Have asked before with no responses but i'll try again....I have a transmission fault that says 'power supply low voltage'. Since everything works fine i would think its just a bad connection somewhere plus if i clear it I can drive for as long as i want without the fault coming up but as soon as the car power is turned off then on again it comes back up. Any ideas???...would like to be able to see the gear i'm in for the tiptronic. Is there a main power connector at the transmission that you can unplug, clean, and plug back in again or is it all hardwired?

 

You probably have a sticking relay, you need to have a tech look at it to track down which relay it is. If there was a connection problem at the TCM, it would be in permanent limp mode.

 

could this be related at all to the fuel pump? i noticed when i changed the fuel filter it took an extra few seconds of the engine turning over to get the fuel back through the line and the fault didnt' come up. maybe just a coincidence though

 

or does this mean that it just gave extra time for a sticking relay to trigger? are there multiple relays for the transmission?