P0A78: owner reports and bulletins
Got P0A78 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.
What owners report to NHTSA
14 complaints filed with NHTSA mention P0A78, 14 of them since 2015, across 9 different models. The component owners most often filed it under: power train.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| CHRYSLER PACIFICA PLUG-IN HYBRID | 3 | 2024 |
| CHRYSLER PACIFICA | 3 | 2021, 2023 |
Manufacturer service bulletins that name P0A78
14 technical service bulletins and manufacturer communications filed with NHTSA mention P0A78, from 7 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- CHRYSLER PACIFICA PLUG-IN HYBRID (2024), bulletin 11008207: "Flash: Hybrid Control Processor (HCP) and Auxiliary Hybrid Control Processor (AHCP) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the f…
- JEEP WRANGLER (2021), bulletin 10242816: Power Inverter Module (PIM) Replacement Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following DTCs have been set: ? P0A78-00 - Drive Mo…
- TOYOTA PRIUS (2010, 2011, 2012, 2013), bulletin 10235231: DP: The Customer Confidence Program is a component of a class action settlement that includes several elements of coverage. The Customer Confidence Program provides coverage as it applies to the intelligent power module …
- HONDA CIVIC HYBRID (2012, 2013, 2014, 2015), bulletin 10184658: "Service Bulletin - The Motor Power Inverter (MPI), also known as the Intelligent Inverter Unit (IIU), may fail over time due to a defective solder joint. This failure may result in one or more of the following DTC(s): -…
- ACURA ILX HYBRID (2013), bulletin 10184664: "Service Bulletin - The motor power inverter (MPI), also known as the intelligent inverter unit (IIU), may fail over time due to a defective solder joint. This failure may result in one or more of the following DTC(s): -…
- HINO JHD2 (2011, 2012, 2013, 2014), bulletin 10117677: SB-15-020 CORRECTION OF WORKSHOP MANUAL FOR HINO 155, 195, 155h, 195h (REVISION OF TROUBLESHOOTING PROCEDURE FOR THE DTC P0A78 (TC15)
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.