Originally Posted by VII7

I'm not there and someone already posted about a defective ECU but it sounds to me like you are plugged into the wrong terminal or wired ground and ground.
If you hear a clicking this is likely a relay switching so identify which relay this is, check output for power and make sure you are plugged in there.

Also remember the switching is done towards ground so 12 should be supplied continuously from fuse box.
Do you have 12V supplied if you measure against a ground point?
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Originally Posted by JamesP13RRN

I have this exact problem - identical.

Did you sort the issue? Im lost as to why i have 0.6v too, all apparatus is new. Aside from sorting this ill be wiring a new feed and installing a separate button as im certainly not buying a new ECU just for this when everything else works.

Originally Posted by dannyk304

Hi - I just installed the PSE kit on my 2016 C2 with a brand new kit I got from Suncoast, came with everything including new switch console. I did the entire install myself, the vacuum lines and wiring into the cabin, grounded where indicted and wired all the way into the computer under the driver's seat plugged into the A2 slot as directed, went to the dealer and paid almost 400$ (sort of ridiculous but whatever) to have the new switch console programmed. However, the button doesn't activate the flap actuators on the center muffler. The light on the PSE button lights up, seems to work fine, turns on automatically when in sport, I can turn it on or off at a press of the button. However, it doesn't translate to the actuators. The service tech said he could look at it some other day but at a pretty heavy cost but advised me to check if the COV is getting power. I bought a multimeter and tested the harness that attaches to the COV - reads .61 Volts, whether button is on (lit up) or off. so I guess it's getting power, means I did the wiring sufficiently OK? I am stuck, not sure what else it can be? The COV is brand new as part of the retrofit kit. Anyone with insight? Any help is greatly appreciated - @plenum if you see this, I know you have some excellent knowledge and information out there on COVs, any chance you know the voltage/amperage I should be reading at the harness for the COV? does .61 Volts make sense? shouldn't it be different depending on when it's on or off? anyone who can add some insight, I would be grateful.

Originally Posted by dannyk304

I have not sorted it, no. Since it's permanently in the open (loud) I'm not rushing. I do want it to work but I will not be buying any new ECU for this issue. I spoke with the tech who programmed the new switch console and he said check every fuse. I just don't care anymore, but if you find a solution please update me.

Originally Posted by Nash911

Were you able to resolve your issue? My car was fixed after a replacement of the rear-engine control unit which apparently had a fault that wasn’t popping up anywhere.

Originally Posted by JamesP13RRN

It’s the rear body control module I suspected on mine so I just got fed up with the whole thing and fitted my own switch.

Originally Posted by JamesP13RRN

Here we go

Originally Posted by Pinkawa

i am sorry but 0.61 volts is next to nothing . It should read 12 volts when it is activated (position : exhaust valve closed )

Originally Posted by jrussell350

I'm glad I found this thread because I'm having the same problem on my '13 C2S where it's always in "loud" mode. The aftermarket exhaust is a bit obnoxious on start up and as a daily driver it would be nice to have it quieter. The previous owner installed the PSE and I always noticed that the PSE button doesn't seem to change the sound. The light does turn on when pressed and also lights with sport mode. I took it to the dealer thinking that he possibly never had it programmed but they said it was programmed. I pulled the bumper and other misc parts in the way thinking that something might have been disconnected, but all of the vacuum lines look to be attached. One key difference compared to OP is that my COV doesn't audibly click when PSE is pressed. I also tested the wire going to the COV and it shows 0.017V DC whether the PSE is lit or not. I'm afraid this points to the ECU as was the case with one of the commenters.