Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
HONDA
Reported code forms P0A78
"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):…
SUBARU
Reported code forms P0A78
HYBRID MODELS ONLY. This bulletin announces the availability of reprogramming files to optimize the ECM and address DTCs P0A78 and P1C2A. When either of these DTCs is stored, the Hybrid/HEV functions are inoperative.…
CHRYSLER
Reported code forms P0A78-00
Flash: Hybrid Control Processor (HCP) and the Auxiliary Hybrid Control Processer (AHCP) This bulletin involves a combination reprogramming of the HCP and the AHCP with the latest available software. Customers may…
HINO
Reported code forms P0A78
SB-15-020 CORRECTION OF WORKSHOP MANUAL FOR HINO 155, 195, 155h, 195h (REVISION OF TROUBLESHOOTING PROCEDURE FOR THE DTC P0A78 (TC15)
HINO
Reported code forms P0A78
SB-15-020 CORRECTION OF WORKSHOP MANUAL FOR HINO 155, 195, 155h, 195h (REVISION OF TROUBLESHOOTING PROCEDURE FOR THE DTC P0A78 (TC15)
CADILLAC, CHEVROLET, GMC
Reported code forms P0A78
CADILLAC/CHEVROLET/GMC: SERVICE HYBRID SYSTEM MESSAGE AND OR SERVICE ENGINE SOON LAMP ON. ENGINEERING WOULD LIKE INFORMATION ON VEHICLES WITH DTC P0C19, P0C1A, P0A78, P0A79, P0C0B, P0C0E, P0BFD, OR P0BFE. RETRIEVE AND…
TOYOTA
Reported code forms P0A78
MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0A60, P0A63, P0A72, P0A78, OR P0A7A. *TT