Recently I had the yellow light , ! Over the car , come on . No power to my throttle. Turned key off then on, light went out. Drove to town and back ( 40 km) all ok. Charged car up on level one completely until it shut off. Drove 35 km where I had the light come on, and subsequent loss of power, once more. Turned off, then back on, light out, on my way. Destination charged almost back to full and proceeded to have the light come on four more times on my way home. Basically whenever any kind of acceleration was called for, let’s say beyond 2 o’ clock it’d kick out. Also of note was the turtle symbol flashed a couple of times in all this, again with a heavy acceleration. I should say here that I’ve recently changed out my 12V , when I had the infamous charger issue six months ago.
I don’t have any battery monitoring gadgets so had it towed to the dealership to have a diagnostic test done. Their four page report was all on the DTC code they apparently got, P1A29. Motor over current ( EMCU) with the flow chart from the service manual. Page one, circuit diagram of inverter - ECU. Page two, showing check list of three bullet points, point one ;H/V connectors, G07, G08, G09. Point two, malfunction of the EMCU, point three, malfunction of the motor ( EMU). Well they cleaned the three connectors, (although I had no additional charge over my $120 diagnostic fee ) where they said they found corrosion, but same code came back up. So next is the EMCU. Cost installed $10,000 CAN. Actually a little over but hey, we’re friends here. Needless to say, my liquor cabinet has been taking a beating!
I presumed the diagnostic would have included a look at the battery seeing as it’s a high voltage issue but apparently not. So in desperation I’ve asked them to hook it up again to see if any cells show up weak. Thought I may be able to point the finger there as the problem. Or that the battery is suspect as well as , or because of , the failed EMCU. Or visa versa.
I’ve read through many of the posts here where low cells have shown to be the cause of failure and subsequent warranty. So in preparation for the ensuing report can anyone tell me what constitutes a failed cell? How much lower voltage than the rest? Is there a particular test I should be asking for? Thanking everyone in advance. This forum has already got me through the charger issue with its wealth of information.