What a Failing FICM Looks and Sounds Like. When you aren't getting 48-volts to the injector coils you get: hard starts, rough idle, loss of power, poor drivability, and excessive smoke out the tailpipe—and in cold weather each of those symptoms will be amplified.
Does a Duramax Ficm have to be programmed?
Registered. From my research, the FICM does not appear to need programming(but I read this on the internet, soooo..).Nov 1, 2018
Will bad Ficm cause no start?
As it relates to the FICM, there are a few other symptoms to mention. One would be a complete no start situation where the engine cranks over, but will not run. This may be related to either a completely failed power supply side of the FICM (20 volts or less output), or in some rare cases a failed logic side.
What happens if ECU fuse is blown?
Voltage from the battery is sent to the starter, which then engages and starts the engine. The voltage or amps surge, causing the ECM 1's fuse to blow. When the starter fails you will hear a clicking noise or the engine will be hard to start.
What is the ECM fuse?
The ECM 1 is one such computer; it has a fuse is installed to protect the computer from sudden power surges or other component damage -- the fuse will blow before any damage can reach the ECM. Many component defects can cause your ECM 1 fuse to blow.
Are lp5 Duramax reliable?
Duramax L5P Reliability The L5P is considered the most reliable post-emissions Duramax made to date. With the removal of the CP4. 2 fuel injection pump and various improvements made to the block, pistons, and other internals, the engine itself is extremely capable and reliable.
Why does everyone want a LBZ Duramax?
To support the power increase over the LLY model, the block was improved, the rods were forged, and the engine was overall built to withstand more power. Because of this, the LBZ is a favorite amongst diesel enthusiasts because of its bolt-on mod performance capabilities.Aug 4, 2020
How do I know if my Ficm is bad Duramax?
Have your assistant turn the engine key without starting the vehicle up. With the key ON, test the voltage. If the voltage is 46 or more, the FICM is fine. If it ever drops below 36, then something is seriously wrong with your FICM.