Two blinks is kind of obscure. Here is what the controller manual says :
2 Handbrake fault I Direction selected with handbrake
switch active.
Release handbrake
2 Sequence fault DI Any drive switch active at power
up.
Reset drive switches
2 SRO fault DI FS1 active for user configurable
delay without a direction selected.
Deselect FS1 and
select drive
2 FS1 recycle DI FS1 active after a direction change Reset FS1
7-6
LED
flashes
Fault Level Set conditions Operator action
2 Seat fault DI Valid direction selected with
operator not seated or operator is
not seated for a user configurable
time in drive.
Must be seated with
switches inactive
2 Belly fault DI Set after belly function has
activated.
2 Inch sequence fault DI Inch switch active along with any
drive switch active (excluding inch
switches), seat switch indicating
operator present or handbrake
switch active.
2 Invalid inch switches DI Inch forward and inch reverse
switches active simultaneously.
Both inch switches
inactive.
2 Two direction fault DI Both the forward and reverse
switches have been active
simultaneously for greater than
200 ms.
Reset switches
2 Invalid steer switch
states
VS Steering switches are in an invalid
state, for example, both outer
switches are active.
Check steer switches.
https://www.thunderstruck-ev.com/images/TS Vehicles 9-7-11/Gen4 Product Manual V3.2.pdf