ficm cold vs hot - Ford Powerstroke Diesel Forum
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 4 Old 04-15-2012, 07:20 PM Thread Starter
Join Date: Oct 2007
Posts: 39
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
ficm cold vs hot

i have another question about about my ficm its has me asking why. I have a 2006 f250 diesel in the morning the temp outside is say in the 50's i have a cts monitor the voltage will say any where from 45-47 with the key on no start. As im cranking it over the voltage is still 45-47. Now when its starts the voltage drop fast to about 38-40 after 30 seconds it come back up 48.5 to 49. Its the orginial ficm the truck has 53000 miles. now when the engine is warmed up key on no start the voltage is again 45-47 start it up the voltage is 46-48.5 why does it do it when its cold but not when its warmed up. The battery are good voltage is 12.3 after start up. I was told the ficm is bad by some guys on here saturday but i dont understand why its doesnt do it when the engine is warm up only when the engine is col. thank again guys for all the help
mastaking is offline  
Sponsored Links
post #2 of 4 Old 04-15-2012, 09:06 PM
Dwilcox's Avatar
Join Date: Feb 2011
Location: East of Seattle
Posts: 81
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
It has to do with the internal power supply in the FICM. My 06 was doing the same thing but dropped as low as 30V on cold mornings. Finally set off the check engine light and set injector voltage low codes so the dealer warranty it.
I was lucky, 1 month till the warranty expired. Next one will be on me and it will be the soon to be released one from BPD.
The new OEM that was installed has held steady at 47.5V - 48V no matter the temp. for the last year that it has been in. about 8000 miles or so.
Replace it before you fry your injectors or it will cost you a bundle more to replace some of them too.
Good luck.

2006 Lariat FX4 PSD
Glowshift 3 in 1 Pyro, Trans, Boost.
EDGE Evolution CS
Fuel Pressure Spring
Upfitters,#2 Heated mirror, #3 High Idle, #4 GlowShift Dimmer
Fan Mod
Things to do!
Banjo Bolts (Have)
Fuel pressure Gage (Edge?)
Upfitter uses, #1 ?, (? = Ideas wanted)
Others, of course
Dwilcox is offline  
post #3 of 4 Old 04-16-2012, 07:59 AM
Compression Ignition Addict
Join Date: Jul 2010
Location: Richmond, IN
Posts: 483
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
Need a new one. Mine was doing the same thing, put a new power supply(half shell) and its back at 48 volts now all the time.

06 F-250 4X4
08 rear bumper and taillights,
Shaeffers 9000 5w40 don't use in your 6.0
GOGO direct solenoid, 08 tranny pan and filter
Edge CTS w/EGT probe.ARP 4" silverline,
fuel pressure reg upgrade, coolant filter, pre-pump spin on fuel filter, ELC,Oil bypass
SCT custom tunes by Vivian@QT and Matt @GH
4440 Front, 3040 rear, 7480 gross. VXCF4
worldwide73 is offline  
post #4 of 4 Old 04-16-2012, 08:18 AM
Compression Ignition Addict
jimmyv13's Avatar
Join Date: Jul 2007
Location: West Bloomfield, MI
Posts: 1,709
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 3
Thanked 4 Times in 4 Posts
Feedback Score: 3 reviews
Send a message via AIM to jimmyv13 Send a message via Yahoo to jimmyv13
Yup, it's going out....

send it to Ed at

2005 F250 CCSB Lariat FX4

4" MBRP Turbo Back*High Idle*Blue Spring*Updated Stand Pipes, Dummy Plugs*SGII w/Blendmount*Sinister Coolant Filter*SRL+*'10 Tailgate*2" level*Dicad EGR delete*Premium EdFICM*Powerslot Rotors*Hawk Pads*Riffraff boots*DIY CCV*4" Rear Blocks*ARP's*'10 Tails*Archoil*N-FAB Steps*'12 Rear Bumper*Dashboss*'08 Trans Pan
*Bullitt y-pipe
jimmyv13 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome