Need Help with P0A94 for 2013 Prius C

For DTC P0A94, DC/DC Converter Performance, the Repair Manual (more info) gives more than a dozen different procedures, each for a specific INF (information) code, which should be available in the freeze frame data. Some of these procedures just direct the technician to replace parts of the inverter with converter assembly, but others have extensive checks of connectors, wiring, sensors, and so on.

As you may know, DTC C1259 is the skid control ECU acknowledging a malfunction reported by the power management control ECU; since you also have that DTC, you can ignore this one.

As far as I know, none of those recalls, campaigns, or legal settlements applies to Prius c models.

 

The car can't move?

 

The HV battery isn’t listed as a trouble area in any of the P0A94 procedures. (The procedure for P0A94-587 mentions “battery smart unit,” but not the HV battery itself.)

Can the scan tool find the stored INF code? If so, that’s the easiest option, since it distinguishes between situations that may require dozens of further checks of high-voltage and low-voltage components and wiring (as with INF codes 127, 172, and 549, among others), and those in which you can skip ahead to replacing parts of the inverter with converter assembly, immediately (as with INF code 590) or after one or two tests.

I’d also suggest that it’s worth $20 (or less, if you have a library card) to use the Repair Manual from Toyota: many of the diagnostic steps are hyperlinks to other procedures, and for readers unfamiliar with hybrid systems, the manual points out which steps need to be done while wearing insulated gloves.