When the PDK transmission overheats, is there a specific message that says the transmission is overheating? Or will the car just flash the "Transmission Emergency Run" message?

Also what exactly is the optional third radiator cooling? Does this directly affect transmission temperatures?

 

Yes, there are a few combinations depending on the specific case. You should also see the transmission emergency run text in the MFD, white letters or red letters, depending on severity. White text usually can reset by stopping and turning off the car and cycling through the ignition and the restarting the car. But it may return if the sensor or wire crimp is bad (see below).

The codes are: P0711 & P172D with P17F0, P17F1, and/or P17F2 They are stored in the PDK control unit/module. The P172D is a temp sensor gradient fault and is usually associated with a bad crimp in the temp sensor wire, but can also be a temp sensor itself. P0771 is an implausible reading in temp sensor and finally P17F0-F2 is a transmission over temperature fault.

If the P172D is the wire crimp then it can be repaired at a Porsche dealer (the wire crimp can only be repaired once ... if it fails again, a new PDK is required). The other errors are less likely to be repaired and a replacement PDK is often the current remedy. Many of us are hopeful that soon PDK repairs will be more common place with things like simple fluid leaks (i.e. seals and gaskets) and temp sensors becoming routine repairs.

 

bad temp sensor crimp = new pdk? seriously?
something wrong with this picture

 

^^^
Unfortunately at this time yes for several reasons. There are a few rather delicate steps, one is the actual crimp itself (using only the Porsche special crimping tool) and the voltage and another is the length of wire needed to connect, measured in mm. I believe I posted the details a while back in another post on PDK. And finally it is PAG that kills the repair. If PAG will not approve the proposed repair, say for example a second crimp, then the dealer can only replace the unit and somebody has to pay for it - warranty = PAG or the non-warranty = customer (with perhaps some subsidy from PAG/PCNA).

Once some indy shops determine they can make money doing PDK repairs, there may be alternatives, but for now no indy shop wants to be on the hook for a replacement PDK unit from Porsche should their repair work prove to be unsuccessful.

Here is excerpted info direct from PAG on part of the wire repair/crimping .


Figure 4

9.2 Slide insulated cable connection sleeve over the stripped area of the line as far as the insulation.
All strands of the line must be covered (crimped).
If more than two strands are sticking out of the insulated cable connection sleeve following
crimping, the PDK transmission must be replaced.



Figure 5

9.3 First hold the insulated cable connection sleeve firmly in the
red crimping jaw of the crimping tool (do not press together).
Make sure that the edge of the insulated cable connection
sleeve is aligned with the edge of the crimping tool → Figure 5.
9.4 Guide the new cable with temperature sensor as far as it will go into the insulated cable connection
sleeve. Check that the line colors are assigned correctly.
All strands of the line must be in the insulated cable connection sleeve.
If more than two strands are sticking out of the insulated cable connection sleeve following
crimping, the transmission must be replaced.
9.5 Crimp the insulated cable connection sleeve using the red crimping jaw of the crimping tool.

 

Dear lord. That's a tough pill to swallow. Sorry, you have a problem with 1/100 of one cent's worth of wiring. You need a new $18,000 transmission.

 

yikes. that is craptastic.

it might be possible to figure out how to code for ignoring the temperature sensor. I mean.. if you're facing having to get a new gearbox from the temp sensor alone there isn't much to lose by doing that. Assuming it would be possible to code for it somehow.

 

 

OMG, I didn't see this info in ANY article I have ever read concerning PDK transmissions. That's one hell of a dark secret.