Hey All,

About a year ago, my dad had this code come up on his truck. I cleared the code for him and it never returned. This week, I had this code come up on my 2015. No other codes, no drivability concerns. So, I cleared the code knowing this is a phantom issue that ford hasn't done much to address. It stayed off a day or two and now it is back on. I was wondering if anyone has accurately diagnosed this issue? I've checked air filters (they were clean), connectors, etc. and didn't see anything that would lead me to believe there is an issue. I know some people's has turned out to be a nox sensor in the exhaust. Any ideas on where I should start besides the items I did? I'd like to get this thing taken care of.

Thanks!
Jeremy

p.s. I am still under warranty, but there is no dealer near me, so that isn't an option.

 

Try this: https://www.ford-trucks.com/forums/1...ode-p0170.html

I STILL have had no p0170 since I removed prefilter.

 

Since you appear to be under warranty yet, why not just bring it in? I personally wouldnt remove the pre-filter as the fix. But would be good info to let the tech know as part of his diagnostic info.

 

Had the same issue last summer while in CO.
There is a TSB (16-0134) for this code. The dealer in CO flashed my PCM to the latest update and I haven't had it reoccur yet.

 

 

 

Check this thread as well:
P0170

P0170 started showing up for me in November. I haven’t driven it much in the last 5 weeks, but I did throw it again the day I parked it. I haven’t done anything further to troubleshoot.

I am not running a prefilter as I’m running an aFe intake.

 

Gotcha!

 

I will add what little I can to this thread if it helps anyone pinpoint this issue.

I received the P0170 code within 10 miles of changing my air filter. Truck had 11,878 miles at the time of the filter change. This was the first time my truck had a check engine light occur since leaving the factory, no driveability issues and no other DTC's only the P0170.

The air filter was not filthy dirty but for $20 for an OEM filter I swapted it out for a new one anyway. I pulled a little harder than necessary on the MAF sensor connector during removal until I realized there was a lock that required pulling forward before the connector could be removed. My first thought was I disturbed that connection. I reset the code and double checked that the MAF connector was connected properly and wiggled the harness a bit at that connector. Engine light remain off until 2 days later.

Did some searching on FTE about this code and it appears others have commented that this issue could have to do with the MAF sensor, wires, connector or intake area. This concurs with what I have observed as this is same area I disturbed while changing the air filter.

I recently took a long trip over the Christmas holliday in which the engine light returned a total of 3 times during the 4000 mile trip. There was no consistancy when the code returned, warm weather, cold weather, high wind, no wind, snow, rain, etc. The returning of the code was random, some times it would trigger after 300miles of driving, other times it would trigger after entering the interstate just after a restart at a fuel stop.

I was hopping the light would return since the last reset (over 1000 miles ago) since I have an appointment for an upper oil pan leak repair at the dealer next week.


Like some others have stated, it seems like a threashold is too low and sets this code.



I also did a search for the P0170 DTC in my service manual and found the following:

 

Just returned from the dealership who addressed the issue for me. Will post back if the dtc returns in the future.







02/03/17 NHTSA ID: 10090462
TSB ID: TSB 16-0134

Some 2015-2016 f-super duty vehicles equipped with a 6.7l diesel engine may exhibit an illuminated mil with dtc p0170 (fuel trim bank 1) stored in the powertrain control module (pcm) memory. reprogram the pcm to the latest calibration using