Code P0265 6.0 powerstroke
The Struggle Bus¯\_(ツ)_/¯
Joined: Jan 2022
Posts: 693
Likes: 307
Crap gets worse every time! Tore the engine down today and replaced the injectors on the driver's side. Put it back together, went to forscan to do a Buzz test to see how it is, and Im getting 2 new codes. U0105 and U0306. I called FICM repair, FICM Fixer and thoroughbred diesel and they all believe its the FICM relay, and ordered a new one, but all said it could be the ECM. Im over $1500 in this thing as of now, another $65 for the relay which is on order and wont have till Thursday. If that isnt it, then its the ECM and flagship one has them for $622, plus I think it needs to go to the stealership to get the PATS programed?
Thread Starter
|
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
Thank you to everyone for your help! Still not running. Im getting zero to FICM logic power. I was told to check FICM harness to ground(harness from FICM to injectors) how do I do that, but for $100 Ill just replace it rather than testing it. Does the harness from the ECM to FICM go bad? How do I check for power and/or ground from the ECM to the FICM?
So far Ive installed a new FICM, 4 new injectors, FICM relay.
Prior to the injectors, it ran still with one cylinder down. After i got nothing. I just realized in my head I should unplug one new injector or all them on the driver's side at a time and see if FICM logic power comes back(I guess one of the new injectors could be bad!?)
To the gentleman in Springfield, Id love your help if you dont mind? If after checking everything Id like to try your ECM before buying one. I always feel Im mechanically enclined and smart, but damn this has me puzzled. Would take any logic or ideas anyone else have?
Ive checked all the fuses connected to the ECM and FICM and all are good too. Thank you guys!
So far Ive installed a new FICM, 4 new injectors, FICM relay.
Prior to the injectors, it ran still with one cylinder down. After i got nothing. I just realized in my head I should unplug one new injector or all them on the driver's side at a time and see if FICM logic power comes back(I guess one of the new injectors could be bad!?)
To the gentleman in Springfield, Id love your help if you dont mind? If after checking everything Id like to try your ECM before buying one. I always feel Im mechanically enclined and smart, but damn this has me puzzled. Would take any logic or ideas anyone else have?
Ive checked all the fuses connected to the ECM and FICM and all are good too. Thank you guys!
Thread Starter
|
Laughing Gas
Joined: Mar 2019
Posts: 947
Likes: 144
From: Columbus Ohio
My truck is running again and runs PERFECT!
The gentleman 4KIDS told me to recheck all my FICM harnesses to make sure they were fully seated and locked. While they were all locked and seated in the front, the back to the harness on the wire loom that comes from the ECM was backed out about 1/4 inch on one side, i disassembled it, checked it all, reassembled, and used super glue to seal it so it cant back out, reinstalled and then zip tied it on both sides of the one harness in back, and all is good! Got it all back together and runs perfect. Thank everyone for their help.
The gentleman 4KIDS told me to recheck all my FICM harnesses to make sure they were fully seated and locked. While they were all locked and seated in the front, the back to the harness on the wire loom that comes from the ECM was backed out about 1/4 inch on one side, i disassembled it, checked it all, reassembled, and used super glue to seal it so it cant back out, reinstalled and then zip tied it on both sides of the one harness in back, and all is good! Got it all back together and runs perfect. Thank everyone for their help.
Hotshot
Joined: Apr 2010
Posts: 19,072
Likes: 242
From: Saratoga Springs,UT
glad it’s back up running
Almost everyone that posted in this thread mentioned check the harness it’s common with your particular DTC
I’ve been in you shoes before overlooking the small things just wanting it to run basically info overload and Where to focus
Almost everyone that posted in this thread mentioned check the harness it’s common with your particular DTC
I’ve been in you shoes before overlooking the small things just wanting it to run basically info overload and Where to focus
Last edited by BLADE35; Apr 17, 2026 at 10:15 PM.
Thread
Thread Starter
Forum
Replies
Last Post
