Old thread, but I think I have the same problem: After beeing away from RC cars for 25 years, I bought a barely used Traxxas Summit 1/16 xl2.5 today. After charging, it did react to steering, but no forward nor reverse. I tried to calibrate the ESC, and after some 20+ tries it succeeded. Then after re-charing the battery (NiMh), it won't go forward/reverse again, and I'm not able to calibrate the ESC: It blinks red, I push full spead ahead and nothing happens.

Any idea?