2001 Prius Help - code p3000

P3000 related to the battery ECU
See P3000 - Toyota Prius Hybrid Fault Code Diagnosis - Rennacs

C1259 Malfunction in regenerative of HV ECU

Read more: how can i fix a C1259 -error code on a 2003 prius - AutoCodes Q&A

 

A lot of links you find online about the C1259 are nothing but distractions. C1259 isn't a primary code. It's a code the brake ECU sets when it gets a note from the HV ECU that there's a problem over there. You don't really "fix" a C1259, so much as you mostly ignore it, follow up on whatever code is really from the HV ECU telling you what the real problem is, and when you fix that, the C1259 takes care of itself.

In this case, there's another step like that: P3000 is a code the HV ECU sets, when it got a note about a problem from the Battery ECU!

But you mention having Techstream, so it might be useful to touch the "snow" icon next to that P3000 to get the freeze-frame data ("freeze" frame, get it?), and see what 3 digit INF codes go with it. Seems like about four different possibilities. You could also look at the live data list from the battery.

-Chap

 

A Prolong reconditioning kit or, at least, a Prolong battery charger& harness from Hybrid Automotive may be able to balance the cells. @Raytheeagle or the owner @jeff652 could comment further.

 

The first thing you need to do is look at the freeze frame data for the 3006 to see what information locked in when the battery coded.


For the P3000-123 read here:
https://static.nhtsa.gov/odi/tsbs/2014/MC-10061270-2273.pdf
Basically says don't worry about it, as it's triggered by the Battery ECU fault. Focus on correcting the battery fault.


For the battery fault P3006:
Gen 1 Prius Battery Failure, P3006 - Luscious Garage | Hybrid Specialists

These guys are pretty much the go-to garage for Prii. I doubt there's anyone available who knows more than they do.

Additional info:

P3000 – Toyota Prius Hybrid Fault Code Diagnosis
P3000 – Battery Control System
The P3000 fault code relates to the battery control system in the Toyota Prius. If this code is displaying on your vehicle, it means that there is a problem with the HV battery ECU. The problem can be caused by several different sources, making P3000 a very generic and common fault code.

The P3000 fault code will often be accompanied with a suffix (for example, P3000-388) to help with diagnosing the source of this problem. The definition of these suffixes (or INF codes) can be found below:



P3000-123
Abnormal signal response from the battery ECU, often associated with a high-voltage battery system malfunction.

Possible causes include: HV battery system, Battery ECU



P3000-124
Abnormal signal response from the battery ECU, commonly associated with a blown fuse.

Possible causes include: HV battery system, Battery ECU



P3000-388
Discharge Inhibition Control Malfunction. This code is triggered when the battery’s state of charge decreases due to the vehicle being left in N position, running low on fuel or a malfunction occurring in the HV control system.

Possible causes include: HV control system, HV battery assembly or a fuel shortage



P3000-389
Drop of battery voltage detected by the battery ECU. This code is output if the HV battery is depleted or the battery control system malfunctions.

Possible causes include: HV control system, HV battery assembly

 

Can you post the freeze frame data you have collected. While the spread you report seems small, it can make all the difference.

 

Thanks, guys

 

Per post #6, the P3000 is not where we want to focus. The first thing we need to do is investigate the P3006.

Do you have the freeze frame data for the P3006? I think that will provide us with much better clues, as it will have all the HV battery block info.

 

Your pack looks out of balance.

Do you have a way to balance it or the individual cells?

Did you balance the cells you swapped in? What were their date codes?

Keep us posted .

 

You have significant issues with blocks 6 and 7, or the measuring of block 6 & 7. Focus your energy there. Check the sensor wires and the plug connector. What voltages do you get when you use a multimeter to check them?

 

Just to be clear, this means there has been a HV leak to ground detected, not a physical module is leaking, although one can lead to the other. So check for traces of electrolyte in the case. If these are original Gen 1 modules, they were known for leaks. The presence of leaking electrolyte enables a path for the HV to leak to the chassis ground, something that, I think you'll agree, is highly undesirable.

 

dlfoster,

Look at the photos you provided. Certain things jump out as being obviously jacked up. Like Blocks 6 and 7. Your problem most likely stems from the items discussed in post 14. Although not ideally balanced between all the other blocks, something with 6 and 7 or the sensing circuit for 6 and 7 is your culprit. I can't help you anymore than that.

 

Find any and all modules that are leaking, remove and replace. While the pack is disassembled, i. e. all modules removed, throughly clean and dry the inside of the case. Thoroughly clean and dry all modules you intend to reuse, as they can easily have been contaminated by the leaking modules. Check all wiring for damage while you're at it, too.