EPC Light - no boost - no fault stored

Oldschoolmk7 said:

Interesting...? Can they not just replace the WG or is it somehow part of turbo unit? Have to look again. I was going to say put the stock intake box back on. I have run a piggyback for well over 10k miles and never got a EPC fault code.

Click to expand...

tlassy said:

Yeah not sure, I didn't really ask much more about it, it was just a quick phone call. I'll ask more about it when I pick the car up in a few days. I've been running the jb1/jb4 for about 13k and hadn't had any problems until this.

Click to expand...

Oldschoolmk7 said:

How long on the CTS intake 13k? Reason I asked there was previous owner with jb1 and same/similiar intake getting EPC codes and he traded car at 30k miles for wrx. He could never sort it out...

Is dealer ok with aftermarket intake and warranty??

Click to expand...

hardR said:

Hey everyone, long time reader, but this is my first time actually posting on here. I had the same issue tonight. I am running a JB4 with a APR intake and DP. I just switched back to map 0 from map 1 due to a cross country trip (FL to CA) and the fact that my clutch is starting to slip. I wanted to see if my clutch would still be able to hold stock power. I was in 4th gear and hit the gas hard my EPC light came on and I lost all power. The boost gauge in the head unit read 0 along with my laptop since I had it plugged in to change back to map 0. I turned the car off and tried to see if there was a code and had nothing other than the exhaust code(P0420) which has been there since I installed my DP. I turned the car back on and everything seems normal. Also the EPC light went off after I started back up. Just wanted to see if there is a way to be able to check if the waste gate is actually stuck open. Visually looking into the engine bay all of the hoses look normal.

Click to expand...

Gawernator said:

If you have VAG COM you can run the wastegate test.

Click to expand...

Gawernator said:

If you have VAG COM you can run the wastegate test.

Click to expand...

hardR said:

How much does it cost to get a VAG COM or VCDS reader. They are both the same thing, correct?

Click to expand...

hardR said:

I will look into that tomorrow. Just need to find one near me. How much does it cost to get a VAG COM or VCDS reader. They are both the same thing, correct?

Click to expand...

delsvr said:

Working on this problem as well. Does anyone know how the test actually works? And I believe there are at least two settings here: a test for the actuator as well as an adaptation ("first adaptation of charge pressure actuator"); how is this calibration done? Seems entirely automatic?



It's about $200 for the most basic reader (limited to 3 vins) and yes, that includes software.

Click to expand...

tlassy said:

Hi All,

Long time reader and finally had an issue I need opinions on. I read a bunch of other EPC threads and they didn't really seem to apply.

I have been having the EPC light come on anytime I drive, it cuts all boost, as noticed by my P3. it happens at any throttle/load input and in any gear at around 3000 rpm (ex. 1st gear pulling out of my driveway). It won't build any boost. It drives normal otherwise, I don't have speed restrictions nor does it seem to limit RPMs, it just cuts all boost.

I do have a CTS intake and a JB4 on map 2, both have been installed for over a year with no problems, I did pull the JB4 off and the EPC light still comes on.

The strange part is that when I go to pull the code it doesn't show any, thinking it was the torque pro app not working properly, I pulled the MAP sensor plug and the MAP sensor code popped up. If I clear codes, the light goes away, but will then come back on immediately boost tries build.

Click to expand...