Hello everyone,

I have a 2014 F-250 Power Stroke 6.7 diesel that I recently did some work to. I did a complete EGR/DPF delete and tune using EZ LYNK and I have the 5 position, tune on the fly switch. I also did a DPK and the CCV reroute. All if this work was done at the same time. After the work was done and the tune flashed, I keep getting a P1556 code. This code was not present prior to the delete work and tune. The truck does not miss, does not smoke, and does not lack power. Looking at what EZ LYNK's dashboard offers, the injector pressure D and A are a very close match while driving. I took it to a guy with a high end scanner and the only issue he could find is that particular code. Injectors, power balance, etc. all tested good. I purchased FORScan and put all the injectors on the dashboard. Numbers all appear to be similar to each other while running. Besides that particular code, I cannot seem to find the issue. I can clear it, run the truck with no check engine light only to see it pop back up the next time I start it.

Background on the truck is that I bought it used. 60,000 miles ago, it had a CP4 failure so the entire fuel system was replaced under warranty. I called the Ford dealership to find out if they would replace the injector under warranty and their response was "since it's deleted, it's a case by case basis". I just don't want to spend more money with them ($149 for diagnosis) only for them to tell me Ford won't warranty it.

Has anyone experienced this code/issue before? The biggest thing is, I can't seem to pinpoint exactly what is causing it. I don't lack power, everything that I've looked at or had someone else look at indicates that the injector is good. I know someone mentioned the wiring or ECM - but I didn't have this code before the delete and tune. EZ LYNK doesn't believe it's anything in the tune because they tune 100's of trucks a week.

Any input is greatly appreciated. Thanks in advance.

 

Either wiring, a bad MAP sensor (one on the intake gets clogged with soot) or there is a boost leak somewhere. But considering the stories I hear from our diesel shop customers it could very well be the tune. Most of them are absolute crap and cause more issues than they solve. Our coworker has a Dmax that has had at least 4 different tunes in it over the last 2 years and each one had a different problem. I used to drive tow truck and our 19 F550 was deleted due to DPF issues. It had consistent hard starting and extended crank issues. Smoked something fierce and the injector noise was ridiculous. All the tunes nowadays come from out of country, mostly Alberta, Canada because of EPA crackdown. If there is no physical or electrical problem, find a different tune.

-Dan F

 

Thanks for the reply Dan. The mechanic that scanned it seems to agree with you, that it's in the tune. He said he has seen a tune work on multiple trucks and throw a code for some reason on a different truck. I've tried to relay that to the tuner and they've been responsive to my messages so hopefully the issue can be found in the tune itself. I'll pull the connectors from the ECU again, clean them again, and put some dielectric grease on them (again) just to make sure they are clean.

Thanks again.