Porsche Cayenne S 2004 PCM microprocessor problem

[Fuzzwana]

Hi,

My PCM is not working. Porsche have done diagnostics and state that the microprocessor has blown and as such I need to replace it. Has anyone had such issues? Is it something that can be fixed?

 

First I had problems with my battery, then the side lights and then the PCM stopped working. They said the other issues were because of the blown microprocessor of the PCM and if I replace the PCM all other faults will be fixed.

 

It is costly to replace the PCM so I don't want to replace it if the root cause is not fixed and the microprocessor blows again!

 

Any advice will be appreciate. Also is there a reputable place I can buy a replacement unit?

 

Thanks

[Nimesh Udani]

I have my perfectly fine PCM 2.1 sitting in the closet if you're interested.  Pls. send me a PM.

 

I replaced it recently with an aftermarket HU.  

 

Thanks

 

N

[clarksongli]

Ask them how they know the "microprocessor" is blown. First off the word microprocessor is very vague. Ask them if they replace the pcm and it doesn't fix the problem are they going to eat the cost....I'm bet their story will change.

Bottom line is you hit the nail on the head.....they have no clue what root cause is....they just guess....and this goes for most dealerships.

You are paying them for a fix....not a bunch of guesses and new parts....If they don't fix the problem then why should you pay? Ask them to prove to you this will fix the problem.