Hyundai wastegate

2013 Hyundai Santa fe 2.0t
Car came into me with a low power complaint, found the turbo was in failsafe ( wastegate open ) pending code p2563 which is a wastegate actuator performance code. Cycle the key and power is retained, when road testing the car and driving it hard under high boost the car goes back into limp mode. I believe I have it narrowed down to the pcm but not 100% I'm seeing some weird and inconsistent pulsewidth from the pcm to command the wastegate actuator which leads me to believe it's the pcm. Any feedback is greatly appreciated or if anyone has ran into this before or has a known good waveform available. I want to be 100% and don't have access to a known good waveform.

Wastegate actuator was changed and is properly adjusted

Yellow trace is the signal from the ewga to the pcm
Green trace is pulsewidth for the motor from the pcm

1.2v is wastegate open and 4.2v is wastegate closed, the pcm is seeing the wastegate signal pass 4.2 and hit 4.9v multiple times within 5 seconds and flags the code therfor putting the turbo into failsafe. Does the green trace look normal? I've attached a wiring diagram as well

Is a vgt turbo diesel?! Did you check if turbo actuator is partially stack.
Sensors and components can make the engine get in limp mode!

2.0turbo GDI engine and the turbo actuator is new and moves freely, it’s electronically controlled

Ca you you move it by hand and see if there’s. a bad spot in the potentiometer? Any flash updates for the code??

I moved it by hand and there’s no bad spots on the potentiometer, the yellow trace is the signal from the potentiometer which would suggest a bad egwa but it was changed already, I know new parts aren’t always good though. The fault only happens in the high rpm range close to redline but only happens intermittently. I don’t have access to Hyundai factory flash info, there’s no tsb or reflash info on pro demand or identifix for the code.

Did you calibrate/program it?

Make sure your not losing the reference voltage or ground to the sensor when it has them spikes like that. Just a thought

No calibration or reprogramming required, I will test today if I’m intermittently loosing ground or 5v ref during the spikes, makes sense, will report back

Drove the car again it only starts to glitch out under high heat after about 20mins of driving. Monitored the 5v reference and stays constant during the glitch, monitored the ground wire and it stays the same during the glitch. When monitoring the ground wire I would occasionally get drop offs ( green trace ) wouldn’t always happen when the yellow glitches though not sure if it’s related or not.

In the last trace you posted, sensor ground on ch2 max voltage was near 900mv at some point.
Is that accurate, were you maybe moving the leads around or something?

I had the scope recording before the car was started, I believe that spike was during cranking

Any success narrowing down the issue. I have the same issue and have replaced EWGA and adjusted properly with no success.

Yes did end up resulting the issue. The issue would only happen under extreme driving habits, ie - if the turbo was glowing hot. if the vehicle was driven normally the fault would never occur. Ended up being a worn out turbo expanding causing the excessive play due to the heat. Replaced the turbo and readjusted the arm and it never set again.