Hi All,
I've had a look on the forum and seen some good topics regarding this warning, but I'm hoping to post a fresh topic to share my experiences and hopefully gain some insight to my problem.
Warning: Long post.
Short version: Car goes into Tiptronic Emergenc Run Warning when accelerating hard. Had the car 'fixed' by a Specialist but seems to have returned. Background
Stock Porsche 996t 2004, car has 70k miles, and has given me zero problems in my 12 months ownership.
Initial Symptoms
I put my foot down in 2nd and the car suddenly felt weird - it felt like the clutch slipped and the revs were all over the place.. I took my foot off the gas pedal and let the car slow down. I noticed that the "Tiptronic Emergency Run" warning was showing on my center console and the lights indicating "D" and "4"th gear were flashing.
I turned the car off, waited 30 seconds and turned it back on. No warnings, car drove normally and I started heading back home. I put my foot down once again and the symptoms occurred again - pulling away in 2nd and everything goes weird, before it heads into limp mode and I have to restart the car.
I carefully get the car home and notice there's quite a few oil drops on the road (it had started to rain, and this made the spots really easy to see). I parked the car up and got it picked up by a Porsche specialist that was nearby.
'The Fix'
The specialist found that an oil pipe had corroded which was causing a leak. He suggested that the Warning was likely because there was low ATF levels - which seems to be a common cause according to searches on here.
Anyway, 10 labour hours later and the pipe has been replaced, ATF filled up and leak fixed.
The Issue.. again.
I got the car fully serviced and took it away... 100 miles later and I'm pulling away from the lights where the symptoms kick in again. Restart, and it's fine - although driving it carefully I've noticed a few things: the car seems to struggle a bit when pulling away up hills, and a bit hesitant when changing gears. I've parked the car up as it's been raining heavily here and don't have somewhere to check anything out.
Finally!
Reading on this forum suggests it could be a TCU fault, which makes sense as it seems to fix itself when restarting the car. The valve body also seems to be a common theme, but I don't know what I can do to test that? Any other things I should be checking?
I have a Ramp at home, so I can do most of the spanner work, as long as it's not too complicated. I have a handheld reader which can read codes, clear codes and do data streaming.
Fault Codes
I've finally got my code reader (Carecar AET-1) and the following have shown up:
Warning from ECU error codes menu
P0715 - Tiptronic (supply voltage, speed sensors)
Transmission warning codes
14 - Speed comparison between n2 and n3 comparison implausible
50 - Impermissible transmission ratio
Can I confirm that the transmission in my car (04) is the MBenz 722.6? Here's a good forum answering lots of questions if so:
http://www.benzworld.org/forums/w210-e-class/1463460-mercedes-benz-722-6-transmission-faq.html#/topics/1463460?_k=025ifa