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About the only thing I can think of you can do is disconnect the PCM connectors and clean them and dress with deoxit gold. Hope a bad connection is causing your grief. It could be a bad connection inside the PCM as well. The intermittent error in the PCM feels like a bad solder joint or dirty connection
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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