HX55 2836376 Turbocharger for Detroit DD15 14.8L
2836376, 2836378, A4720960799, 4049886, 4049887
DD15 Turbochargers
New BorgWarner B3G and Holset HX55 Turbochargers for Detroit DD15 Freightliner Cascadia
The Detroit DD15 is the most popular heavy-duty diesel engine in North America — the engine that powers the Freightliner Cascadia, Western Star and other Daimler Trucks platforms. Its turbocharger changed twice across the DD15 production life: the early EPA10 engines used a Holset HX55 (fixed geometry, wastegated), and the 2015+ engines switched to the BorgWarner B3G with an integrated wastegate and speed sensor. We stock brand new turbochargers for both eras: the HX55 2836376 for early DD15 trucks, and three B3G variants (A4720901480, A4720901880 and 4720902780) covering 2015 through current production. Every unit is new-built, balanced, and matched by Detroit part number. No core charge. Shops, fleets and distributors order from US stock.
- 100% Brand New
- OEM-Spec Quality
- US Stock, Fast Dispatch
- Direct-Fit Replacement
- Exact Part-Number Match
- 1-Year Warranty
- No Core Charge
B3G A4720901480 Turbocharger for Detroit DD15 14.8L
4720901480, A4720901480, EA4720901480, R4720901480, RA4720901480
B3G A4720901880 Turbocharger for Detroit DD15 14.8L 2018+
4720901880, 4720902880, A4720901880, A4720902880, EA4720901880, EA4720902880
B3G 4720902780 Turbocharger for Detroit DD15 14.8L 2018+
A472096090, 4720902780, DCA4720902780, 1A4720902780, 2133300188
Cascadia Turbo Supply — Both the HX55 and B3G Eras
The Freightliner Cascadia is the best-selling Class 8 truck in America, and the DD15 turbo job is volume work for every heavy-duty diesel shop. The ordering challenge is that the DD15 switched turbo manufacturers and part numbers changed across model years. We stock both eras and verify by Detroit part number before shipping.
B3G BorgWarner for 2015+ Cascadias
Every DD15 turbo we ship is 100% new — new CHRA, new wheels, new wastegate mechanism. No core deposit, no old unit to crate and freight back. The DD15 turbo market is dominated by remanufactured units — a new turbo eliminates the unknown history of a reman core.
HX55 Holset for Early EPA10 DD15 Trucks
We stock both the Holset HX55 for early DD15 trucks (EPA10, part number 2836376) and the BorgWarner B3G for 2015 and newer Cascadias. Two different turbo manufacturers, two different designs, one source for both.
Two Manufacturers, Two Eras, Not Swappable
The B3G comes in three part number variants across DD15 production years: A4720901480 for 2015-2018, A4720901880 and 4720902780 for 2018 and newer. Each includes the wastegate actuator and speed sensor. Match by the Detroit or BorgWarner part number on the old turbo — model year alone is not reliable because of mid-year changes.
B3G Part Number Splits by Model Year
Early DD15 trucks (EPA10 era) use the Holset HX55 — a completely different turbo from a different manufacturer. The HX55 is a fixed-geometry wastegated turbo with no electronic components. It is not interchangeable with the B3G. See our HX55 turbocharger page for details on that platform.
Speed Sensor Included on B3G Units
Cascadia fleet maintenance operations replace DD15 turbos as scheduled service items. The Cascadia is the highest-volume Class 8 truck — we price and stock accordingly. Consistent wholesale cost from US inventory. See the wholesale page.
Cascadia Fleet Volume Supply
One-year warranty on every DD15 turbo, handled by our US team. Before install, inspect the oil feed and drain lines, check the charge-air cooler for leaks, and verify the speed sensor connector is clean and undamaged. See the warranty page.
B3G BorgWarner for 2015+ Cascadias
Every DD15 turbo we ship is 100% new — new CHRA, new wheels, new wastegate mechanism. No core deposit, no old unit to crate and freight back. The DD15 turbo market is dominated by remanufactured units — a new turbo eliminates the unknown history of a reman core.
HX55 Holset for Early EPA10 DD15 Trucks
We stock both the Holset HX55 for early DD15 trucks (EPA10, part number 2836376) and the BorgWarner B3G for 2015 and newer Cascadias. Two different turbo manufacturers, two different designs, one source for both.
Two Manufacturers, Two Eras, Not Swappable
The B3G comes in three part number variants across DD15 production years: A4720901480 for 2015-2018, A4720901880 and 4720902780 for 2018 and newer. Each includes the wastegate actuator and speed sensor. Match by the Detroit or BorgWarner part number on the old turbo — model year alone is not reliable because of mid-year changes.
B3G Part Number Splits by Model Year
Early DD15 trucks (EPA10 era) use the Holset HX55 — a completely different turbo from a different manufacturer. The HX55 is a fixed-geometry wastegated turbo with no electronic components. It is not interchangeable with the B3G. See our HX55 turbocharger page for details on that platform.
Speed Sensor Included on B3G Units
Cascadia fleet maintenance operations replace DD15 turbos as scheduled service items. The Cascadia is the highest-volume Class 8 truck — we price and stock accordingly. Consistent wholesale cost from US inventory. See the wholesale page.
Cascadia Fleet Volume Supply
One-year warranty on every DD15 turbo, handled by our US team. Before install, inspect the oil feed and drain lines, check the charge-air cooler for leaks, and verify the speed sensor connector is clean and undamaged. See the warranty page.
WHY CHOOSE US
Cascadia turbo supply that matches fleet pace
We verify by Detroit part number, hold both turbo eras on a US shelf, and ship fast. The Cascadia keeps America's freight moving — turbo downtime costs real money. More about our company and quality process.
FAQ
The DD15 has used two turbo families. Early DD15 engines (EPA10, pre-2015) use the Holset HX55 — a fixed-geometry wastegated turbo. The 2015 and newer DD15 engines use the BorgWarner B3G — a larger wastegated turbo with an integrated speed sensor. They are completely different turbo designs from different manufacturers and are not interchangeable.
No. The HX55 (Holset) and B3G (BorgWarner) are different turbo designs with different mounting, plumbing and sensor connections. The engine control module expects the turbo type that the truck was built with. Match by Detroit part number, not by engine model alone.
The B3G (2015+) includes a turbo speed sensor that communicates with the ECM — the sensor is plug-and-play and does not require separate calibration. The HX55 (early DD15) has no electronic components and requires no scan tool. Neither turbo requires actuator calibration like Holset VGT units do.
By the Detroit part number on the old turbo. The B3G variants use A-prefix numbers (A4720901480, A4720901880, 4720902780); the HX55 uses 2836376. If the dataplate is unreadable, the Detroit engine serial number identifies the correct variant. Send us either identifier and we confirm the match.
All units are 100% brand new. No rebuilt cores, no core charge. New CHRA, new wheels, new wastegate, new speed sensor (B3G). Balanced and OEM-spec. One-year warranty.
Yes. Cascadia fleet operations are core DD15 turbo customers. Consistent wholesale pricing from US stock. See the wholesale page.
Detroit DD15 Turbocharger Guide
The DD15 powers more Class 8 trucks than any other engine in North America. Its turbo system has evolved across production years, and knowing which era your truck belongs to is essential for ordering the right replacement.
DD15 Turbo Generations
| Era | Turbo | Manufacturer | Type |
|---|---|---|---|
| EPA10 (pre-2015) | HX55 (2836376) | Holset | Fixed geometry, wastegated |
| 2015-2018 | B3G (A4720901480) | BorgWarner | Wastegated with speed sensor |
| 2018+ | B3G (A4720901880 / 4720902780) | BorgWarner | Updated wastegate calibration |
Why the DD15 Switched From Holset to BorgWarner
The DD15 is a Daimler engine (based on the Mercedes-Benz OM 471), and Daimler transitioned its turbo sourcing from Holset to BorgWarner as the engine evolved through emissions tiers. The B3G brought a more compact package with an integrated speed sensor for improved ECM turbo monitoring. Both turbo eras are wastegated designs — the DD15 does not use a variable geometry turbo like the Cummins ISX or the earlier Detroit Series 60.
B3G Part Number Splits
The B3G changed part numbers across DD15 production years. The A4720901480 covers 2015-2018 Cascadias rated at 455-560HP. The A4720901880 and 4720902780 cover 2018 and newer trucks with updated wastegate calibrations. These part numbers are not interchangeable across years — the wastegate actuation pressure and turbo speed sensor calibration differ. Always match by the Detroit A-prefix part number on the old turbo.
DD15 Turbo Failure Patterns
- Wastegate actuator wear — The B3G uses a vacuum-operated wastegate actuator that controls boost pressure. Over time, the actuator diaphragm or linkage wears, causing inconsistent boost control. Symptoms include boost fluctuation under load and check engine codes related to turbo performance.
- Bearing wear at high mileage — Both the HX55 and B3G fail from bearing wear as the truck accumulates mileage. Shaft play develops, oil consumption increases, and eventually the turbo makes noise or the wheels contact the housings.
- Speed sensor failure (B3G only) — The integrated turbo speed sensor on the B3G can fail independently of the turbo. Before condemning the entire turbo for a speed sensor code, check the sensor and its wiring first — replacing only the sensor is significantly cheaper than replacing the full turbo.
Installation Notes: DD15
The DD15 turbo is accessible from the top of the engine on the Cascadia. Remove the charge-air piping, exhaust connections, oil feed and drain lines, and the turbo mounting bolts. Before installing the new unit, flush the oil feed line and inspect the oil drain path for restriction. On the B3G, connect the turbo speed sensor harness and verify the connector seats fully — a loose speed sensor connector will set fault codes immediately. Idle the engine for several minutes after installation to establish oil pressure before loading the engine.
