I understand the outside/battery temperature and charging issue, but I'm still getting the brake warning light, ABS warning light, and "check brake system" message on some cold weather starts. It happened again this weekend, a few days after my Ford dealer service shop searched for, but was unable to find, any problem or current error code during a 70k service. Outside temperature was 17 degrees. The warnings came on and stayed on upon ignition start. After a minute, I turned the ignition off, waited briefly, then restarted, as was suggested here to reboot the vehicle computer. This time, all three warnings stayed on for about 10 seconds then went off. Hydraulic brakes appeared to function normally, though no regen braking due to the cold. This issue occurs only in cold weather at Lake Tahoe and never in warmer weather off the hill.