bigjake
Veteran Member
Hey guys,
Back in May, I swapped my KP39 for a VNT-17. I had no issues whatsoever up until the past two weeks. I started catching limp mode occasionally. But here recently it's becoming very frequent. I did some research as to why this would happen with a brand new turbo and a lot of folks pointed their fingers at the N75 or an improperly tuned turbo. I happened to have a new pierburg N75 laying around so I dropped that in with no luck. I went to use my vacuum pump to check pressure but discovered my pump is broken.
Although I'm waiting on my new one to arrive, I'm apprehensive to believe the turbo is improperly tuned. This came from KermaTDI. It was advertised as a "plug and play" turbo that had no issues for months.
I then hooked up my code reader. I have two codes. One is an overboost code and another is a P2564 code, which seems like it's some kind of wiring issue with the actuator. Per some threads on here, it seems like the most common cause of that issue is a short caused by the wiring insulation rubbing away. My dad and I pulled back the loom and checked everything. all the wiring, pins and connections appear normal. We attempted to test the voltage at the harness and got 5 volts from the yellow wire, but got nothing from the other two.
I have several questions here.
Is/can this code be the cause of an overboost? Many of the threads I've seen on here, people seem to cite it as more of an annoyance causing a CEL more than anything.
Since I have a code mentioning the actuator and an accompanying overboost code, I'm getting some memories of my failing KP39 actuator which was causing overboosting. Do VNT-17 actuators fail and go the same route as kp-39s? If so, has anyone heard of one failing so soon?
Does anyone know the voltages I'm supposed to be seeing coming from the actuator wiring harness? I'm bothered by the fact only one of those wires showed voltage.
Is it possible that the turbo was tuned at the beginning but something failed or creeped causing the tune to get out of whack?
I'll follow up with vacuum numbers once my pump/gauge arrives. Until then, got any ideas?
Back in May, I swapped my KP39 for a VNT-17. I had no issues whatsoever up until the past two weeks. I started catching limp mode occasionally. But here recently it's becoming very frequent. I did some research as to why this would happen with a brand new turbo and a lot of folks pointed their fingers at the N75 or an improperly tuned turbo. I happened to have a new pierburg N75 laying around so I dropped that in with no luck. I went to use my vacuum pump to check pressure but discovered my pump is broken.
Although I'm waiting on my new one to arrive, I'm apprehensive to believe the turbo is improperly tuned. This came from KermaTDI. It was advertised as a "plug and play" turbo that had no issues for months.I then hooked up my code reader. I have two codes. One is an overboost code and another is a P2564 code, which seems like it's some kind of wiring issue with the actuator. Per some threads on here, it seems like the most common cause of that issue is a short caused by the wiring insulation rubbing away. My dad and I pulled back the loom and checked everything. all the wiring, pins and connections appear normal. We attempted to test the voltage at the harness and got 5 volts from the yellow wire, but got nothing from the other two.
I have several questions here.
Is/can this code be the cause of an overboost? Many of the threads I've seen on here, people seem to cite it as more of an annoyance causing a CEL more than anything.
Since I have a code mentioning the actuator and an accompanying overboost code, I'm getting some memories of my failing KP39 actuator which was causing overboosting. Do VNT-17 actuators fail and go the same route as kp-39s? If so, has anyone heard of one failing so soon?
Does anyone know the voltages I'm supposed to be seeing coming from the actuator wiring harness? I'm bothered by the fact only one of those wires showed voltage.
Is it possible that the turbo was tuned at the beginning but something failed or creeped causing the tune to get out of whack?
I'll follow up with vacuum numbers once my pump/gauge arrives. Until then, got any ideas?
