One problem related to alternator/generator/regulator has been reported for the 2007 Toyota Corolla. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Toyota Corolla based on all problems reported for the 2007 Corolla.
On Friday, March 12, 2010, I was driving my 2007 Toyota Corolla home on my lunch hour and my car stalled twice on a sharp turn. I nearly lost control on the turn because the steering became (quite unexpectedly) very difficult. At first I didn't realize the car had stalled, causing the steering problem. That was the first time the car stalled. I immediately took it to my local Toyota dealership. They said it could be a computer problem, battery, alternator, etc. , and they'd run diagnostics on it. After being there over four hours, all they said was that the battery was "marginal" but it took a charge. I asked about putting in a new battery and the service rep said he didn't want to do that. I wasn't charged for the diagnostic or battery charge. I believe, now that I've heard about the stall issue today in the news, that this problem is why I wasn't charged for the diagnostic test; however, I was not informed there have been problems with stalling.