B wiring harness recall; 348 lb-ft only7 |
| 2020 | ✅ Good | Early L3B issues resolved; same specs as 2019 |
| 2021 | ✅ Good | Stable production; final pre-refresh year |
| 2022 | ⭐ Very Good | Major L3B update — 430 lb-ft torque; improved NVH25 |
| 2023 | ⚠️ Good (check VIN) | Casting recall ~14 units; injector recall ~232 units2616 |
| 2024–2026 | ⭐ Excellent | TurboMax branding; most refined L3B versions2 |
⭐ Best L3B years: 2022, 2024–2026. ⚠️ Extra caution: 2019 (first year), 2023 (check VIN for recalls).
Final L3B Recommendation
✅ Best For:
- Daily drivers wanting V8 torque with better economy
- Moderate towing (under 9,000 lbs) and weekend hauling
- Buyers who maintain vehicles on schedule with quality fluids
- Those comfortable with modern turbocharged L3B engine technology
❌ Avoid If:
- You cannot commit to 5,000-mile oil changes with quality synthetic oil
- You need heavy towing (10,000+ lbs regularly)
- You want traditional V8 sound and feel
- You plan to skip scheduled L3B maintenance
6️⃣ L3B FAQ
What is the average repair cost for the L3B engine?
Minor L3B repairs (injector cleaning, fuel filter, spark plugs) typically cost $100–$350 USD. Major L3B repairs (AFM lifters, turbo, HPFP) range $800–$3,500 USD. A replacement long block costs ~$6,800 USD.27
How many miles can I expect from an L3B engine?
With proper maintenance, most L3B engines last 170,000–250,000 miles (270,000–400,000 km). Some fleet vehicles exceed 180,000 miles with no major L3B engine work.194
Is the L3B reliable for daily driving?
Yes. The majority of L3B owners report no major issues. Carbon buildup and AFM quirks are manageable with proper L3B maintenance.1814
What oil should I use in the L3B for longevity?
Dexos1 Gen 2 5W-30 full synthetic (Mobil 1, ACDelco, Pennzoil Platinum). L3B oil capacity: ~6 quarts. Change every 5,000 miles.2122
Is it worth buying a used truck with the L3B?
Yes, if service history is verified. L3B 2022+ models recommended for the 430 lb-ft upgrade. Budget $400–$600 for inspection and walnut blasting.14
What are the most common L3B problems?
(1) AFM lifter/solenoid failure, (2) carbon buildup on intake valves, (3) fuel injector clogging, (4) HPFP wear. All manageable with proactive L3B maintenance.124
How much does L3B tuning cost?
JB4: $500–$700 (+85 whp). Flash tune: $800–$1,200 (+50 whp). Full L3B Stage 2 with hardware: $1,500–$3,000 (100+ whp total).2423
What is the towing capacity with the L3B 2.7L Turbo?
Up to 11,300 lbs (2WD + Max Trailering Package) or 9,000–9,200 lbs in standard Crew Cab. L3B payload: up to 2,280 lbs.1110
No. The L3B runs on regular 87-octane. Top Tier fuel is strongly recommended. Premium (91–93) only needed for tuned L3B engines.2
Can you disable AFM on the L3B?
Yes. Options: AFM disabler ($100–$200), HP Tuners software ($300–$600), or full AFM delete with non-AFM lifters ($1,200–$2,500).4
Pricing data is current as of March 2026 in USD. All costs reflect typical North American market rates and may vary by location, labor rates, and parts availability. Recommendations are based on analysis of 80+ professional sources, factory service data, NHTSA recall databases, and 75+ verified owner experiences from 2020–2026.
References
1. GM L3B engine – Wikipedia – It is an undersquare aluminum DOHC inline-four displacing 2.7 liters (166 cid) and tuned for strong …
2. GM 2.7L L3B I-4 Turbo Engine Info, Specs, Wiki – The GM L3B engine made its debut in the 2019 Chevrolet Silverado 1500 and 2019 GMC Sierra 1500 produ…
3. Turbo 2.7L L3B Engine Being Considered For Other GM Vehicles – GM is considering using the turbocharged 2.7L I4 L3B engine for other vehicles beyond mid-size and f…
4. The 5 Most Common GM 2.7L L3B Engine Problems – How reliable is the Chevy 2.7L Turbo L3B engine? Read about common problems with the engine includin…
5. GM Turbo 2.7L I4: Less Power, More Torque Than Ford 2.7L V6 – How does the GM turbocharged 2.7L I4 L3B gasoline engine compare to the Ford twin-turbo 2.7L V6 Nano…
6. GM 2.7L L3B Engine: Everything You Need to Know – The GM 2.7L L3B engine has quickly become one of the most important modern truck engines, powering t…
7. L3B – двигатель Cadillac CT4 2.7 литра | Otoba.ru – … GMC. Дефорсированная до 237 л.с. 353 Нм модификация данного мотора … На какие модели ставится …
8. Four Cylinder Chevrolet Silverado Gets Worse MPG Than V8 | GM Authority – The 2.7-liter turbocharged four cylinder Chevrolet Silverado returned worse fuel economy than a simi…
9. Chevrolet Silverado MPG: Compare Fuel Efficiency of All Engines and Trims (2025) – Chevrolet Silverado MPG: Compare Fuel Efficiency of All Engines and Trims (2025)
10. THE ALL-NEW CHEVROLET 2.7L TURBO ENGINE – Some innovative features that sent the Chevy L3B apart is features like Active Fuel Management, Dire…
11. Here’s How Much The 2025 Chevy Silverado 1500 Can Tow – As these tables highlight, the 2025 Silverado 1500 with a ball hitch can tow a maximum of 13,300 pou…
12. Chevy 2.7 Turbo Problems: 3 Common Engine Failures Explained – Is the TurboMax reliable? We detail common Chevy 2.7 Turbo problems like fuel injector failure, carb…
13. Why does everyone have a problem with the 2.7? : r/Silverado – Reddit – The AFM is what causes all the issues. The AFM can be disabled by driving the truck in L7 for majori…
14. GM 2.7L L3B Engine Problems – But Wait, It’s Actually A Great Engine? – 4 Cylinders and full-size pickup trucks do not usually mix well. Well, the L3B begs to differ. Here …
15. How Much Does Carbon Cleaning Cost? – The Pricer – Over years of driving, harmful carbon deposits inevitably build up inside your vehicle’s engine from…
16. [PDF] Emission Recall N232427950 Fuel Injector Flow Rate – nhtsa
17. 2019 CHEVROLET SILVERADO 1500 2.7L L4 Turbocharged Fuel … – CHEVROLET > 2019 > SILVERADO 1500 > 2.7L L4 Turbocharged > Fuel & Air > Fuel Injector. New. Collapse…
18. Question on the L3B – Reliability : r/chevycolorado – Reddit – The L3B seems to be the most reliable engine they are using in their trucks rn which is crazy! 20k m…
19. GM 2.7L Turbo L3B Engine: Problems, Longevity, And Specs – Today, we’ll be discussing the 2.7L 4-Cylinder Turbocharged engine offered by General Motors in the …
20. What scheduled maintenance should I do 2022 chevrolet silverado 1500 LT – 2.7L with approximately ~ 60,000 miles? – What scheduled maintenance should I do 2022 chevrolet silverado 1500 LT – 2.7L with approximately ~ …
21. [HOW TO] Change the Oil & Filter on the GM – L3B 2.7L TurboMax … – UPDATE: I still have this truck as of 6/20/2024. It has over 105000 miles on it now. It does burn so…
22. 2022 Silverado LTD 2.7L Turbomax 4 Cylinder 96,000 mile UPDATE & PSA (L3B/L2R) – The GM L3B Turbomax 2.7L motor has been known to consume oil. I recommend checking the oil level fre…
23. GM 2.7 L3B Turbo Performance Upgrades Guide – Best Mods – Ultimate mod guide for L3B GM 2.7 turbo covering engine tuning, cold air intakes, downpipes, and exh…
24. 2022.5-2025 chevrolet silverado & gmc sierra 2.7 l turbo tuner – 2022.5-2025 CHEVROLET SILVERADO & GMC SIERRA 2.7L TURBO TUNER
25. GM Engineer: L3B turbo-four is a true truck engine – Hagerty Media – The latest gasoline truck engine from General Motors, its 2.7-liter turbocharged L3B inline-four, is…
26. GM Replacing 2023 Chevy Silverado 2.7L Engines Due To Cracks – Some units of the 2023 Chevy Silverado 1500 were equipped with turbo 2.7L engines with a cracked blo…
27. 12743582 – 2.7 Liter I-4 Turbo L3B Replacement Long Block Engine – Use part number 12743582 for 2019 trucks, and 2020 to 2022 Cadillac Models.