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The Cummins QSB6.7 Engine Control Module (ECM) 4921776 (often with CM850 or CM2850 platforms) is a crucial, high-performance controller for QSB6.7 diesel engines, managing fuel injection, emissions, and engine protection. This OEM part is commonly used in heavy-duty Komatsu construction equipment (e.g., PC200-8, WA470-6) and marine applications. New units typically require programming via the Engine Serial Number (ESN) before installation.
Key Specifications & Features
- Part Number: 4921776 (Also listed as 4921776RX, 4921776NX, 4921797).
- Engine Model: Cummins QSB6.7 (often CM850 platform).
- Applications: Komatsu excavators (PC190-8, PC200-8, PC300LC-8M0, PC400-8, PC450-8), loaders (WA470-6, WA430-6), and bulldozers (D85PX-15R, D65EX-15E0).
- Functions: Controls fuel injection timing/quantity, emissions, and engine protection.
- Condition: Available as new genuine OEM or remanufactured (4921776R).
Purchase & Installation
- Pricing: New units generally range from $900 to over $1,500.
- Programming: The ECM requires programming before installation to function properly with the specific engine.
- Where to Buy: Available from specialized retailers such as FridayParts.com, Advanced Truck Parts, and First Truck Parts.
- Interchangeability: Commonly compatible with QSC8.3, QSK19, QSK50, and other Cummins engines.
Common Issues & Maintenance
- Failure Symptoms: Engine stalling, failure to start, or erratic performance due to faulty internal circuitry.
- Troubleshooting: Requires diagnostics to verify the unit is not transmitting signals.
- Repair Services: Specialized services (e.g., ECM Repair USA) are available to test and recondition units.
For the best performance and compatibility, it is essential to check the engine serial number (ESN) and match it with the specific part number before purchase. Would you like to check compatibility for a specific Komatsu machine or Cummins engine application?
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Cummins QSB ECM 4921776
GoECM
https://goecm.com › All › Cummins QSB ECM 4921776
GoECM
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Cummins QSB ECM 4921776 remanufactured engine control module with a lifetime warranty. Programming included. In stock, ready to ship.
Missing: QSB6. ‎7
Cummins 4921776 ECM | ISB ISC ISL CM850 | Used As-Is
All Pro Truck Parts
https://www.allprodiesel.net › Cummins › Used Parts
All Pro Truck Parts
https://www.allprodiesel.net › Cummins › Used Parts
This is a used genuine Cummins 4921776 Electronic Control Module (ECM) for ISB, QSB6.7, ISC, and ISL diesel engines on the CM850 control platform.Read more
$299.99In stock3-day deliveryLifetime returns
LHCBSOK ECM ECU 4921776 Electronic Control Module ...
Amazon.com
https://www.amazon.com › LHCBSOK-4921776-Electr...
Amazon.com
https://www.amazon.com › LHCBSOK-4921776-Electr...
Part Number: 4921776; Part Name: Electronic Control Module; Application: Fit for Cummins QSB6.7 Engine. See more. Product specifications ...Read more
4921776 Engine Control Module for Cummins QSB6.7 ...
eBay
https://www.ebay.com › itm
eBay
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782.04 USD. Free shipping · Engine Control Module for Cummins QSB6.7 Engine 4921776 D65EX-15E0 ECM ... Electronic Control Module , Engine Control Module ECM , ...Read more
Control Module ECM With Program 4921776 for Cummins ...
FridayParts
https://www.fridayparts.com › control-module-ecm-wit...
FridayParts
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Struggling with engine issues? This 4921776 ECM could be exactly what you need! Programming included. 12-month warranty. Ready to ship. Order now.
Cummins QSB6.7 Engine Computer Module, ECM, ECU ...
eBay
https://www.ebay.com › itm
eBay
https://www.ebay.com › itm
Supersession P/N: 4921776. (GOOD USED/ TESTED)OEM 2011 Cummins QSB6.7 Diesel Engine Computer Module, ECM, ECU, for sale! Model: QSB6.7.Read more
$750.00In stock$22.37 delivery
QSB 6.7L Marine Cummins ECM Repair Service | 4921776
ecmrepairusa.com
https://ecmrepairusa.com › Shop › CUMMINS
ecmrepairusa.com
https://ecmrepairusa.com › Shop › CUMMINS
QSB 6.7L Marine Cummins ECM Repair Service | 4921776. Your ECM will be returned fully reconditioned, tested, and ready to be installed.
$517.00In stockFree delivery15-day returns
ECM 4921776 Engine Control Module Unit 4921776RX ...
eBay
https://www.ebay.com › ... › Other Engine Parts
eBay
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4921776 Engine Control Module 4921776RX ECM Fits For Cummins QSB6.7 4921776NX US. Application: For Komatsu Engine SAA6D114E-3A Excavator PC300LC-7E PC400LC-Â ...Read more
6D107 QSB6.7 Engine Control Module ECM 4921776
Listen-Autoparts.com
https://www.listen-autoparts.com › 6d107-qsb6-7-engin...
Listen-Autoparts.com
https://www.listen-autoparts.com › 6d107-qsb6-7-engin...
6D107 QSB6.7 Engine Control Module ECM 4921776. Product Origin: CHINA. Item NO.: 4921776. Shipping Port: XIAMEN PORT. Lead Time: 3-5 WORKING DAYS.Read more
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JustAnswer
https://www.justanswer.com › medium-and-heavy-truck
JustAnswer
https://www.justanswer.com › medium-and-heavy-truck
Apr 29, 2025 — For startup issues with the Cummins QSB 6.7 ECM (P4921776-RX), verify all ECM pin connections per the official pinout to ensure proper signal ...Read more
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People also ask
How much is the Qsb6 7?
Description: Premium Remanufactured Cummins Qsb6. 7 Complete Diesel Construction - Engine, Starting At $19995.00 Exchange With One Year Or 2,000 Hrs.
CUMMINS QSB6.7 Engine For Sale - 51 Listings | MachineryTrader.com
Machinery Trader
https://www.machinerytrader.com › cummins › qsb6-dot-7
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What does QSB stand for Cummins?
QSB engine
The 5.9 L QSB (Quantum System B) is an off-road, heavy duty version of the ISB. Typically used in marine, agricultural, and construction applications, these engines share many of the same parts as the ISB and utilize the same Bosch fuel system.
The 5.9 L QSB (Quantum System B) is an off-road, heavy duty version of the ISB. Typically used in marine, agricultural, and construction applications, these engines share many of the same parts as the ISB and utilize the same Bosch fuel system.
Cummins B Series engine - Wikipedia
Wikipedia
https://en.wikipedia.org › wiki › Cummins_B_Series_eng...
Wikipedia
https://en.wikipedia.org › wiki › Cummins_B_Series_eng...
What is a QSB 6.7 Cummins?
The QSB 6.7L Cummins is used in many applications including yard tractors and several types of industrial equipment, for model years 2007-2013. Reviva utilizes torque plating methods for boring and honing to ensure cylinders are straight and round, which reduces break-in time and crankcase pressure.
Cummins QSB 6.7L HP Common Rail Diesel Engine - Reviva
Reviva
https://www.reviva.com › diesel-engines › cummins-qsb-...
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