You need to check the low side fuel pressure using a mechanical gauge and compare it to the LOW side fuel pressure sensor data pid, if the pressure sensor is reading higher then actual then the computer will try and lower the pressure causing the engine to run lean and trims to go positive. take note that the pressure sensor will be about 14 psi off due to atmospheric pressure being calculated to the ECM and will not see on the mechanical gauge, but anything more then that would be a problem with the low side fuel pressure sensor stuck or fixed high tricking the computer to lower fuel pump speed to drop pressure. Good luck
OK so I had this problem same fault and what not vacuum tested found no leaks blah blah blah. I’m assuming the car is tuned the normal idle for the car is 650 if you have an intake on there pretty much any Mods for a tune ask them to raise the idle 100 RPM after the flash do a battery reset it should fix your fuel trims and your rough idle at least it did for me never got the code again car runs great
The fuel trims could be reset by the hptuners is you still have it and the code P0171 is the car running too lean, i have a picture of the code from a while back and it was the pcv hose for me
@@rays-777 I have the Cadillac ATS/ATS-V 2013-2017 Factory Service Repair Manual USB i can always send it to you. It’s very useful when it comes to doing stuff yourself
I went back and forth with ZZP on the tuning to see if it was the issue but it wasn't and since I already got rid of the CEL and the car was still running like shit I just sold it and that fixed my problem. I already spent thousands on upgrades and troubleshooting I can't do it anymore in this f'd up economy with inflation n all that BS
@@rays-777 damn..that crazy. That's true nothing but B.S. going on right now and for the next couple of years. Sucks. Well, I was going to get me a 2013 ats 2.0t myself but I'm starting to rethink it now. Hope you got yourself something better or just stack up your paper till we get through this mess.
@@SG-bb8pq Fo sho its like new BS everyday with no end in sight it seems like. I wouldn't recomend getting this 1st gen ATS unless u plan on rebuilding the engine with the FBO. I got the '17 Ford Explorer for the fam. ATS was fun while it lasted i learned a lot about boosted engines
@@sinusshephard5314 Why disconnect the battery? I seem to be running into the same problem as Vknight I'm plus 30 on LTFT no leaks, just left Cadillac they are saying replace the injectors but then said that isn't grantee going to fix it.
I kept going back and forth with my tuner and tried everything else to verify there was no leak. Only possibility I could think of was that the intake tube was too fat. I had the Mishimoto tube and the diameter on that was huge. I ended up selling the car.
@@Private011 Believe it or not I actually replaced them twice and I even replaced the High Pressure Fuel Pump and Fuel Sensor on the rail. Very few lucky ones have no issues with this car and a lot do whether stock or not. I like Caddilac but I would never buy an ATS again.
@@Almstedkenny cts motor mounts have 2 tube, on left side both this tubes was disconnected, when i plug them check engine light was turned off and that is all
Any issues with the intake tube.
Check you PCV pipes man. I’m gonna send you a link
You need to check the low side fuel pressure using a mechanical gauge and compare it to the LOW side fuel pressure sensor data pid, if the pressure sensor is reading higher then actual then the computer will try and lower the pressure causing the engine to run lean and trims to go positive. take note that the pressure sensor will be about 14 psi off due to atmospheric pressure being calculated to the ECM and will not see on the mechanical gauge, but anything more then that would be a problem with the low side fuel pressure sensor stuck or fixed high tricking the computer to lower fuel pump speed to drop pressure. Good luck
Yup was gonna do that I rented a gauge from Pep Boys but ultimately I ended up selling the car thankx tho
Hello did you find a solution. I got code after installing zzp cold air intake a few days ago.
That means u have to get a tune
Ever figure this out?
@JordanSaraiva before I sold the car my tuner told me the diameter of the intake looked too big but I guess I'll never know
OK so I had this problem same fault and what not vacuum tested found no leaks blah blah blah. I’m assuming the car is tuned the normal idle for the car is 650 if you have an intake on there pretty much any Mods for a tune ask them to raise the idle 100 RPM after the flash do a battery reset it should fix your fuel trims and your rough idle at least it did for me never got the code again car runs great
Interesting thankx!
The
The fuel trims could be reset by the hptuners is you still have it and the code P0171 is the car running too lean, i have a picture of the code from a while back and it was the pcv hose for me
@@rays-777 let me know if you want a picture of the p0171 lean code and how to reset the FUEL TRIMs with the hptuner
@@rays-777 I have the Cadillac ATS/ATS-V 2013-2017 Factory Service Repair Manual USB i can always send it to you. It’s very useful when it comes to doing stuff yourself
Did you ever figure out what the problem was?
I went back and forth with ZZP on the tuning to see if it was the issue but it wasn't and since I already got rid of the CEL and the car was still running like shit I just sold it and that fixed my problem. I already spent thousands on upgrades and troubleshooting I can't do it anymore in this f'd up economy with inflation n all that BS
@@rays-777 damn..that crazy. That's true nothing but B.S. going on right now and for the next couple of years. Sucks. Well, I was going to get me a 2013 ats 2.0t myself but I'm starting to rethink it now. Hope you got yourself something better or just stack up your paper till we get through this mess.
@@SG-bb8pq Fo sho its like new BS everyday with no end in sight it seems like. I wouldn't recomend getting this 1st gen ATS unless u plan on rebuilding the engine with the FBO. I got the '17 Ford Explorer for the fam. ATS was fun while it lasted i learned a lot about boosted engines
Undo positive battery lead and let it sit over night.
@@sinusshephard5314 Why disconnect the battery? I seem to be running into the same problem as Vknight I'm plus 30 on LTFT no leaks, just left Cadillac they are saying replace the injectors but then said that isn't grantee going to fix it.
i have 2015 cts 2.0, same problem, please tell me if you fix this error code from hell
I kept going back and forth with my tuner and tried everything else to verify there was no leak. Only possibility I could think of was that the intake tube was too fat. I had the Mishimoto tube and the diameter on that was huge. I ended up selling the car.
@@Private011 Believe it or not I actually replaced them twice and I even replaced the High Pressure Fuel Pump and Fuel Sensor on the rail. Very few lucky ones have no issues with this car and a lot do whether stock or not. I like Caddilac but I would never buy an ATS again.
You ever figure this out? I have the same problem lol
@@Almstedkenny cts motor mounts have 2 tube, on left side both this tubes was disconnected, when i plug them check engine light was turned off and that is all
@@Almstedkenny you can find and check them under the car