Cummins ISX11.9 450 OG
Built: 2012 · Series: ISX11.9
More machines from model year 2012
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 ISX11.9 – the successor to the ISM for EPA 2010 (2010–2012): 11.9 litres, 310 to 500 hp, the template for the ISX12
The ISX11.9 is Cummins' answer to the US EPA 2010 emissions standard in the 12-litre class: in 2010 it replaced the 10.8-litre ISM, which had run in distribution trucks, tippers and buses since the 1990s, and adopted the architecture of the big ISX15 at a reduced scale – overhead camshaft, XPI common-rail injection, cooled EGR, particulate filter and SCR with urea. As early as 2013 it was renamed ISX12; the technology stayed, the name followed the marketing of the X programme.
Read on 3 more paragraphs
The number in the name is the output in hp; suffixes such as ST, EV, R, MC or AS mark torque curves and calibrations for particular transmissions and duties. The register lists 23 versions with 315 to 479 hp at a uniform rated speed of 1,977 rpm and 1,150 to 1,650 lb-ft (1,559 to 2,237 Nm) of torque at 1,200 rpm; all certifications carry model year 2012, electronic direct injection and single-stage turbocharging, service class HHDD and in one case urban bus.
The ISX11.9 marks the transition to SCR technology in this class: for the first time it needed urea, but in return cut fuel consumption compared with the EGR-only EPA 2007 generation, and it was fitted mainly in Peterbilt, Kenworth and Freightliner distribution vehicles and in coaches.
On used engines the early SCR systems are the checkpoint: NOx sensors, dosing module and particulate filter with regeneration history; the base engine is regarded as durable if the EGR was kept clean.
Sources: SpecCodex register, model data: Cummins ISX11.9 (EPA-Zertifizierungsdaten), Cummins Motoren (manufacturer), EPA-Zertifizierungsdaten Motoren
Technical data
Engine
| Engine code | 3438; FR20249correct |
|---|---|
| Engine family | CCEXH0729XACcorrect |
| Engine families | CCEXH0729XACcorrect |
| Fuel | dieselcorrect |
| Rated output | 322.1 kW (= 432 bhp)correct |
| Rated speed | 1,977 rpmcorrect |
| Maximum torque | 1,650 ft·lbfcorrect |
| Speed at max. torque | 1,200 rpmcorrect |
| Operating cycle | dieselcorrect |
| Injection | electronic direct injectioncorrect |
| Aspiration | single-stage turbocorrect |
Origin and approval
| Built from | 2012correct |
|---|---|
| Built to | 2012correct |
| Model year from | 2012correct |
| Model year to | 2012correct |
Other data
| Application | HHDDcorrect |
|---|
Frequently asked questions
How much power does the Cummins ISX11.9 450 OG have?
The Cummins ISX11.9 450 OG delivers 322 kW.
When was the Cummins ISX11.9 450 OG built?
Production years: 2012.
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
ISX11.9 310
ISX11.9 320R
ISX11.9 330
ISX11.9 330ST
ISX11.9 3330
ISX11.9 350
ISX11.9 350R
ISX11.9 350ST
ISX11.9 370
ISX11.9 385
ISX11.9 385R
ISX11.9 400
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 (2)
Manufacturer part numbers from the official EPA documentation. No prices or availability — those come from the supplier.
| Part number | Description | Manufacturer |
|---|---|---|
| 4928594 | Exhaust Manifold Pressure;EGR Orifice Pressure Sensor;EGR pressure sensor | Cummins |
| 2842203 | Turbolader | Cummins |
Source: EPA HD Engines 2015–Present
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