Saihisday Fuel Injection Control Module Repair Kit for 6.0L Powerstroke — Board Replacement with OEM Connector Fit

Saihisday's Fuel Injection Control Module (FICM) repair kit replaces the faulty board in 6.0L Powerstroke engines to restore reliable injector performance and engine operation.

If your 2003–2007 Ford 6.0L truck or 2003–2005 Excursion is showing poor injector response, rough idle, or intermittent starts, the FICM is a common culprit. This Saihisday replacement kit matches factory-fit connectors and replaces the internal control board for models that use part numbers such as 904-229, 3C3Z12B599AARM and 1845117C2. The kit is created to be a practical repair option for owners and technicians who prefer restoring the existing module instead of buying a complete factory unit.

Which vehicles and part numbers does this FICM repair kit fit?

This kit is intended for Ford Powerstroke 6.0L applications including F250, F350, F450, F550 (2003–2007), Excursion (2003–2005), and select E-Series vans (E-350, E-450). Before ordering, verify the part number on your existing module.

• Replaces: 904-229, 3C3Z12B599AARM, 4C3Z12B599AARM
• Also compatible with: 4C3Z12B599ABRM, 4C3Z12B599BARM
• OEM cross-references: 1845117C2, 1845117C6, 5010121R94
• Year coverage: primary 2003–2007 6.0L Ford diesel applications

How does installing this repair kit affect injector performance?

The repair board replaces worn electronics inside the FICM so it can reliably supply voltage pulses to the injectors. Restoring stable control signals helps improve starting repeatability and reduces erratic injector behavior without altering engine tuning.

• Restores consistent injector drive voltage
• Reduces intermittent misfires and rough idle
• Keeps OEM connectors and mounting points intact
• Designed for direct board-level replacement inside the existing module housing

What should a technician check before purchasing this kit?

A quick inspection of the FICM part number, connector type, and external damage will confirm compatibility. Also check vehicle battery/charging system health, as low system voltage can mimic FICM failure; the kit fixes internal electronics, not external electrical faults.

• Compare part number on module to the listed replacements
• Confirm physical connector and mounting match your module
• Test battery voltage and alternator output first
• Inspect for water intrusion or severe corrosion that may need housing replacement

What tools and skills are required to perform the repair?

Board replacement requires basic electronics handling skills and common hand tools. Technicians should use anti-static precautions and follow safe disassembly steps to avoid damaging the new board or surrounding components.

• Basic hand tools (screwdrivers, sockets) and a torque wrench
• Anti-static wrist strap or ESD-safe workspace recommended
• Careful removal of the module from the vehicle to prevent connector damage
• Reassembly and verification run before road testing

Who is this for: The Saihisday FICM repair kit is aimed at professional mechanics and experienced DIYers who want a cost-effective fix for 6.0L Powerstroke injector control problems. It suits owners of Ford F250–F550 trucks, Excursions, and E-Series vans who have identified the FICM as the issue and prefer repairing the module rather than replacing the entire unit. Always confirm the module part number and inspect the vehicle's charging system prior to purchase to ensure this kit is the right solution for your repair.