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Old 06-24-2017, 05:50 PM   #1
PanteraSti
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Member#: 451970
Join Date: Aug 2016
Location: Puerto Rico
Vehicle:
2015 Sti
Black

Default Car stuck on code P2109, Throttle and pedal have no communication.

So here's an update of my situation.
I really really really need someone's help.
I have a 2015 Sti:
I bought it on june 2016 imported from the US like this:
FluidAmpr crank pulley
5 inches Tmic
Cobb downpipe
Cobb intake
Invidia q300
Turbosmart blow off.
It showed like it had an Accesport cause it had the AP mount but no AP on it.
I Haven't done any engine mods whatsoever.
Only exterior cosmetic mods.
So here's forward to now....
On June 6 it went on limp mode, but not the actual limp mode, it just lost all communication in the "throttle with pedal" department, then came two times back randomly and then it stayed with no communication at all.
So the car turns on, but doesn't open the throttle, does not pass 5 mph and doesn't pass the 1,600 rev mark. On the center console shows the percentage of acceleration when you press the pedal but no action on the throttle.
Also, when it started to fail it showed two codes, first it was "P2101", then shut off that code and showed "P2109"and it has been showing that only code ever since it first started with the problem.
It also turned the check engine light, traction control light, abs light, "S" mode blinking on dash panel.
Since June 6 they've checked all plugs and harness, all of them showed signal of communicating with each other.
Exchange throttle with another and it did the same, same with the pedal.
BUT! only the two wires that tell the throttle to open and close weren't communicating, ones that go to the ECU.
But they measured the signals from wires to Ecu and wires are ok.
So next was to use a Cobb Accesport I bought 3 months ago that I never got to use for downloading data to the car, only to use it as a read out display to keep on check the temperature, knock, etc etc.
To reflash the ecu thinking the possibility that the old data that was before may be corrupted.
But guess what?
Accesport couldn't communicate and download any data whatsoever, just read.
So I thought "I got punked and they sold me a married AP."
But then we tried an unmarried AP and it happened the same thing.
So now the last and final effort is to change the cars Ecu with another same model and year STI. Will it work? We don't know.
It's been 18 days of extensive and exhausting work trying to find the problem and I guess we're close, but apart from all of this "hitting dead ends" I don't know what else to think off.
I really need your help.
I would appreciate all internet trolls to stay out of this one.
As a favor.
For real.
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Old 06-24-2017, 06:32 PM   #2
Blktrax
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Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: West, NC
Vehicle:
2002 WRX 224K Mi.

Default

.....

Last edited by Blktrax; 06-25-2017 at 09:26 AM.
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Old 06-24-2017, 11:24 PM   #3
Scuby04STi
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Member#: 328635
Join Date: Aug 2012
Chapter/Region: NWIC
Location: Portland*
Vehicle:
2004 STi GTX3076R
Rally Blue

Default

Did you ever physically look and see if thr butterfly moves or try to swap the throttle body? My car had the same issue and once I plugged in a spare TB everything was fine.
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Old 06-24-2017, 11:49 PM   #4
PanteraSti
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Member#: 451970
Join Date: Aug 2016
Location: Puerto Rico
Vehicle:
2015 Sti
Black

Default

Quote:
Originally Posted by Blktrax View Post
You can try a NEW ECM and have it programmed to the Car.



You CANNOT swap an ECM from another running vehicle.



The ECM has to be regisited with the VIN, along with "C.A.N bus" handshakes to the BIU (Body Integrated Unit) and Gauge Cluster. That way Immoblizer will allow the car to start.



If you simply swap ECM's you run the risk of Bricking another ECM, as it will think it is a Theft attempt.



If the Wires check good, and the pedal didn't fix it, you likely have a bad ECM.


We changed the ecm and it started fine, but it was throwing the same code.
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Old 06-24-2017, 11:51 PM   #5
PanteraSti
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Member#: 451970
Join Date: Aug 2016
Location: Puerto Rico
Vehicle:
2015 Sti
Black

Default

Quote:
Originally Posted by Scuby04STi View Post
Did you ever physically look and see if thr butterfly moves or try to swap the throttle body? My car had the same issue and once I plugged in a spare TB everything was fine.


We did check the throttle body and changed for other. But nothing. The same.
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Old 10-14-2019, 08:58 PM   #6
bigjohnsieper
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Member#: 492638
Join Date: Oct 2018
Location: Albany NY
Vehicle:
2012 WRX Hatch
White

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I know this is old but did you ever figure it out? My 2019 is doing the same thing..
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Old 10-15-2019, 06:48 AM   #7
hoang5659
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Member#: 416298
Join Date: Mar 2015
Location: Houston, TX
Vehicle:
2015 STI Limited
Galaxy/Lapis Blue

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if you have a 2019 i would take it into the dealer to diagnose... if anything is wrong, they can fix it under warranty.
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Old 10-15-2019, 11:00 AM   #8
bigjohnsieper
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Location: Albany NY
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White

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Yeah it's at the dealer, I actually work here. The techs have done everything the original poster did, still no luck.
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