New visitor needs help with hybrid battery error codes

welcome!

how many miles on her?

original battery?

any work ever been done previously?

 

do you think tech stream would be more helpful than doc prius?

 

No thinking cap required. Your HV battery is bad. Block 12 may have been the weakest, but they are all the same age and mileage. Unless it's a catastrophic failure of a module, there should be little difference between them.

 

How are you determining which are blocks 12 and 14? The blocks are counted starting from the end opposite the electronics. Do you also realise that blocks consist of 2 modules? Block 14 would be the two modules (27 & 28) closest to the electronics.

I suspect you may have actually swapped one module from block 9 (module 17) with one module from block 8 (module 15), if you only swapped 2 modules rather than 2 blocks. Even if you are counting from the correct end, but swapped two modules rather than blocks you would have swapped module 12 (from block 6) with module 14 (from block 7). Either way you made no change to block 12.

All this is academic, what 2k1Toaster has said is probably more to the point.

 

That being the case, I'm wondering why the fault code did not move to block 14 when you swapped the 2 modules of block 12 with the 2 modules of block 14. Presumably you put a voltmeter over these 4 modules and found no significant voltage variation. If all these assumptions are correct, it would have me leaning to check all the harnesses and connections. Maybe you did not get everything correct when you replaced the buss bar and harnesses. Did the plug/socket into the ECU look clean and free from corrosion/burnt pins?

I'm not sure how Dr Prius works for clearing codes, but in Techstream you can go into a specific ECU and just clear the codes for that ECU or you can clear all codes globally.

Also, any chance Dr Prius is bringing up old scan information and you are not seeing fresh data when you do a subsequent scan?

Codes for HV battery faults can be set over multiple ECU's (eg ABS, HV battery) so if you just clear the HV battery ECU, then others could be left. If you clear a code and it comes back, then the fault is not fixed.

 

Honestly bro, we are here to help. Give the site a chance and you might be surprised

 

When you clear the codes, all the ECUs are cleared, you even lose the emissions data. If it comes back after being cleared, it is being registered again.

Since you are good with high voltage, and you are in Florida (your location info) I would look at the HV Battery ECU, especially the connector. It is a known problem in high humidity and corrosive environments (like salt washes) that the connectors can start being eaten through and eventually the magic smoke escapes and it doesn't work anymore. As this happens the readings of the module can be suspect because there is another path for the sense current to go other than into the ADC.

 

The results you are getting certainly suggest that you are mistaken.

No, there are no secrets to clearing the codes. Just disconnecting the 12 volt battery will clear most codes. If the codes return the problem is still there.

Try running a forced charge and discharge while monitoring the block voltages with Dr Prius. Hybrid Assistant & Reporter is another excellent app for battery work.

 

Did you do a continuity check on the sensor wire for that block 12? Your sensor wire may have a break or a crack in the tab that causes the faulty reading when the modules are not the issue. I am nor replacing one such harness that got corroded ALL the way from the battery end and into the battery controller. CORROSION!