bootlogic100
New member
My son has a 2005 Passat 2.0 TDI. Ran great until 2 weeks ago. He lost power going up hills which it seems is going into limp mode. I pulled the codes with my ObdLink.
Engine codes:
P0671 - Cylinder 1 Glow Plug Circuit
P0672 - Cylinder 2 Glow Plug Circuit
P0673 - Cylinder 3 Glow Plug Circuit
P0674 - Cylinder 4 Glow Plug Circuit
P0299 - Boost Pressure Regulation Control Range Not Reached
P2108 Throttle Actuator Control Module Performance
My son says the codes that were on there when he bought it were P0673 and P2108. I don't know when the other codes were set and if they have anything to do with the Limp mode.
I cleared the codes.
He had overfilled the engine oil a bit (not sure how much but probably right past the bend in the dipstic right before it went into limp mode. I looked up and it looked like that was not a good thing so we suctioned out some. He then proceeded to drive it probably another 120 miles before it went into limp mode again.
Not knowing much about diesel engines and turbo boosters I started reading and watching videos.
All the same codes are still there.
I bought a hand pump (mityvac) and we hooked into tube going into turbo solenoid and tested the vacuum pump. That seemed good although if we wiggled the hose at the T or where it went into the vacuum pump it would drop it a bit. Didn't seem like great connections but was still pulling 20-25 hg consistently.
We then hooked up to the tube coming from the turbo actuator (disconnected from turbo solenoid) and successfully drove the rod up and down and it held.
I still haven't tested the actual turbo solenoid as I'm not sure how to do that without buying VCDS.
I think are next task is a Boost Leak Test. Unfortunately the top 2 videos of Boost leak symptoms video and DIY boost leak tester (myturbodiesel.com) show unavailable but I think this Intercooler air intake pressure test boost leak maf P0101 2005 Volkswagen Passat TDI B5.5 BHW - YouTube shows it as well.
It seems like it could be an intermittent issue, and just trying to best determine the path we should go or if the combination of codes above point to anything.
Let me know if you have any suggestions.
Engine codes:
P0671 - Cylinder 1 Glow Plug Circuit
P0672 - Cylinder 2 Glow Plug Circuit
P0673 - Cylinder 3 Glow Plug Circuit
P0674 - Cylinder 4 Glow Plug Circuit
P0299 - Boost Pressure Regulation Control Range Not Reached
P2108 Throttle Actuator Control Module Performance
My son says the codes that were on there when he bought it were P0673 and P2108. I don't know when the other codes were set and if they have anything to do with the Limp mode.
I cleared the codes.
He had overfilled the engine oil a bit (not sure how much but probably right past the bend in the dipstic right before it went into limp mode. I looked up and it looked like that was not a good thing so we suctioned out some. He then proceeded to drive it probably another 120 miles before it went into limp mode again.
Not knowing much about diesel engines and turbo boosters I started reading and watching videos.
All the same codes are still there.
I bought a hand pump (mityvac) and we hooked into tube going into turbo solenoid and tested the vacuum pump. That seemed good although if we wiggled the hose at the T or where it went into the vacuum pump it would drop it a bit. Didn't seem like great connections but was still pulling 20-25 hg consistently.
We then hooked up to the tube coming from the turbo actuator (disconnected from turbo solenoid) and successfully drove the rod up and down and it held.
I still haven't tested the actual turbo solenoid as I'm not sure how to do that without buying VCDS.
I think are next task is a Boost Leak Test. Unfortunately the top 2 videos of Boost leak symptoms video and DIY boost leak tester (myturbodiesel.com) show unavailable but I think this Intercooler air intake pressure test boost leak maf P0101 2005 Volkswagen Passat TDI B5.5 BHW - YouTube shows it as well.
It seems like it could be an intermittent issue, and just trying to best determine the path we should go or if the combination of codes above point to anything.
Let me know if you have any suggestions.