I had previously posted here:
Sadness - 2002 V70 2.4T - Transmission Service Required - is it time to say goodbye?
I was driving along the interstate going ~65 MPH, roughly 2,300 RPM, and all of a sudden the “Transmission Service Required” message pops up on the DIM.
Drove home in limp mode, let sit overnight, and the car ran perfectly fine the next day, not in limp mode. At least at first. Multiple trips, anything of any significance, it goes into limp mode.
Long story short after a drain and fill and and evaluation by my indy shop, and an ECM repair by XeMODeX, the issue still persists. (I had a 711A “Internal Fault” for years, so decided to take a chance on that maybe being a contributing factor. Alas, it does not appear so…but at least the 711A is gone
)The Indy shop mentioned that the transmission received the engine speed as 6,000 RPM at the same time that I got the transmission message on the DIM. They were able to reproduce this.
Connecting my cheap OBD sensor and using the Torque app on my Android tablet, I saw that there were two different RPM gauges, so I added them both.
At first, they both match the tach in the DIM almost perfectly. However, after a bit of driving, one of the gauges pops to 6,000 RPM and stays there, while the other still matches the tach in the DIM up and down, perfectly.
So now the puzzlement - what would cause this difference? There’s got to be some sensor or module that is acting up that is causing the TCM to be confused and going into limp mode.
Where do I go from here?
Jonboy
2002 V70 2.4T - 302,600 miles
