If you have a Chevrolet or GMC vehicle with a Duramax LLY or LB7 engine that wont crank or start, or you've got a U0105 DTC error code, the culprit could very well be a faulty Fuel Injection Control Module (FICM). The FICM is a critical component of the Duramax engine system, responsible for controlling the fuel injectors and ensuring proper engine performance. When this module fails, your vehicle won't start leaving you stranded and in need of a quick fix.

What is the Fuel Injection Control Module (FICM) in Duramax LLY and LB7 Engines?

The FICM receives signals from various sensors and uses this information to regulate the timing and amount of fuel injected into the engines cylinders. The FICM ensures that the engine runs smoothly, with the correct fuel-to-air ratio for optimal performance, efficiency, and power. If the FICM is not functioning or communicating properly with the rest of the vehicle, the engine is unable to run.

Common Symptoms of a Bad Duramax LLY or LB7 FICM

When the FICM in your Duramax engine malfunctions, you may notice several symptoms that indicate the need for repair. Some common issues include:

• Engine Wont Crank or Start: One of the most obvious symptoms is a failure to start the engine, even when the battery is charged. The FICM failure prevents the injectors from firing, preventing the engine from running.
• Engine Misfire or Rough Idle: A faulty FICM may cause the engine to misfire or run rough, especially when idling or accelerating.
• U0105 Code: The U0105 diagnostic trouble code (DTC) is common when the FICM fails. This code indicates that the ECM (Engine Control Module) has lost communication with the FICM.

What Causes a Duramax FICM to fail?

FICM failures in Duramax LLY and LB7 engines are often caused when internal components wear out. There are certain wear components in the module that become unstable with age. Because of all the variables, it is hard to pinpoint the exact time at which the FICM will fail, but unfortunately this failure is guaranteed to happen eventually. Perhaps the worst part is that buying a brand new module is often very expensive. They can cost thousands of dollars and then require programming to ensure compatibility with your vehicle. For this reason, the best option is to have your module repaired to address failures and restore full functionality to your FICM. We completely rebuild the module to not only fix your current issues, but also safeguard against future problems as well.

Why Rebuilding Your FICM is the Best Option

At Circuit Board Medics, we have developed a thorough process that addresses all known failures with the module. We rebuild the FICM within one business day of receiving it, then test the module after repair while preserving your original programming. This approach will save you a significant amount of time and money while also providing peace of mind. All repairs are backed by a one year warranty as well.

How to Get Your Duramax LB7 or LLY FICM Rebuilt

If you're ready to have your FICM repaired, its easy to get started. Simply visit one of the repair service links below or call us at (800) 547-2049 to speak with one of our technical experts. Well walk you through the repair process and answer any questions you may have.

• All FICM Repairs by Vehicle
• Chevrolet FICM Repairs
• GMC FiCM Repairs
• Hummer FICM Repairs

Conclusion

A faulty FICM in your Duramax engine can cause a range of issues, from the engine not starting to reduced performance. If you've encountered the U0105 code or are experiencing difficulties with your vehicles cranking and starting, don't wait to address the issue. Rebuilding your FICM is a cost-effective and reliable solution that can restore your vehicles functionality and prevent future issues.

At Circuit Board Medics, we offer expert FICM repair services backed by a one-year warranty, ensuring that your truck runs smoothly for the long haul. If you need professional assistance, contact us today and let us help you get your vehicle back on the road.