Low Circuit on all 8 Cylinders - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 09-16-2019, 08:16 AM Thread Starter
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Low Circuit on all 8 Cylinders

Changed my oil this weekend and within 100 miles of driving my check engine light came on. Thought maybe it had to do with the oil change, but when I checked the codes (P0261, P0264, P0267, P0270, P0273, P0276, P0279, P0282) it was a low circuit on all 8 cylinders. The truck is running EXACTLY as normal. No long crank, no misfiring, absolutely nothing is different. I tried clearing the codes and they all came back the following day. All 8 injectors were replaced 3 years ago so I can't imagine it's an injector issue. Batteries are both 1 year old and I just replaced the alternator 2 weeks ago. The alternator was failing for about a week before I replaced it so I'm not sure if that has anything to do with it. ICP seems like it may be low but never monitored it before so I don't know what it was prior. 1.1 at idle and 1.5/6 at 2000 rpm. According to my sct the FICM is reading 48.0v key on and 31/32v at idle. All the threads that I have read related to this issue all have cold starts or rough idling. I guess that may come for me, but right now everything is normal. Any thoughts or recommendations?
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post #2 of 6 Old 09-16-2019, 02:24 PM
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Your FICM is bad
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post #3 of 6 Old 09-16-2019, 02:56 PM
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You can replace just the output board
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post #4 of 6 Old 09-16-2019, 03:49 PM
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Yeah - hopefully he corrects the issue instead of WAITING until it NOTICEABLY affects performance of the injectors!
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post #5 of 6 Old 09-16-2019, 04:54 PM Thread Starter
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Originally Posted by bismic View Post
Yeah - hopefully he corrects the issue instead of WAITING until it NOTICEABLY affects performance of the injectors!


So I just replace the main power supply? Any reason to go with a 58v?


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post #6 of 6 Old 09-16-2019, 06:33 PM
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IMO do not go w/ 58 volts. Unnecessary and IMO it can cause more wear and tear on the spool valve solenoids.
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dtc codes , ficm , ficm powerstroke 6.0 , injector issue

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