This is a common problem on the V/S40's - it's most likely the POT that has failed or is failing. Sometimes you can bring it back to life by spinning it back and forth many times but other times you are stuck taking the CCM out and desoldering the POT and replacing. I've done the latter successfully on my V40 and it completely solved my issues. Not sure if this helps or not. Or you could head to the wreckyard and get a replacement CCM.
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2003 V40 1.9T B4204T4, 197,000miles (sold but alive!), 2004 S60 2.5T, 160,000miles, 2010 V70 3.2, 125,000miles, 2002 V70XC 2.4, 175,000miles
Click here for my x40 and V70 P3 repair guides
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