Product Description
Restore precise common-rail control on your LLY with the INDUSTRIAL INJECTION 0928400653-IIS GM Fuel Control Actuator (FCA). This direct-fit metering valve mounts on the CP3 pump and stabilizes commanded rail pressure for clean starts, steady idle, and crisp throttle response on 2004.5–2005 6.6L Duramax LLY trucks.
Fitment
- 2004.5–2005 GM 6.6L Duramax LLY (Silverado/Sierra 2500HD/3500HD) — CP3-equipped
What’s Included
- (1) Fuel Control Actuator (FCA) for CP3 pump — 0928400653-IIS
Why Choose This FCA
- Direct replacement for the LLY CP3 metering valve (no tuning required for stock hardware)
- Restores rail pressure control to address surge/lope and low-power symptoms linked to a worn FCA
- Built for OE-level reliability from a trusted diesel fuel system specialist
Recommended Parts (CPP Internal Links)
- GM DURAMAX CP3 PUMPS & COMPONENTS — pumps, lines, seals, and hardware
- S&S NEW LBZ-BASED CP3 (Fits 2001–2010 LB7/LLY/LBZ/LMM) — high-quality replacement/upgrade
- DURAMAX FUEL FILTRATION — protect the CP3/FCA with fresh, high-flow filtration
- EXERGY 2400-BAR RACE PRV — competition builds only (helps maintain rail pressure under load)
- SHOP ALL GM DURAMAX CATEGORIES
Helpful Notes
- If you still see rail pressure codes after replacement, inspect lift-pump supply, filter condition, and CP3 health.
- Clear DTCs and verify commanded vs. actual rail pressure in live data after install.
FAQ
What does the FCA do on an LLY?It meters fuel entering the CP3 to control rail pressure. A failing FCA can cause surge/lope at idle, hard starts, or sluggish response.
Is tuning required after installing this FCA?No. For a stock CP3 and injectors, replacement is plug-and-play. If you’ve upgraded major fueling components, confirm calibration.
How do I confirm the FCA is my issue?Scan for rail pressure deviation codes and compare commanded vs. actual pressure. If filtration and supply are good, the FCA is a common culprit.
Will this fit other Duramax generations?This specific part targets the 2004.5–2005 LLY. For other generations, shop our CP3/CP4 categories to match your year/engine.
