have checked and cannot see a bulp out any ideas?

 

I HAD THE SAME PROBLEM AWHILE BACK. CHECK THE LINK POSTED BELOW. I REPLACED EVERY BULB IN BOTH SIDES OF THE TAIL LAMPS AND FINALLY GOT THE PROBLEM TO GO AWAY. I BELIEVE MINE WAS THE REAR FOG LAMP BULB THAT WAS THROWING THE CODE:

https://volvoforums.com/m_92593/tm.htm

 

finally found it the rear right inside bulb

 

Cool !!