P05A0: owner reports and bulletins

Powertrain (generic, all makes). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

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What owners report to NHTSA

5 complaints filed with NHTSA mention P05A0, 5 of them since 2015, across 3 different models. The component owners most often filed it under: electrical system.

Most-reported models

VehicleComplaintsModel years reported
VOLKSWAGEN JETTA32015, 2017

Manufacturer service bulletins that name P05A0

7 technical service bulletins and manufacturer communications filed with NHTSA mention P05A0, from 3 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • MAZDA CX-30 (2020, 2021, 2019, 2022), bulletin 10228664: Some vehicles may exhibit the following symptoms with DTC P05A0:00 (Active air shutter and the opening angle abnormality (sticking)) stored in memory. Symptom 1 [Mazda3 and CX-30]: The active air shutter is working, but …
  • SUBARU LEGACY (2015, 2016, 2017, 2018), bulletin 10131689: This bulletin announces the availability of reprogramming files to optimize the ECM and address the following customer concerns: ? Check Engine light coming on (with DTC P05A0 stored in memory). ? Potential battery disch…
  • SUBARU FORESTER (2017, 2015, 2016), bulletin 10117535: This bulletin announces the availability of reprogramming files to optimize the ECM and address the following customer concerns: * Check Engine light coming on (with DTC P05A0 stored in memory). * Potential battery disch…
  • SUBARU IMPREZA (2017), bulletin 10131691: This bulletin announces the availability of reprogramming files to optimize the ECM. The new logic will address isolated customer concerns of a hesitation and / or a stumble felt on light acceleration and in some cases, …
  • VOLKSWAGEN JETTA (2015, 2016), bulletin 10135063: Customer states the MIL light is on, DTC P05A3 and/or P05A0 in the ECM. Fault code being stored in the ECM due to the incorrect software within the motor of the Active Radiator Grille. Updated Active Radiator Grille part…

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.