P139C and U0422 DTC

[Kyle Hammerton]

I had a 5 star tune loaded and started to feel like I wasn't getting throttle response off the line. So the first thing I did was remove the Tune back to my Stock file. The moment I loaded the stock file I got check engine lights and a couple DTCs. P139C and U0422. Also got notification in my FordPass app saying "Emission Control system has detected the exhaust gas recirculation pressure sensor signal is not as expected when the vehicle is idle." It definitely feels like it doesn't want to take off from a stop unless I really lay into the throttle. Also my Start/Stop has not come back on since set it back to stock. Has anybody seen or know anything about this?

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[Porpoise Hork]

P139C is a Ford only code.

Code P139C
Definition: EGR Sensor C Downstream Hose Off Or PluggedDescription:At idle, the exhaust gas recirculation (EGR) monitor commands the EGR valve closed and checks the differential pressure across the EGR tube orifice which should be zero to indicate the hoses are connected and not restricted. This DTC sets when the differential pressure indicated by the sensor exceeds a maximum threshold or falls below a minimum threshold.Cause:

• The downstream hose is disconnected
• The downstream hose is restricted
• Restricted or damaged EGR tube

U0422 - Invalid Data Received From Body Control Module

U0422 Possible Causes

• Faulty Body Control Module (BCM)
• Body Control Module harness is open or shorted
• Body Control Module circuit poor electrical connection

Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.


Try clearing the codes using Forscan or other code reader and see if they return, you can also try reload the tune as that will clear all codes in the system then back to stock. It is possible that the flash tool failed to properly clear the DTC codes when returning to stock causing these codes to be generated.

 

[Frenchy]

So just incase you were wondering 5 Star stands for 5 Star Garbage!!

There are plenty of reports on the forum that show 5 Star doesnt have thier shit together. Better yet they dont use barometric pressure compensation either wich is a big porblem if you travel a lot!! Its so bad that they have a separate tune for high elevation!!

Part of why I went with Livernois.

 

[Porpoise Hork]

So just incase you were wondering 5 Star stands for 5 Star Garbage!!

There are plenty of reports on the forum that show 5 Star doesnt have thier shit together. Better yet they dont use barometric pressure compensation either wich is a big porblem if you travel a lot!! Its so bad that they have a separate tune for high elevation!!

Part of why I went with Livernois.

No aftermarket tune is free from issues. Even the Livernois tune has had problems along the way. So before you go bashing the his choice of tune and what ever possible problems you think it has while praising a different one like a fanboy, perhaps read what he actually posted. His issues started AFTER he returned the truck to stock and not while it was running the tune.

 

[Frenchy]

No aftermarket tune is free from issues. Even the Livernois tune has had problems along the way. So before you go bashing the his choice of tune and what ever possible problems you think it has while praising a different one like a fanboy, perhaps read what he actually posted. His issues started AFTER he returned the truck to stock and not while it was running the tune.

Correction sir. His issue started with the tune. It wasn't until he put his duck tune back in that he got the check engine light. Did you pay attention to that part? I did. It is also been very consistent for five star to not have good tuning software for the Rangers and any other vehicle because it does not use the barometric pressure compensation like Ford does from the factory.

 

[Porpoise Hork]

Correction sir. His issue started with the tune. It wasn't until he put his duck tune back in that he got the check engine light. Did you pay attention to that part? I did. It is also been very consistent for five star to not have good tuning software for the Rangers and any other vehicle because it does not use the barometric pressure compensation like Ford does from the factory.

Precisely. Not until he flashed it back to stock is when the codes were generated. That clearly indicates the issue is either a failed return to stock flash, DTC codes failing to be properly cleared by the flash module he used when returning to stock, or an actual physical issue with the truck, as cited in my original response. Not one of those could be blamed directly on 5 Star. Yes, he stated it felt like he had a loss of throttle response when running the tune and that is why he returned to stock. No other information about drive ability concerns when running the tune were given. Nothing to indicate the tune is to blame here AT ALL.

As to your repeated claims, I have searched for any reported issues or documentation citing that 5 Star doesn't use barometric pressure compensation. The only hits that came up were from an RV forum from 2012 and several posts from yourself and one or two others on here. That's it... When asked to post data on this showing proof of this claim no response was ever given. Not by you, or anyone else. So until someone can actually provide proof then your claims are worthless. Yes there were some reported issues with entering limp mode VERY early on in the tune development this has since been resolved and reported on by those who had the problem and reached out to 5 Star and received updates to the tuning files.

 

[Frenchy]

Precisely. Not until he flashed it back to stock is when the codes were generated. That clearly indicates the issue is either a failed return to stock flash, DTC codes failing to be properly cleared by the flash module he used when returning to stock, or an actual physical issue with the truck, as cited in my original response. Not one of those could be blamed directly on 5 Star. Yes, he stated it felt like he had a loss of throttle response when running the tune and that is why he returned to stock. No other information about drive ability concerns when running the tune were given. Nothing to indicate the tune is to blame here AT ALL.

As to your repeated claims, I have searched for any reported issues or documentation citing that 5 Star doesn't use barometric pressure compensation. The only hits that came up were from an RV forum from 2012 and several posts from yourself and one or two others on here. That's it... When asked to post data on this showing proof of this claim no response was ever given. Not by you, or anyone else. So until someone can actually provide proof then your claims are worthless. Yes there were some reported issues with entering limp mode VERY early on in the tune development this has since been resolved and reported on by those who had the problem and reached out to 5 Star and received updates to the tuning files.

Lol apparently you dont know what it means to have drivability issues. Throttle response is one of the said symptoms. And perhaps you haven't looked on this forum well enough. 5 Star has a whole separate tune for those in high elevation. I promise you that it isnt a Hoax. When the OP got the tune installed the problems started. That right there already states the 5 Star has faulty software. If lucky the OP can clear codes and all is good but no promises.

 

[Kyle Hammerton]

Lol apparently you dont know what it means to have drivability issues. Throttle response is one of the said symptoms. And perhaps you haven't looked on this forum well enough. 5 Star has a whole separate tune for those in high elevation. I promise you that it isnt a Hoax. When the OP got the tune installed the problems started. That right there already states the 5 Star has faulty software. If lucky the OP can clear codes and all is good but no promises.

This is interesting to me because I also moved from Las Vegas to Columbia Missouri so that is a significant drop in elevation. (sorry if I buried the lead on that one). I did not know they did anything special for elevation. that being said I have come to agree with the quality of the 5star Tune and even was wanting to get back to stock to begin looking into potential other tuners. My biggest issue with 5Star was really the clunky shifting that came with it.

 

[Kyle Hammerton]

Precisely. Not until he flashed it back to stock is when the codes were generated. That clearly indicates the issue is either a failed return to stock flash, DTC codes failing to be properly cleared by the flash module he used when returning to stock, or an actual physical issue with the truck, as cited in my original response. Not one of those could be blamed directly on 5 Star. Yes, he stated it felt like he had a loss of throttle response when running the tune and that is why he returned to stock. No other information about drive ability concerns when running the tune were given. Nothing to indicate the tune is to blame here AT ALL.

As to your repeated claims, I have searched for any reported issues or documentation citing that 5 Star doesn't use barometric pressure compensation. The only hits that came up were from an RV forum from 2012 and several posts from yourself and one or two others on here. That's it... When asked to post data on this showing proof of this claim no response was ever given. Not by you, or anyone else. So until someone can actually provide proof then your claims are worthless. Yes there were some reported issues with entering limp mode VERY early on in the tune development this has since been resolved and reported on by those who had the problem and reached out to 5 Star and received updates to the tuning files.

Failing to completely return to stock was my concern here. I reached out to 5Star for help. Biggest clue of this issue was the Start/Stop not coming back when I went back to stock. They resent my stock file and i reloaded it on the tuner. And the same thing happened. I have tried reloading the stock tune a couple times now. But I do think its an issue with getting the tune back to stock and something is not communicating right. I think that is leading to the U0422 Code. Its a communication issue. and I think the result of the P139C is something not getting properly changed back to a stock setting. I do believe its still possible the P139C could be real. I will check EGR this weekend to see. My Throttle issues feel like they started after we had some negative temps back in February. running a high performance tune in negative degrees for relatively short trips could gum up the works i imagine.

 

[Porpoise Hork]

What type of device are you using to flash the tune files with? If it's a BDX tuner have you tried updating it?

Does the tuner box have any pre-loaded tuning files on it and if so are you able to successfully flash it to one of those?

If none of that works another option is performing a factory reset on the tuner device and reloading the tuning files on it and see if it will successfully flash back to the original stock file or the one sent to you.

Other things to try is making sure that there are no damaged pins on the OBD2 cable for the tuner box, and making sure its internal battery is charged. Try connecting the OBD2 cable to the truck first then to the tuner box. My BDX unit is a little twitchy and will sometimes give an error if the cable is connected to the tuner unit when plugging it in to the truck. These units will charge with a micro USB cable, so plug it in to a cell phone charger for a couple hours then see if it behaves any better. I only mention this because when I received my Bullydog BDX unit it kept failing to read/flash the truck prior to getting a custom tune. When I reached out to Bullydog about it they the first thing they did was make sure it was on the latest firmware and had been charged for at least an hour. After running the updates and leaving it charge it would successfully connect to capture the stock file.

If it still fails after all that you may have a defective cable or maybe a loose wire on the OBD2 port on the truck causing the failure. You can get replacement cables on Ebay for about $40 unless you can find someone local who also has one that you can borrow. Lastly if you bought the tuner device new, it may still be under warranty and might be worth reaching out to them for support.

 

[Kyle Hammerton]

What type of device are you using to flash the tune files with? If it's a BDX tuner have you tried updating it?

Does the tuner box have any pre-loaded tuning files on it and if so are you able to successfully flash it to one of those?

If none of that works another option is performing a factory reset on the tuner device and reloading the tuning files on it and see if it will successfully flash back to the original stock file or the one sent to you.

Other things to try is making sure that there are no damaged pins on the OBD2 cable for the tuner box, and making sure its internal battery is charged. Try connecting the OBD2 cable to the truck first then to the tuner box. My BDX unit is a little twitchy and will sometimes give an error if the cable is connected to the tuner unit when plugging it in to the truck. These units will charge with a micro USB cable, so plug it in to a cell phone charger for a couple hours then see if it behaves any better. I only mention this because when I received my Bullydog BDX unit it kept failing to read/flash the truck prior to getting a custom tune. When I reached out to Bullydog about it they the first thing they did was make sure it was on the latest firmware and had been charged for at least an hour. After running the updates and leaving it charge it would successfully connect to capture the stock file.

If it still fails after all that you may have a defective cable or maybe a loose wire on the OBD2 port on the truck causing the failure. You can get replacement cables on Ebay for about $40 unless you can find someone local who also has one that you can borrow. Lastly if you bought the tuner device new, it may still be under warranty and might be worth reaching out to them for support.

Mine was the NGauge tuner. I am guessing it could be part of the issue since they seem to not be selling it anymore. This is great information. I will check this out and see if that's the case. I'm usually pugging it in from my driver seat so I don't actually see the OBD2 port and I am going by feel so I could have bumped a pin out of place. I also have kept the cable connected to the tuner and just plugged in the OBD2 end. the NGauge has two ports to accommodate different dash mounting positions so i can try another port on the tuner as well.

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