Cummins ISX11.9 385
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 | 3865; FR20350correct |
|---|---|
| Engine family | CCEXH0729XADcorrect |
| Engine families | CCEXH0729XADcorrect |
| Fuel | dieselcorrect |
| Rated output | 282.6 kW (= 379 bhp)correct |
| Rated speed | 1,977 rpmcorrect |
| Maximum torque | 1,450 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 | Urban Buscorrect |
|---|
Frequently asked questions
How much power does the Cummins ISX11.9 385 have?
The Cummins ISX11.9 385 delivers 283 kW.
When was the Cummins ISX11.9 385 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.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
Request a quote →
We ask the suppliers and come back with price and lead time.
Request spare parts →
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.
Missing a figure you were looking for? Report it →
Know this machine better? Have a photo, a manual, or know that a figure is wrong? Add it to the register →
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 385R
ISX11.9 400
ISX11.9 400EV
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 (42)
Manufacturer part numbers from the official EPA documentation. No prices or availability — those come from the supplier.
| Part number | Description | Manufacturer |
|---|---|---|
| 4076493 | Barometric Pressure Sensor 1 | Cummins |
| 4088833 | Comp In Temp | 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 |
| 2872467 | DOC In Temp | Cummins |
| 2872468 | DPF Out Temp | Cummins |
| 2871960 | Diesel Particulate Filter Pressure | Cummins |
| 4993120 | ECM / Motorsteuergerät | Cummins |
| 4954250 | EGR Cooler Out Temp | Cummins |
| 2872210 | EGR Flow Delta Press | Cummins |
| 4928594 | Exhaust Manifold Pressure;EGR Orifice Pressure Sensor;EGR pressure sensor | Cummins |
| 2872233 | Einspritzpumpe | Cummins |
| 2872929 | Einspritzpumpe | Cummins |
| 2872279 | Crankshaft Position Sensor;Camshaft Position Sensor;Crankshaft Position Sensor;Crankshaft Position Sensor;Camshaft Position Sensor;Camshaft Position Sensor;Engine Camshaft;Engine Crankshaft;Engine Crankshaft;Engine Crankshaft Position Sensor;Engine Crankshaft Position Sensor;Engine Crankshaft | Cummins |
| 2872081 | Engine Out NOx | Cummins |
| 2872082 | Engine Out NOx | Cummins |
| 2894941 | Engine Out NOx | Cummins |
| 2894942 | Engine Out NOx | Cummins |
| 2872424 | Exhaust Gas Recirculation Pressure | 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 |
| 4954245 | Fuel Rail Pres | Cummins |
| 4921519 | Hydrocarbon Doser Fuel | Cummins |
| 2872289 | Injektor | Cummins |
| 2882544 | Injektor | Cummins |
| 4921324 | Intake Mnfld Temp and Pressure | Cummins |
| 2872469 | SCR Out Temp | Cummins |
| 2871974 | System Out NOx | Cummins |
| 2871978 | System Out NOx | Cummins |
| 2871979 | System Out NOx | Cummins |
| 2872236 | System Out NOx | Cummins |
| 2894939 | System Out NOx | Cummins |
| 2894940 | System Out NOx | Cummins |
| 2894943 | System Out NOx | Cummins |
| 2894944 | System Out NOx | Cummins |
| 2839964 | Turbo Speed | Cummins |
| 2840010 | Turbolader | Cummins |
| 2840013 | Turbolader | Cummins |
| 2842202 | Turbolader | Cummins |
| 2842203 | Turbolader | Cummins |
| 2843891 | Turbolader | Cummins |
| 2843894 | Turbolader | Cummins |
| 3773556 | Turbolader | Cummins |
| 3773559 | Turbolader | Cummins |
Source: 2012 Model Year On-Highway Heavy-Duty Engine Certification Data
Enquire about these parts