P334A00 - Charge Pressure Actuator - Electrical Error

[jibby40]

Currently 1 month into trying to figure out whats causing this error. Im Unitronic Stage 2 on my 2020 S3. Happened on the stock turbo at around 9-10k miles. Car goes into limp mode and throws the turbocharger/supercharger boost control A module - performance and turbocharger/supercharger boost control A - circuit open code. Replaced the stock IHI turbo with an HPA OEM+ turbo and 1 year and 3 months later here i am again. Same codes. This time i reached out to HPA who sent me a new actuator (i had to pay). I had a shop replace the actuator but didnt know they had to set the voltage or perform the adaptation. Took it upon myself to complete that part for funds sake. HPA told me they send turbos out the door at 3.6v. Set the voltage as close to 3.6 as possible (3.63v). Used OBDEleven to run the “first adaptation of charge pressure actuator” which ran fine. (Goes to activated then right to basic settings ended). Have yet to get the car to pass the “low end stop test” in obd11 and car still goes right into limp mode with code P334A00 charge pressure actuator - electrical error. I tried moving the actuator/wastegate arm by hand without taking anything apart and it doesnt seem to budge. Played around with some othet turbos my friend has laying around and was able to easily move them. Not sure if i just dont have the leverage to move the arm with the actuator on the car or not. Car has a brand new battery, brand new actuator, the alternator was checked and determined to be fine. I flashed the car back to stock before replacing the actuator and no change. At this point not sure if i should just bite the bullet and take a guess that the turbo is bad and replace the turbo with an actuator already bolted on or if i should bring it to a shop that can do some real troubleshooting? Anyone out there have any ideas? Any help is appreciated.

[jibby40]

It is on a 2020 S3. Yep, I have done all of the reading on all of those posts. Thats the video i used to do the adaptation today. I tried 3.54, 3.7 and 3.63. HPA recommends 3.6. I actually spoke with one of the head technicians at HPA and picked his brain and he basically told me to put my old turbo back in (the one with the broken actuator, or so i think) and see if it works.... Aside from that he said to pull the actuator off and check it, check that the wastegate arm moves freely, and to check to make sure the pins were not damaged. He also mentioned that the adaptation shouldn't be that sensitive where 3.63 instead of 3.6 will cause it to fail or have issues. I tried pulling on the actuator in the car with it all bolted up and i couldn't get it to budge. I have the actuator i took off the turbo when I replaced it last week and that one doesnt seem to move at all either when i push or pull. Maybe just 1mm in and out or so, but it barely moves. Do the 2020 S3 Actuators not move anymore? For context, my actuator is the same one as the shopdap video you sent. Most people say it's either a bad actuator or the voltage needs to be adjusted with that code. I have literally seen 0 posts about it ever being a legitimate wiring issue. I have already replaced the actuator with a brand new one and set the voltage to 3 different settings with an adaptation after each. I'm using an ODBEleven, does anyone know if the I should be looking at the Charge Pressure Actuator, Acknowledgement or if i should be looking at the Charge Air Pressure Actuator, unconditioned voltage to set the voltage like shopdap says? My unconditioned voltage was showing around 1.7 so i didnt go based on that one since the others were already nearing 3.6. Maybe that's my issue? It just seems like that didn't make sense since the low end stop and the acknowledgement were set right. Even the tech at HPA told me that i should look at the acknowledgement numbers.

[jibby40]

I dont really see how, but care to simplify for me? What are you suggesting? All im trying to do is get the car fixed.

[jibby40]

There's absolutely nothing "all over the place" about my posts. I am simply asking questions where I have questions and looking for people that have had the same issue and have actual valuable information. OBDEleven should work just as well as VCDS. ShopDAP used ODBEleven and HPA even told me themselves that it should work. I don't suspect wiring, as I suggested in my post that i have never seen anyone say it has been a wiring issue on the forums. It has always been the wastegate or the actuator... I adjusted the actuator arm the only way possible, loosen the nut, spin the rod until it reads the proper voltage. My confusion is which value to be looking at, you wouldn't know the answer to this if you don't use ODB11. How could you screw up tightening the nut? I am staring at the voltage on my phone as I am adjusting it and tightening the nut. Im not brain dead dude... HPA has been around for 30+ years. If you know anything about the aftermarket german car scene you would have heard of them.. Not made in China. If you have nothing valueable to add to the conversation then please stop responding. Thanks