DTC Codes C1259 C1310

probably best to run tech stream and check sub codes

 

You might not need to. I am not familiar with the various models of Innova scanners, but if it can interrogate the ECB and the Enhanced VSC ECUs, it probably should be able to dig down into the freeze frame data, which is where you will find any sub-codes.

I would think there would be more codes in the battery ECU for you to report. The two codes you mentioned are set by the ECB ECU and the Enhanced VSC respectively and are code that merely acknowledgment codes to say they heard from the battery ECU that it had a problem.

C1310 = Malfunction in HV system
C1259 = HV System Regenerative Malfunction

They don't really tell you much except to prompt you to go look to see what the battery ECU has to tell you.

 

"Powertrain" is probably in reference to the engine management computer (EMC), so no surprise there. Maybe your scanner is only a basic "engine, brakes and airbag" model. Maybe it can be upgraded, or maybe you just need a better more capable model.

 

These are Inverter/Converter faults and match your performance experience. First check would be to ensure you have HSD coolant flow, if that is normal, it seems most likely that the Inverter/Converter has suffered an internal event.

 

C1259 and C1310 are both codes that the brake/skid ECU will set only because it has been told by the Hybrid Vehicle ECU that there are codes set over there.

The brake ECU doesn't know what the HV ECU codes are, whether inverter/converter or something else. They can only tell you to use a code reader capable of querying the HV ECU for its codes so you know what it's going on about.

The brake ECU gets notified of the existence of HV ECU issues so it can make its own adjustments and not count on regen capacity that the HV ECU might not be able to supply.

The C in a code identifies it as coming from some Chassis-related system (in this case, the brakes). Codes from the HV ECU, part of the Powertrain, will start with a P.

 

How do you check sub-codes in Techstream?

 

If any code has a sub or INF code, you would find it by clicking on the snowflake symbol to the left of the main code (that's freeze frame data- a snapshot of data that the ecu records when it sets a code). Part way down the freeze frame data will be lines called "detail" - that's the subcode.

Posted via the PriusChat mobile app.

 

When the codes in question are C1259 and C1310, it's not really subcodes of those codes that you're looking for. Those are just brake system codes that only mean "there are hybrid system codes". So the main thing then is to make sure the scan tool you're using also shows you the hybrid system codes, because those are the ones that will matter. (And it's possible, once you have those codes, there will be detail subcodes for them.)

 

Toyota Prius 2007
I have the same problem 1st my car screen said the showed the overheating temp symbol and then the triangle light turned on when I arrived in Vegas causing the car to turn off. After it turned off it did not want turn on the dash lights were on but no ignition. The car was towed to autozone where the scanner presented these codes U0100,C1259, C1310, and C1378.
The autozone employee said it might be the hybrid battery, but I presumed it was inverter coolant pump. Later I noticed that it was burning out the fuse 15A and the car would drive a bit than would turn off and show the triangle light again. As of now I have changed the inverter coolant pump and replaced the fuses, which caused the check engine light to turn off. As of now when the car is turned on the lights on the dash are normal and you drive for a bit and after a while the triangle light turns on as well as the abs but not the check engine light, also the fuse gets blown and the car starts turning off. Any help would be appreciated. As of now have been told it could be the ecm or the hybrid battery that is causing the problem.

 

I wouldn't rely on any AutoZone employee to know how to diagnose Prius codes. Most people unfamiliar with hybrids seem to immediately jump to thinking a problem with the battery exists.

None of those codes immediately would throw suspicion on the hybrid vehicle (HV) battery.

The C1378 indicates a capacitor communications malfunction. The brake control power supply assembly (capacitor) provides auxiliary power for brake control when an auxiliary battery (12 V) voltage drops.

The FAIL and ENA lines are placed between the skid control ECU and the brake control power supply assembly. Signals indicating that the brake control power supply is in auxiliary mode are sent to the skid control ECU through the FAIL line.

Charge permit prohibition signals are sent to the brake control power supply through the ENA line.

As far as the C1259 and C1310 codes go, I'll just reiterate what ChapmanF said in his post above:

So, it seems the AutoZone reader did not show you the hybrid system codes.

C1378 is set when either condition below is met:

• Open or short in FAIL line
• Malfunction inside the power backup unit

Trouble areas are:

• Harness and connector
• Skid control ECU

The repair manual (more info) has the diagnostic steps to follow to isolate the problem area.

 

Hey can you take a look at this thread and tell me if it sounds like an inverter issue? 2010 Prius Codes: (P3190, P3191, P0A0F, U029A) - Lost power while accelerating | PriusChat