TSB: Acura EVAP DTC

This bulletin applies to 2021 Acura ILX vehicles. The MIL may illuminate with DTC U0155 (lost communication with gauge control module).  During certain conditions after conducting an EVAP leak check, a mismatch in control module commands results in the DTC being set.  Update the PGM-FI software with iHDS software 1.006.026 or later and HDS software version 3.104.014 or later.