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I just bought a 2004 Cayenne S and it has a funky situation with the PCM unit. Most of the time it won't respond to anything. No screen is on, no sound, nothing. However, once in a while it will randomly turn on and turn off when it feels like it. I would really like it to work correctly, but that's not an apparent option. Any help would be great.

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Also, check your battery - if it is over 4 years old then replace it.

These cars do some funny things when the battery gets weak.

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Yeah this thing does some seriously weird stuff when the voltage is low, but no matter what the voltage is the constant problem is the PCM. There was one time just the radio was functioning beautifully for 2 hours then it died. lol At times it will reset itself, but nothing else. It also messes with my clock when it decides to turn on and keeps rebooting.

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Also, the transmission was replaced in it, but I'm not sure if that corresponded to when the PCM began to act up.

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