2014 Fiesta ST, 20,500 miles, all stock. This am I started my car as usual, drive the two blocks to the main road and idled for about 3 minutes because of unusually heavy traffic. I then accelerated briskly onto the highway and immediately the wrench light came on. I turned around at the first opportunity and swapped the Fiesta for my very reliable 300,000 mile Miata. I stopped at the dealer on the way to work and arranged for them to look at the car tomorrow. They and the 800 number suggested towing it so that's what I'll do when I get home tonight. The dealer had the car just a week ago to fix a seat rattle and install a new cabin air filter. At that time they performed the standard inspection and noted no issues. The oil was last changed at the same dealer perhaps 1,000 miles ago. Any idea what the issue could be? I'm hoping it's just electrical but my understanding is that the wrench could indicate bigger problems? Would a vehicle health report help any in diagnosis?