PCM Failure

[terryp88]

This morning when I started up my 2008 C2 coupe, the PCM screen displayed the following error message: "System Error: Navigation System, Amplifier Not Available." I've attempted to attach a picture that I took of the screen.

Has anyone seen this error message before and/or know how to fix it?

After this message was displayed, the Navigation System didn't work and I couldn't get any sound from the radio/cd player. The good news is that when I turned the car off and then on again, the PCM operated normally. However, I'm afraid that it could happen again.

[tekky]

This morning when I started up my 2008 C2 coupe, the PCM screen displayed the following error message: "System Error: Navigation System, Amplifier Not Available." I've attempted to attach a picture that I took of the screen.

Has anyone seen this error message before and/or know how to fix it?

After this message was displayed, the Navigation System didn't work and I couldn't get any sound from the radio/cd player. The good news is that when I turned the car off and then on again, the PCM operated normally. However, I'm afraid that it could happen again.

Seems to me your amplifier located in the loggage compartment is faulty/disconnected. Open up the hood, and detach the cover on the bottom and make sure the wire attachement piece to the amp is secured (latch on the bottom of the block needs to be pushed up all the way for the plug to go in all the way). If that is okay, and it happens regularly, probably a bad amp, should be replaced under warranty and a 10 minute job.

Sam

Edited June 16, 2009 by tekky

[beauar]

Porsche's are known to have faulty electronics. My 03 996 C2 has the same type of issue with the amp. I have to turn off the car and restart it every once in 6 months or so. I have checked all the connections and can't find the culprit. If it happens again drive straight to porsche since you have it under warranty. I would try to make sure it says that on the screen while you are there.

This morning when I started up my 2008 C2 coupe, the PCM screen displayed the following error message: "System Error: Navigation System, Amplifier Not Available." I've attempted to attach a picture that I took of the screen.

Has anyone seen this error message before and/or know how to fix it?

After this message was displayed, the Navigation System didn't work and I couldn't get any sound from the radio/cd player. The good news is that when I turned the car off and then on again, the PCM operated normally. However, I'm afraid that it could happen again.

Seems to me your amplifier located in the loggage compartment is faulty/disconnected. Open up the hood, and detach the cover on the bottom and make sure the wire attachement piece to the amp is secured (latch on the bottom of the block needs to be pushed up all the way for the plug to go in all the way). If that is okay, and it happens regularly, probably a bad amp, should be replaced under warranty and a 10 minute job.

Sam

[Loren]

Porsche's are known to have faulty electronics.

Sorry, I can not agree with that. Porsche does not make any of their own audio or NAV equipment - but then again maybe that is the problem.

[vizcarra44]

Porsche's are known to have faulty electronics.

Sorry, I can not agree with that. Porsche does not make any of their own audio or NAV equipment - but then again maybe that is the problem.

Wow,

I'd like to see who could replace the amp and do the coding and programing from start to finish in 10 minutes. Highly unlikely.

There are numerous TSB's on the Pcm issues, most likely a software update available for this issue. For an accurate diagnosis you will need the Piwis tester to begin with.

[berty987]

If the amplifier is seen as faulty this can either be the hardware itself or posibly the MOST fibre optic cable that connects it to the PCM. There are a number of connection points in the front compartment for the MOST fibre optics. These are black plugs on dual orange cables. Do not touch the inside of the plugs as the fibre optics are sensitive to grease and dust. The cables are made of plastic rather than glass fibre so are generally fairly robust, they must not however be kinked. The MOST loop connects the PCM to other devices as a series or daisy chain, hence two cables in every plug. Depending on the options in your particular car you may have up to 4 or even 5 devices on the MOST loop. You can check the status or list of connected devices by pressing the MAIN and TRIP buttons on the PCM display. A list of connected devices is displayed each of which can be further interrogated by selecting it from the list. More advanced diagnostics require the use of the workshop tool PWIS unit. Devices available on the MOST loop are :

Amplifier - for Bose only

Navigation Drive

CD changer

Telephone telematics

Sirus sat radio

MOST is an automotive industry standard , developed in conjuction with Mercedes, BMW , Audi and Harman Becker amongst others. Harman Becker supply the audio equipment for Porsche.

Edited August 7, 2009 by berty987