This is the Alliant Power AP65122N, a fuel injection control module (FICM) remanufactured by Alliant Power for the 2003 Ford 6.0L Power Stroke in F-Series Super Duty trucks and the Excursion, engines built before 9/22/2003. It comes pre-programmed, so it does not need dealer programming for the trucks it is listed for. It replaces Ford 4C3Z12B599ABRM. This number is sold with no core, so there is nothing to send back. The same module sold with a refundable core is AP65122.

A weak FICM shows up as hard cold starts, a rough or stumbling idle until the engine warms up, a miss under load or a crank with no start. Low battery or charging voltage does the same thing and is what kills these modules, so load test both batteries and check the alternator before you fit a new one. Stuck injector spool valves on a cold engine can look like a bad module too.

Specifications

Fits / Applications

• 2003 Ford F-250, F-350, F-450 and F-550 Super Duty, 6.0L Power Stroke, engine built before 9/22/2003
• 2003 Ford Excursion, 6.0L Power Stroke, engine built before 9/22/2003
• Engines built on or after 9/22/2003 take AP65123. 2005 to 2007 trucks take AP65124.

Disconnect both batteries before you unplug the module. Check the harness connectors for bent pins and oil, and fix weak batteries or a weak alternator first, because low system voltage is the usual reason a FICM fails.

Part Numbers & Cross Reference

Alliant Power AP65122N  ·  Ford 4C3Z12B599ABRM  ·  Ford 4C3Z-12B599-AB  ·  Alliant Power version with core AP65122

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Does the AP65122N need to be programmed?

No. It comes pre-programmed for the 6.0L Power Stroke it is listed for. Pick the number by engine build date.

How do I know whether my truck takes the AP65122N?

Go by the engine build date on the engine data sticker. This number is for engines built before 9/22/2003. Engines built on or after that date take AP65123, and 2005 to 2007 trucks take AP65124. If you are near a changeover date, call 530-668-0818 with your VIN.

What Ford number does the AP65122N replace?

It replaces Ford 4C3Z12B599ABRM, also written 4C3Z-12B599-AB.

Is it new or remanufactured, and is there a core?

It is remanufactured by Alliant Power. This number is sold with no core, so there is nothing to send back. The same module with a refundable core is AP65122.

Related Parts

• 2003 Ford 6.0L Power Stroke FICM (Engines Built Before 9/22/2003) | Alliant Power AP65122 Remanufactured
• 2003-2004 Ford 6.0L Power Stroke FICM (Built 9/22/2003 and Later) | Alliant Power AP65123 Remanufactured
• 2003-2004 Ford 6.0L Power Stroke FICM Control Module | Alliant Power AP65123N Remanufactured (No Core)
• 2004-2007 Ford 6.0L Power Stroke & VT365 EGR Cooler Kit | Alliant Power AP63446 New

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.