Error code for 2 flash - Forw + back - This test is conducted continuously. Alarm is indicated when fwd and rvrs are requested simultaneously.
With the handle being hit, I would look at 2 things, tiller loom for damage/shorts as previously mentioned, part No. 8113953 or the Potentiometer, part No. 813533 or NEW 158452
Might check wiring to handle assy
Could be shorted to ground