ALLIANT POWER AP55504 REMAN COMMON RAIL INJECTOR – GM® 6.6L DURAMAX LLY
The Alliant Power AP55504 remanufactured common rail injector is designed for 2004.5-2005 GM® 6.6L Duramax LLY diesel engines used in Chevrolet®, GMC®, Kodiak®, Topkick®, and related medium-duty applications.
Duramax injectors operate under extremely high fuel pressure and precise injection timing requirements. A worn or failing injector can lead to hard starts, excessive smoke, rough idle, fuel knock, poor fuel economy, loss of power, balance rate issues, or engine misfires.
The AP55504 injector is remanufactured using OE tooling and processes, with critical wear components replaced using genuine Bosch® parts. Each injector is thoroughly end-of-line tested to OE-equivalent specifications for leakage, injection timing, pulse width response, and fuel delivery performance.
Designed for demanding diesel environments, this injector is built to help restore factory-level fuel system performance and drivability.
Features & Benefits
- Remanufactured common rail injector for GM® 6.6L Duramax LLY engines
- End-of-line tested to OE-equivalent specifications
- Tested for internal and external leakage
- Injection timing and delivery verified during testing
- Built using OE tooling and manufacturing processes
- Critical wear components replaced with genuine Bosch® parts
- Helps restore power, fuel economy, and injector balance performance
- Designed for demanding diesel operating conditions
Common Symptoms of a Failed Injector
- Rough idle
- Excessive smoke
- Hard starting
- Fuel knock
- Injector balance rate issues
- Loss of power
- Poor fuel economy
- Engine misfires
Included in the Box
- 1x Remanufactured Injector
- 1x Chamber Nozzle Tip Gasket
- 2x Injector Sealing O-Rings
Specifications
- Brand: Alliant Power
- Part Number: AP55504
- Condition: Remanufactured
- Product Type: Common Rail Fuel Injector
- Gross Weight: 1.581 LB
- Country of Origin: USA
- UPC: 843497106936
- Reference Number: APP41179
- Core Item Number: COR65203
Compatible Applications
Fits select:
- 2004-2005 Chevrolet® Silverado 2500 / 3500 (6.6L Duramax LLY)
- 2004-2005 GMC® Sierra 2500 / 3500 (6.6L Duramax LLY)
- 2004-2005 Chevrolet® Kodiak (6.6L Duramax LLY)
- 2004-2005 GMC® Topkick
- Hummer® H1 Alpha applications
- VIN Code: 2
⚠ Please verify fitment using your vehicle information, VIN, and part number before purchase.
Cross Reference Numbers
For identification and compatibility reference only:
0 445 120 027, 0 986 435 504, 0 986 435 504RX, 0445120027, 0-445-120-027, 0986435504, 0-986-435-504, 0986435504RX, 0-986-435-504RX, 0986435504X, 0-986-435-504X, 2411300005, 241-130-0005, 2900714000, 2-90071-400-0, 2J102, 2J-102, 504, 504RXPLAN, 732501, 732-501, 7838GN, 7838-GN, 8973036572, 8-97303-657-2, 90071400, 97303657, 97780144, DA2251041, DE665, DT660002R, DT97303657R, EC631046, FJ489, FJ-489, R986435504
Core Charge Information
⚠ Refundable Core Deposit Required:
- $100.00 Core Charge Per Injector
Core must be returned according to supplier core return requirements to qualify for refund.
Warranty
Warranty Coverage:
- 12 Month Unlimited Mileage Warranty
Warranty applies against manufacturing defects in material and workmanship.
California Diesel Note
California Diesel supplies diesel fuel system and engine-related components for light-duty, medium-duty, and heavy-duty diesel applications. We focus on practical support, dependable inventory, and diesel-focused service for repair shops, fleets, and diesel professionals.
Legal Compliance
⚠ Legal Compliance: This product is not endorsed by or affiliated with Bosch®, Chevrolet®, GMC®, Duramax®, Hummer®, General Motors®, or any other brand mentioned. Trademarks are used only for compatibility and identification purposes.
⚠ California Proposition 65 Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
