[PrincessCayenne]

What does this mean? It happens every once in a while (most of the time the display is normal)

Thanks!

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[geoff]

PrincessCayenne, on Jun 18 2009, 04:33 PM, said:

What does this mean? It happens every once in a while (most of the time the display is normal)

Thanks!

Are you asking why it says "Main Menu"? If yes, then you have cycled through the display settings and you are at the on-board computer (OBC) option.

[PrincessCayenne]

Haha no - I was asking about the D (the section that cycles through your gears, P, N, R) - it usually does that for me, but every so often turns into a solid square with a D in it

[mudman2]

Well that makes a bit more sense, its hard to see in the photo. I have seen that before and if my recall is correct it was the display, not broken outside of tolerances, (i.e. no warranty replacement) Try moving the stick to manual and then back again when it does that, to see if it fixes it.

PrincessCayenne, on Jun 19 2009, 10:23 AM, said:

Haha no - I was asking about the D (the section that cycles through your gears, P, N, R) - it usually does that for me, but every so often turns into a solid square with a D in it

[cayenne69]

I got the same problem last fall. Just changed the coil pack and sparkplug and in my case I never seen this display again.

[DSPTurtle]

Porsche just changed my whole instrument cluster under extended warranty because the display was "flickering". Not a bad as yours! But, after they were done I talked to the technician and he told me that cracked pencil coils can cause all sorts of weird problems in the display area as well as other instrument cluster issues. He also changed all eight of those. The good news for a DIY is that changing the coils is easy and relatively cheap. The updated part number sells for around $20 each... you need eight of them.
JB
2004 Cayenne S

[PrincessCayenne]

Thanks!
So now the check engine light shows up the same time as the wierd D (and disappears once the display goes back to normal - after a few drives).

The diagnostic showed the following codes:

17225
Oil pressure switch 1 transmission
Short to ground or positive

P0700
Transmission Control System
(MIL Request)

Any idea what this means?

Thank you!

[Loren]

PrincessCayenne, on Jun 24 2009, 10:05 PM, said:

Thanks!
So now the check engine light shows up the same time as the wierd D (and disappears once the display goes back to normal - after a few drives).

The diagnostic showed the following codes:

17225
Oil pressure switch 1 transmission
Short to ground or positive

P0700
Transmission Control System
(MIL Request)

Any idea what this means?

Thank you!

P0700 CE Light on Due to Transmission Fault - (Signal Implausible)

Possible fault cause
- Fault memory entry in Tiptronic control module due to transmission fault

17225 is not a valid Porsche fault - could you check the fault code again.

[PrincessCayenne]

hmmmm, that's exactly what the fault paper says - that number followed by the description (Oil pressure switch 1 transmission. Short to ground or positive)

[Loren]

Is this a MY2009?

[PrincessCayenne]

I'm not really sure...it was done at the shop. Would a scan of the actual reading help?

[Loren]

PrincessCayenne, on Jun 25 2009, 02:18 PM, said:

I'm not really sure...it was done at the shop. Would a scan of the actual reading help?

I am asking what model year your car is? (because I don't have fault codes for model year 2009 yet).

[PrincessCayenne]

It's a 2004 Cayenne S (V8)

[Loren]

What was the diagnostic software?
PIWIS? PST2" Durametric?

[PrincessCayenne]

Here is the paper I got from the shop with the fault code

Attached File(s)

•  img031.pdf (199.45K)
  Number of downloads: 28

[Loren]

That is a Durametric fault printout.
Let's say the description is right but the fault code is not.
In that case...
Fault code P0840 Oil pressure switch 1, transmission [Transmission Fluid Pressure Sensor/Switch IAI Circuit]

Possible causes of fault
- Mechanical fault, oil pressure switch 1 signal stays 'ON' for more than one second. The Tiptronic control module carried out an electrical check on the electrical wires and oil pressure switch 1 and found them to be OK. Oil pressure switch 1 jams/sticks mechanically.
- Mechanical fault, oil pressure switch 1 signal stays 'ON' for more than one second. The Tiptronic control module carried out an electrical check on the electrical wires and oil pressure switch 1 and found them to be OK. The shift solenoid valve C1 (modulation pressure) jams/sticks mechanically.

One of those two needs to be replaced.

[PrincessCayenne]

Okay thanks. Is this something that should be done ASAP? I believe this code came up a year ago on a diagnostic but hasn't triggered the CEL until now
Thanks so much!

And are those big jobs?

[Loren]

This fault code should be verified with a PIWIS tester.
Both are accessible through the drain pan.
Oil pressure sensor is about a $50 item and I don't see individual valve pricing so you might have to buy the whole block (about $1014).
So if you are lucky it's the switch, anew pan gasket and new ATF fluid.