Maybe those are good places to start with, then. Clean battery terminals and check its voltage and the alternator's with a multimeter. Even if that's not the problem here, it's still a good thing to do. A weak battery/alternator and/or corroded cables can lead to all sorts of unexpected system gremlins.
Next, change the VTM fluid if you don't know when or if it's been done.
If you don't have a code reader handy, some car part chains in the US will read codes for you on site for free.