Did you try and re-program?
To program Honda remote transmitters:
(NOTE: a maximum of 3 remote transmitters can be programmed)
Proceed as follows:
A. Turn ignition to ON position.
within 4 seconds: press LOCK or UNLOCK button on original key
within 4 seconds: turn ignition OFF
B. Do procedure A 2 more times (total of 3 times)
C. within 4 seconds: turn ignition to ON position
within 4 seconds: press LOCK or Unlock button on original key
***System should now lock and unlock vehicle to indicate programming mode is activated***
D. Within 10 seconds: press LOCK or UNLOCK button on original key allowing doors to lock and unlock once
E. Press LOCK or UNLOCK button of each remaining key to be programmed, allowing doors to lock and unlock once as each key is programmed.
F. Turn ignition to OFF position
G. Remove key from ignition.
H. Insert key back into ignition, start the car, turn it off and remove the key from ignition.
I. Check operation of all programmed key remote transmitters. All should function now.