TSB: Acura ILX & MDX 2021-2022: Gauge Control Module Communication Issue

The bulletin details a problem where certain Acura models display a MIL with DTC U0155 due to lost communication with the gauge control module after emissions leak tests. The recommended solution is to update the vehicle's PGM-Fl software to restore proper communication and prevent false DTCs.
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June 30, 2026
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Acura ILX & MDX 2021-2022: Gauge Control Module Communication Issue

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 test, a mismatch in control module shutdown commands results in the DTC being set. Corrective action: Update the PGM-Fl software.

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