P1A2F is a "secondary" code which is set by other codes:Gearhead1961 wrote: ↑Fri Nov 25, 2022 2:28 pm I have the same issue (turtle light comes on under load) with our 2012 SE. The car has about 36k miles and has been absolutely trouble free for the seven years that we have owned it. Until now, that is.
The dealer read the trouble codes and there were several : B1477, B1476, B210D and P1A2F. Since the first three of those codes appear to relate to the 12v battery, I will replace that tomorrow even though it tests good. If that resolves the issue, wonderful. If not, I am guessing that the P1A2F code indicates one or more bad cells.
http://mmc-manuals.ru/manuals/i-miev/on ... 100ENG.HTM
However none of the codes which can cause P1A2F (shown in that article) are listed above, so I must conclude that whatever diagnostic tool the dealer used did not read all the codes or the codes were reset before reading, so some information you need is missing.
It's hard to know for sure when one of the codes (which triggered P1A2F) is missing, but in general turtle light coming on under load at a high SoC means you have one or more faulty (high resistance) cells in the traction battery.I have already tried the battery rebalance procedure (i.e. drain it almost to zero, wait two hours, recharge with slow charger).
Am I missing anything with this?
Your dealer should have been able to diagnose this, but apparently they have not. If you want to have a go at confirming this yourself you can use an android tablet with Canion and Hobdrive using a suitable bluetooth OBD-II adaptor.
Hobdrive works with most adaptors but Canion only works with a limited selection of adaptors. I used Canion with an OBDLink LX successfully for years and it also worked with Hobdrive. (I no longer have one of these cars - I have a Leaf now and use the same adaptor with the Leaf)
Canion can show a realtime graph of all the cell voltages - if you have someone drive the car for you you can watch the cell voltages in real time, watch for any particular cells that drop much lower than others during acceleration and you will find your culprit(s).
If any cell drops below exactly 3.0 volts during driving the turtle mode will instantly come on. Normal no-load voltage of a nearly discharged traction battery is around 3.6 volts per cell.
Hobdrive is a bit more tricky to use (see other threads here for help) but is able to do limited fault code reading and may be able to provide the missing fault codes.