That's pretty much what happened in my case...I went around and checked every connection (including earths) I could find, cleaning and spraying WD40 as I went, but that bloody light kept on bugging me! I have the same model Autel as you and it kept showing the code until something I read, on this forum or where ever...leave the drivers door open, keys in your pocket, disconnect battery, go and have a cuppa for an hour..come back...hook up the battery (must be fully charged)...connect the Autel and turn on the key (don't start yet)...read codes and clear whatever comes up...turn off key and unhook Autel. Wait 5 minutes and start the car. It worked for me and after nearly 8 months, has never happened again.
Not saying that it will work for you, but it's a free try.