The “TM system malfunction” is a pretty common warning that you can see in the first generation of the Nissan Leaf, and it actually means the transmission system function. But the problem is that this warning is almost never about the transmission. So, literally, when you have this “TM system malfunction”, it means that control modules in your car—they can't understand what position your shifter is in. But the initial culprit is almost always the battery—the 12V battery, not the big EV battery, but the small 12V battery. And it means that this battery doesn't supply the system with proper voltage, and now your car brains start glitching, and you see this warning and maybe some other warnings. So, the first thing you should do is to check this battery with the load tester and maybe charge this battery with a proper external charger. If the battery is quite old, like four, five years, you may replace this battery with a new one and check if the problem disappears. But the bad news is that sometimes this will not fix the problem for a long time, and you will still need to find the actual culprit of this. And in most cases, if it's not just the low voltage in the battery, it's the PDM system—or power delivery module, if I'm not mistaken, system. The PDM is the DC-DC converter. Actually, it's called a converter in other cars. And the PDM is the unit that supplies the small 12V battery with the power using the voltage from the high-voltage battery—from the EV battery. And if this PDM module is broken, it means that the small 12V battery will not get any charging at all when you drive. So, you installed a new battery, you drive for several days, and you again get this “TM system malfunction”. It means that the problem is not with the battery initially but with something that charges this battery. And in most cases, it's PDM. Now, the problem is that the PDM costs thousands of dollars if you buy it new from the dealership. And it's—of course—it isn't worth it because the car is quite old, and buying something that costs $4,000 is not a good deal. So, what you may do—you may find a PDM from a wrecked car. You may find a used PDM, and some sellers will even have a one-year warranty for the PDM modules. And you can buy them, you can install them, program them, and keep driving your Leaf further. What usually kills these PDM modules is when you charge your car during the thunderstorm. I noticed that a lot of Leaf owners reported they were charging their cars during a thunderstorm, and suddenly after that, their cars started showing these PDM module problems. Of course, it's not a good idea to charge your vehicle when there is a huge thunderstorm or even heavy rain because it may affect all these connections. Also, in several vehicles, I have seen this “TM system malfunction” warning because of the wet wiring. And it's a disaster to find this—to find the culprit in this case. It's absolutely impossible, and you will need to dry whole car and try to find the corroded cables, corroded connections. And since it's an electric vehicle and there are thousands of connections, it's not that easy to inspect this vehicle and to find the root problem. So, of course, you will need some professional help if this is your case.