Originally Posted by AA 954
P2015 and P2020 is a code that comes up for each of the banks (1 & 2) when the values measured by each potentiometer are out of range, this will automatically come accompanied by an EPC code which in turn will limit your revs to ~7k
Potential Reasons for this:
- Needs a Carbon Clean, flap arms get stuck and do not open or close enough, basically at idle flaps in the IM will stay close until around 4k where they will open, at close or open they need to read within a range or the ecu will throw a code.
- Vacuum bypass/sensor at the front of the IM needs changing, there should be a write up somewhere or reach out to either Jonan or Pyromatic as they have changed this without removing their IM’s, PITA scale 5-6
and you need small hands
- Bad potentiometer, one you can change without removing the Intake Manifold, if its the other you will need to remove it as I recall.
- Bad actuator vacuum arms, these are at the front and underneath the manifold, hopefully its not the one that controls the right bank as they are expensive to change
- Bad linkage arm, have someone accelerate your car to above 4k and see if these move evenly, these plastic arms wear over time and break although if it was broken, I would expect you to get a code immediately after hitting 4k revs the first time.
- Vacuum leak on the hose that connects to the vacuum actuator arm bank 2
- Think I read somewhere that a bad PCV can influence on this too, no idea...
My personal experience when I had these codes is that it got fixed after performing a Carbon Clean, installing new potentiometers and changed that front IM valve bypass/sensor.
Potential Reasons for this:
- Needs a Carbon Clean, flap arms get stuck and do not open or close enough, basically at idle flaps in the IM will stay close until around 4k where they will open, at close or open they need to read within a range or the ecu will throw a code.
- Vacuum bypass/sensor at the front of the IM needs changing, there should be a write up somewhere or reach out to either Jonan or Pyromatic as they have changed this without removing their IM’s, PITA scale 5-6
and you need small hands- Bad potentiometer, one you can change without removing the Intake Manifold, if its the other you will need to remove it as I recall.
- Bad actuator vacuum arms, these are at the front and underneath the manifold, hopefully its not the one that controls the right bank as they are expensive to change
- Bad linkage arm, have someone accelerate your car to above 4k and see if these move evenly, these plastic arms wear over time and break although if it was broken, I would expect you to get a code immediately after hitting 4k revs the first time.
- Vacuum leak on the hose that connects to the vacuum actuator arm bank 2
- Think I read somewhere that a bad PCV can influence on this too, no idea...
My personal experience when I had these codes is that it got fixed after performing a Carbon Clean, installing new potentiometers and changed that front IM valve bypass/sensor.
The car had a carbon cleaning about 10,000 miles ago, so hopefully that's not already needed again.
I'll have to look into all this more this weekend and hopefully am able to narrow it down a little more. I'll try to keep you posted!
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