He was later cleared of injury, saying his only complaint was a "bruised ego''.
The 41-year-old rated the incident one of his worst on the mountain.
"It was weird, I had had moments around the track before but not there, it completely caught me by surprise,'' said Murphy, who is without a fulltime drive this year for the first time since 1998.
Coincidentally it was the same place Ford young gun Chaz Mostert suffered a horror crash at Friday's practice.
Murphy's accident prompted the 161-lap race's second yellow flag - but Murphy's teammate Courtney would have been forgiven for seeing red.
Courtney arrived at Bathurst fifth in the drivers' championship, 238 points behind series leader Jamie Whincup.
Instead of whittling away at Whincup's lead, Courtney's dreaded DNF all but sounds a death knell to hopes of adding to his 2010 V8 series win.
Not that Murphy had to be reminded.
"It's his championship (that it affects),'' said Murphy.
"This sort of thing happens every year. But this time around we are the ones feeling bad. I am gutted for James. He has lost a lot of points.
''(But) that's Bathurst''.
- AAP