Fuel Injector Control Module (FICM) Problems and Repair | UpFix

Why Is My Semi-Truck Misfiring or Hard to Start?

The Fuel Injector Control Module (FICM) powers and times your injectors. When it weakens, the engine struggles to start, misfires, or lacks power—especially in cold conditions.

Symptoms of a Bad FICM

• Hard start when cold

• Rough idle or cylinder misfire codes

• Low injector voltage (under 45V)

• Poor acceleration or reduced fuel economy

Over time, vibration and heat cause solder joints to crack and capacitors to fail. This leads to voltage loss and injector misfiring.

Why Repair Makes Sense

Dealers often replace FICMs unnecessarily. New units can cost thousands, and used ones rarely match your engine calibration. UpFix restores your existing module by replacing all high-failure components with automotive-grade upgrades.

The UpFix Repair Process

1. Diagnose and verify voltage drop.

2. Replace failed power drivers and capacitors.

3. Test output under simulated injector load.

4. Seal board against vibration and temperature stress.

Your repaired FICM returns fully functional, plug-and-play, and ready to start strong even in cold weather.

Supported Trucks

Freightliner, International, Peterbilt, Volvo, and Mack models and others.

Get your truck back on the road and keep your costs low.
Send your part to UpFix for professional testing and repair.
We’ll restore it to like-new condition, save you up to 80% compared to buying new, and make it plug-and-play ready when returned.