Ganea volleyed in Seol Ki-Hyeon's near-post cross to cancel out Preston substitute Dixon Etuhu's first-half header from Paul McKenna's corner.
David Jones hit the inside of a post from an acute angle for North End and Darren Anderton went close for Wolves.
Preston boss Billy Davies:
"I'm pleased with the point but we should have been further in front than one goal at half-time.
"We played good football and created plenty of chances. In the second half we controlled the game but we hit the post and that was the turning point.
"If that went in, it would have been over. That's only four defeats in 15 but we keep drawing and that's down to being unfortunate in front of goal."
Wolverhampton: Oakes, Edwards, Lescott, Gyepes, Naylor, Anderton (Olofinjana 75), Kennedy, Davies (Cameron 75), Seol (Clarke 85), Ganea, Miller.
Subs Not Used: Craddock, Postma.
Sent Off: Ganea (70).
Goals: Ganea 59.
Preston: Nash, Alexander, Lucketti (Mawene 28), Davis, Hill, Mears, McKenna, Jones, Lewis Neal (Sedgwick 78), Nowland (Etuhu 44), Agyemang.
Subs Not Used: Dichio, Ward.
Booked: Davis, Lewis Neal.
Goals: Etuhu 45.
Ref: T Kettle (Berkshire).