This bulletin applies to 2021 Acura ILX and 2022 MDX vehicles. The MIL may be on with DTC U0155 (lost communication with Gauge Control Module). During certain conditions after conducting an evaporative emissions leak check, a mismatch in control module shutdown commands results in this DTC being set. The fix: update the PGM-FI software using i-HDS software version 1.006.026 or later and HDS software 3.104.014 or later.

YEAR/MODEL                                                                            SYSTEM                      PROGRAM ID (or later)
2021 ILX Base, Prem, Tech.....................................PGM-FI.................37805-R4H-C420
2021 ILX Prem (A-Spec), Tech (A-Spec)...................PGM-FI.................37805-R4H-C520
2022 MDX Base, Tech.............................................PGM-FI.................37805-61A-A450
2022 MDX AWD models.........................................PGM-FI..................37805-61A-A750