It would be helpful if you would say which engine you have, and how you've found this fault.
However: 'intermittent' means that it could have happened only one months ago. With the intermittent faults, unless theyre obviously related to physical symptoms that you're experiencing, just clear them and see if any come back.
It somehow disappeared after I got the rest of the codes cleared.
Sometimes it was there, sometimes not, when I was getting it, it seemed kinda that it just happened sometimes when operating PP2000 and if I let the car alone for a while they would be gone.
But if I had PP2000 on for live data reading, swithcing the ignition on/off several times etc. that code would suddenly appear.
Not seen it since those times when I was using PP2000 like a madman to get rid of all my codes.
As long as the car actually starts and stops as it should I wouldn't worry about it.