TDI Mason
Veteran Member
Hello all,
I'm relatively new here and have been living on this site for the past month or so trying to diagnose a limp mode problem. My car (03 tdi wagon 145000mi) has a limp mode issue with a pattern I haven't read about on here before. It seems to go into limp mode predictably very shortly after first start up of the day on a cold engine but if I pull over and shut the car off for a few minutes for it to reset I am fine for the rest of the drive and can't get it to go into limp mode no matter what I try until the car is shut off long enough for the engine to cool all the way down.
I have tried the following:
-replaced N75
-replaced MAF
-checked for vacuum leaks
-cleaned snow screen
-new air filter
-adjusted vnt control arm as per VW tsb i found on this site
-turbo was replaced within the past few thousand miles by the previous owner (so i am doubting sticky/carboned up vanes).
Enter Vagcom: So I decided I needed to view more data and purchased myself a vagcom cable to see what was happening and since I've had it (bout a week now) I've been driving around graphing requested vs. actual boost in VC scope and I've seen a few random spikes off the charts on the vc scope graph but the car won't go into limp mode. So yesterday I was tired of driving around with a laptop in the passenger seat so I unhooked Vag and what do you know... limp mode. This morning cold engine Vag hooked up, no limp mode.
So my question is (aside from if anyone can help me with my limp mode issue) will the ecu not send the car into limp mode when diagnostic equipment is plugged in?
I'm relatively new here and have been living on this site for the past month or so trying to diagnose a limp mode problem. My car (03 tdi wagon 145000mi) has a limp mode issue with a pattern I haven't read about on here before. It seems to go into limp mode predictably very shortly after first start up of the day on a cold engine but if I pull over and shut the car off for a few minutes for it to reset I am fine for the rest of the drive and can't get it to go into limp mode no matter what I try until the car is shut off long enough for the engine to cool all the way down.
I have tried the following:
-replaced N75
-replaced MAF
-checked for vacuum leaks
-cleaned snow screen
-new air filter
-adjusted vnt control arm as per VW tsb i found on this site
-turbo was replaced within the past few thousand miles by the previous owner (so i am doubting sticky/carboned up vanes).
Enter Vagcom: So I decided I needed to view more data and purchased myself a vagcom cable to see what was happening and since I've had it (bout a week now) I've been driving around graphing requested vs. actual boost in VC scope and I've seen a few random spikes off the charts on the vc scope graph but the car won't go into limp mode. So yesterday I was tired of driving around with a laptop in the passenger seat so I unhooked Vag and what do you know... limp mode. This morning cold engine Vag hooked up, no limp mode.
So my question is (aside from if anyone can help me with my limp mode issue) will the ecu not send the car into limp mode when diagnostic equipment is plugged in?