- 2027 GMC Canyon L4B engine: The new 2.7L turbo replaces the L3B, delivering 350 hp and 455 lb-ft.
- Power gain: Roughly 10% more horsepower and 25 lb-ft more torque than the outgoing engine.
- Transmission: The 8-speed 8L80 automatic remains standard across the lineup.
- Refinements: Updated turbocharger, thermal/cooling system, and reduced noise and vibration.
- Rival check: Beats nearly every gas midsize rival except the Ford Ranger Raptor's 405 hp.
2027 GMC Canyon L4B Engine: What Changed
The 2027 GMC Canyon L4B engine is the biggest powertrain news for GMC's midsize truck in years. General Motors introduced the L4B as the successor to the L3B 2.7L turbo, first confirming it for the Silverado 1500 and Sierra 1500. Evidence from the public GM Fleet Order Guide now shows the L4B TurboMax listed as a new feature for the midsize Colorado — and the deleted L3B — pointing strongly to the same engine arriving in the Canyon.
Video Highlights:
- GM's new L4B 2.7L turbo makes 350 hp at 5,200 rpm and 455 lb-ft at 3,000 rpm
- Gains come from an updated turbocharger, revised thermal/cooling system, and NVH improvements
- Fleet Order Guide shows the L3B deleted for 2027 midsize trucks
- Ranger Raptor (405 hp) remains the only more powerful gas midsize rival
| Spec | L3B (Outgoing) | L4B (2027) |
|---|---|---|
| Displacement | 2.7L turbo I4 | 2.7L turbo I4 |
| Horsepower | 310 hp | 350 hp @ 5,200 rpm |
| Torque | 430 lb-ft | 455 lb-ft @ 3,000 rpm |
| Transmission | 8-speed 8L80 | 8-speed 8L80 |
| Key updates | Baseline | New turbo, thermal system, NVH work |
GM has announced the L4B specs for its half-ton trucks, and the Fleet Order Guide strongly indicates the engine is coming to the Colorado and Canyon — but GMC has not issued a formal Canyon-specific press release. Treat final numbers as highly likely but pending official confirmation, and note one industry comment suggests the midsize tune could differ slightly.
Engineering Updates and Refinements
The L4B is more than a simple retune. GM engineers focused on three areas to extract the extra output and improve drivability:
Turbocharger
- Revised turbo design
- Boosts output by 40 hp
- Maintains low-end torque delivery
Thermal System
- Upgraded cooling architecture
- Better heat management under load
- Supports sustained towing power
NVH Improvements
- Reduced noise and vibration
- Smoother operation under strain
- Addresses complaints about the L3B
Owners of the previous L3B often praised its monstrous low-end torque but noted harshness and unpleasant noises under hard strain. The L4B's refinement work directly targets those complaints, which matters for a truck that doubles as a family vehicle and a tow rig.
Real-world L3B owners regularly towed loads around 6,000 lb successfully. If the L4B keeps that torque behavior while smoothing out noise and vibration, it becomes a meaningfully better daily driver — not just a stronger stat sheet.
How the L4B Compares to Midsize Rivals
With 350 hp, the L4B would make the Canyon one of the most powerful gas-powered midsize trucks on the market. Here is how the segment stacks up:
| Truck / Engine | Horsepower | Torque |
|---|---|---|
| 2027 Canyon L4B (expected) | 350 hp | 455 lb-ft |
| Ford Ranger Raptor 3.0L EcoBoost | 405 hp | 430 lb-ft |
| Toyota Tacoma i-Force Max Hybrid | 326 hp | 465 lb-ft |
| Ford Ranger 2.7L EcoBoost | 315 hp | ~400 lb-ft |
| Nissan Frontier 3.8L V6 | 310 hp | 281 lb-ft |
| Jeep Gladiator 3.6L V6 | 285 hp | 260 lb-ft |
| Honda Ridgeline 3.5L V6 | 280 hp | 262 lb-ft |
| Toyota Tacoma 2.4L Turbo | 278 hp | 317 lb-ft |
| Ford Ranger 2.3L EcoBoost | 270 hp | 310 lb-ft |
The only gas rival clearly ahead on horsepower is the Ranger Raptor, which is a high-performance halo model that competes more with the ZR2 Bison and AT4X AEV than with mainstream trims. The Tacoma hybrid posts slightly more torque (465 lb-ft) but relies on electric assistance and trails by 24 hp.
Among conventional gas midsize powertrains, the L4B's 350 hp figure would be best-in-class. The Ranger Raptor remains the outright performance king for acceleration and smoothness, but the Canyon closes the gap dramatically.
Mechanical Setup: Transmission, Towing, and Trims
The rest of the Canyon's mechanical package stays familiar. The 8-speed 8L80 transmission remains standard across the board, and the rear axle ratio is listed at 3.42:1. Current Colorado/Canyon towing sits at a class-leading 7,700 lb; unofficial reports hint the 2027 rating could shift slightly, though nothing is confirmed.
| Item | 2027 Detail |
|---|---|
| Transmission | 8-speed 8L80 automatic, standard |
| Rear axle ratio | 3.42:1 |
| Current max towing (2026) | 7,700 lb |
| 2027 towing | Possibly slightly reduced (unofficial) |
| Half-ton comparison | Silverado L4B rated at 9,400 lb |
Expected Canyon trim structure carries over, topped by the off-road flagship:
- Base/work truck tier
- Mid-level and trail-oriented trims (Z71-equivalent, AT4)
- AT4X AEV edition — the top-dog Canyon off-roader
Do not assume the half-ton's 9,400 lb rating transfers to the Canyon. The midsize platform will carry a lower rating, and early leaks suggest it may dip slightly from 7,700 lb. Wait for GMC's official 2027 towing charts before planning heavy loads.
Buyer Checklist: Tracking the L4B Rollout
Verify Official Confirmation
Watch for GMC's formal press release confirming the L4B TurboMax in the 2027 Canyon, including any midsize-specific tune differences.
Check Final Specs
Compare announced Canyon figures against the Silverado's 350 hp / 455 lb-ft to spot any detuning for the smaller truck.
Review Towing Ratings
Confirm the official 2027 tow rating and whether trailer brake controller availability changes by trim.
Read Independent Testing
Look for real-world reviews — towing grades, fuel-economy loops, and NVH evaluations — before ordering.
Pick Your Trim
Decide whether the AT4X AEV's off-road hardware justifies its premium over lower trims with the same engine.
Before You Buy a 2027 Canyon:
- Confirm L4B engine is officially listed for Canyon
- Verify final horsepower and torque ratings
- Check 2027 towing capacity vs. 2026's 7,700 lb
- Review independent tow and MPG test results
- Compare AT4X AEV pricing against rivals like Ranger Raptor
If the L4B arrives as indicated, the 2027 Canyon gains a class-leading 350 hp gas engine with best-in-segment torque for conventional powertrains — a major leap over every mainstream rival.
FAQ
Q: What is the 2027 GMC Canyon L4B engine?
The L4B is GM's updated 2.7L turbocharged four-cylinder that succeeds the L3B. It produces 350 hp at 5,200 rpm and 455 lb-ft of torque at 3,000 rpm, gains of 40 hp and 25 lb-ft over the previous engine, thanks to a revised turbocharger and improved thermal management.
Q: Is the L4B confirmed for the Canyon, or just the Silverado?
GM has officially announced the L4B for the Silverado 1500 and Sierra 1500. The public GM Fleet Order Guide lists the L4B TurboMax as new for the midsize trucks and deletes the L3B, strongly indicating Canyon adoption, but GMC has not yet issued a Canyon-specific announcement.
Q: How does the L4B compare to the Ford Ranger Raptor?
The Ranger Raptor's 3.0L EcoBoost makes 405 hp and 430 lb-ft, so it stays ahead on horsepower. The L4B counters with more torque (455 lb-ft) and beats every other gas midsize truck in the segment on both metrics.
Q: Does the transmission change for 2027?
No. The 8-speed 8L80 automatic remains standard across the lineup, paired with a 3.42:1 rear axle ratio, matching the current setup.