Cummins ISX15 420ST2
Built: 2016 · Series: ISX15
More machines from model year 2016
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Cummins ISX15 – the heavy six-cylinder of the EPA 2010 era (2010–2016): 14.9 litres, 362 to 583 hp, SCR instead of EGR alone
The ISX15 is the development stage of Cummins' ISX family, which appeared in 1998 as the first heavy Cummins with electronic control and replaced the N14. With the US emissions standard EPA 2010 the engine gained SCR aftertreatment with urea in addition to particulate filter and cooled exhaust gas recirculation – the previous EPA 2007 generation had relied on EGR alone and was known for high heat load and fuel consumption. The ISX15 ran until 2016 and was replaced in 2017 by the X15, which carries the same displacement forward.
Read on 3 more paragraphs
The number in the name is the output in hp; appended codes such as ST (SmartTorque, with increased torque in the top gears), EV or MC mark torque curves and calibrations. The register lists 31 versions with 362 to 583 hp at 1,698 to 1,977 rpm and 1,450 to 2,050 lb-ft (1,966 to 2,779 Nm) of torque between 1,000 and 1,200 rpm; certifications cover model years 2012 to 2016, electronic direct injection and single-stage turbocharging are recorded throughout, with 'HHDD' – heavy heavy-duty diesel – as the service class.
The ISX15 is tied to the first SCR years: urea dosing, NOx sensors and particulate filter regenerations were the workshop topics, while the base engine with its overhead camshaft and Cummins XPI common rail is regarded as robust.
On used engines, the condition of the aftertreatment (particulate filter, SCR catalyst, dosing module), mileage relative to overhaul history – a million miles is attainable on these engines – and the actually programmed power rating are what count.
Sources: SpecCodex register, model data: Cummins ISX15 (EPA-Zertifizierungsdaten), Cummins Motoren (manufacturer), EPA-Zertifizierungsdaten Motoren
Technical data
Engine
| Engine code | 4586:FR11490correct |
|---|---|
| Engine family | GCEXH0912XATcorrect |
| Engine families | GCEXH0912XATcorrect |
| Fuel | dieselcorrect |
| Rated output | 321.4 kW (= 431 bhp)correct |
| Rated speed | 1,698 rpmcorrect |
| Maximum torque | 1,750 ft·lbfcorrect |
| Speed at max. torque | 1,000 rpmcorrect |
| Operating cycle | dieselcorrect |
| Injection | electronic direct injectioncorrect |
| Aspiration | single-stage turbocorrect |
Origin and approval
| Built from | 2016correct |
|---|---|
| Built to | 2016correct |
| Model year from | 2016correct |
| Model year to | 2016correct |
Other data
| Application | HHDDcorrect |
|---|
Frequently asked questions
How much power does the Cummins ISX15 420ST2 have?
The Cummins ISX15 420ST2 delivers 321 kW.
When was the Cummins ISX15 420ST2 built?
Production years: 2016.
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 19 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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Other models in this series
ISX15
ISX15 400
ISX15 400ST
ISX15 400ST2
ISX15 415ST2
ISX15 425
ISX15 425ST
ISX15 450
ISX15 450ST
ISX15 450ST2
ISX15 455
ISX15 455EV
Sources: US EPA — engine certification data (retrieved August 2026) · How we check the data
Diesel engine in 3D section
Turn the model, look inside and click an assembly — each one is explained.
Parts for this engine (17)
Manufacturer part numbers from the official EPA documentation. No prices or availability — those come from the supplier.
| Part number | Description | Manufacturer |
|---|---|---|
| 2897331 | Barometric Pressure Sensor 2;Barometric Pressure Sensor | Cummins |
| 2897334 | Compressor Outlet Pressure Sensor;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 |
| 2871960 | Diesel Particulate Filter Pressure | Cummins |
| 2872944 | Engine Out NOx Sensor 1 | Cummins |
| 2872945 | Engine Out NOx Sensor 1 | Cummins |
| 4326470 | Engine Out NOx Sensor 1 | Cummins |
| 4326862 | Engine Out NOx Sensor 1 | Cummins |
| 4326870 | Engine Out NOx Sensor 1;Engine Out NOx Sensor | Cummins |
| 4307166 | Exhaust Gas Recirculation Pressure | Cummins |
| 2872943 | NOx Sensor Selective Catalytic Reduction | Cummins |
| 2872946 | NOx Sensor Selective Catalytic Reduction | Cummins |
| 2897307 | NOx Sensor Selective Catalytic Reduction | Cummins |
| 4326472 | Tailpipe NOx Sensor | Cummins |
| 4326874 | Tailpipe NOx Sensor | Cummins |
| 4307100 | Aftertreatment Temperature Sensor | Cummins |
| 4307102 | Aftertreatment Temperature Sensor | Cummins |
Source: 2014 Model Year On-Highway Heavy-Duty Engine Certification Data
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