Cummins X15N 400
Built: 2024-2026 · Series: X15N
More machines from model year 2024
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Cummins X15N — the First Natural-Gas Engine Built for Long-Haul Trucking – inline six-cylinder natural-gas engine of 14.9 litres, up to 500 hp, for heavy-duty long-haul trucking
The X15N is the natural-gas (CNG) version of the Cummins X15 platform and, according to Cummins, the first natural-gas engine purpose-built for long-haul trucking at this power level. It shares the diesel X15's 14.9-liter displacement and 137 x 169 mm bore and stroke. Cummins rates it at up to 500 hp and 1,850 lb-ft of torque.
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Development included fleet testing of pre-production engines starting in 2023, building on early success in the Chinese truck market; North American series production began in 2024 at the Jamestown, New York plant. The X15N complements the diesel X15 family with a gas variant that Cummins says achieves CO2 and NOx levels roughly 90 percent below current EPA limits.
From late 2024 the X15N became available in Peterbilt and Kenworth chassis, and Freightliner added it from early 2025 — signaling that the engine is establishing itself as a natural-gas alternative in heavy-duty long-haul trucking.
Like other stoichiometric gas engines, the X15N follows the Otto-cycle principle with spark ignition rather than a diesel's compression ignition, so specific output per litre is naturally lower than a comparable diesel inline six. On vehicles fuelled with liquefied natural gas (LNG), the gas system also involves the cryogenics of insulated tanks, whose vacuum insulation and boil-off management are additional, LNG-specific check points compared with a pure CNG version.
Given how new the technology is, a used X15N truck should be checked primarily for gas-system maintenance (tanks, injection system) and its certification; there is little public long-term wear data yet for this young engine.
Sources: SpecCodex register, model data: Cummins X15N, Cummins (manufacturer)
Technical data
Engine
| Engine code | XH1correct |
|---|---|
| Engine family | TCEXH0886XDAcorrect |
| Engine families | TCEXH0886XDA; SCEXH0886XDA; RCEXH0886XDAcorrect |
| Fuel | Compressed Natural Gas, Liquefied Natural Gascorrect |
| Rated output | 298.3 kW (= 400 hp)correct |
| Rated speed | 1,900 rpmcorrect |
| Maximum torque | 1,450 ft·lbfcorrect |
| Speed at max. torque | 900 rpmcorrect |
| Displacement | 12,900 cm³correct |
| Displacement | 12.9 lcorrect |
| Operating cycle | dieselcorrect |
| Injection | throttle-body injectioncorrect |
| Aspiration | turbochargedcorrect |
Origin and approval
| Version | XH1correct |
|---|---|
| Built from | 2024correct |
| Built to | 2026correct |
| Model year from | 2024correct |
| Model year to | 2026correct |
| Sales region | USA certificationcorrect |
Other data
| Application | Both Tractor and Vocationalcorrect |
|---|
Frequently asked questions
How much power does the Cummins X15N 400 have?
The Cummins X15N 400 delivers 298 kW.
What engine does the Cummins X15N 400 have?
12,900 cm³ displacement, Compressed Natural Gas, Liquefied Natural Gas.
When was the Cummins X15N 400 built?
Production years: 2024-2026.
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 23 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Sources: US EPA — engine certification data (retrieved August 2026) · How we check the data
Diesel engine in 3D section
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Parts for this engine (29)
Manufacturer part numbers from the official EPA documentation. No prices or availability — those come from the supplier.
| Part number | Description | Manufacturer |
|---|---|---|
| 4902912 | Catalyst Temperature Sensor;Catalyst temp. sensor | Cummins |
| 4954574 | Catalyst Temperature Sensor;Catalyst temp. sensor | Cummins |
| 2897334 | Compressor Outlet Pressure Sensor;Comp out pressure sensor | Cummins |
| 5698456 | Compressor Outlet Pressure Sensor;BarometricPressureSensor;Comp out pressure sensor | Cummins |
| 4954905 | Coolant Temperature Sensor;Coolant Temp Sensor;Coolant Temperature Sensor;Engine Out NOx Sensor 2;Coolant Temperature Sensor;Oil Temperature Sensor;Oil Temperature Sensor;Coolant Temperature Sensor;Coolant temp sensor | Cummins |
| 6471800 | Crank position sensor | Cummins |
| 5462277 | Crankcase Pressure;CCV Outlet Pressure;CCV Outlet Pressure;Crankcase Pressure;Crankcase pressure sensor | Cummins |
| 6426851 | EGR cooler | Cummins |
| 4928594 | Exhaust Manifold Pressure;EGR Orifice Pressure Sensor;EGR pressure sensor | Cummins |
| 5582529 | EGR valve | Cummins |
| 5654090 | ECM (ID 15) | Cummins |
| 5491326 | Engine Crankshaft;Engine Camshaft;Engine Camshaft;Engine Crankshaft;Engine Crankshaft;Engine Crankshaft;Engine Crankshaft service part;Engine Camshaft;Cam position sensor | Cummins |
| 2872858 | EGR Out Temperature Sensor;Intake Manifold Temp Sensor;EGR Out Temperature Sensor;EGR Out Temperature Sensor;Intake Manifold Temp Sensor;EGR temp sensor | Cummins |
| 4384687 | EGR delta pressure sensor | Cummins |
| 6419884 | EGR delta pressure sensor | Cummins |
| 5491909 | Exhaust Pressure Sensor;EMP Sensor;Exhaust Manifold sensor | Cummins |
| 9999999 | Fuel Injector Pump;Fuel Injection Pump | Cummins |
| 5714872 | Injector | Cummins |
| 4211495 | Fuel inlet Pressure Sensor | Cummins |
| 5613743 | Fuel outlet pressure sensor | Cummins |
| 4384340 | Humidity Sensor;Humidity sensor | Cummins |
| 4384132 | Intake manifold press/temp sensor | Cummins |
| 2897654 | Knock Sensor;Knock sensor | Cummins |
| 5491693 | Oil Pressure Sensor;Oil pressure sensor | Cummins |
| 5714868 | Primary oxygen sensor | Cummins |
| 4384382 | Oxygen Sensor;Sec. oxygen sensor | Cummins |
| 4394751 | Catalyst Element | Cummins |
| 4394752 | Catalyst Element | Cummins |
| 6474494 | Turbocharger (ID15) | Cummins |
Source: EPA HD Engines 2015–Present
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