S80 Limp Mode
 

Hey guys so here is the deal with my S80 T6

Its in Limp Mode,

with Check engine codes P0715 and P0756

These are some of the things i have done

I have changed Both solenoids

i have changed TCM

I have changed the Transmission oil

i have checked fuses

i have disconected abs harness

I have left car disconnected from battery for 24 hours (15 min should have been enough)

Here some other information -

When i use OBDII and erase P codes it comes back on INSTANTLY
does this mean its a wiring problem?

I have spent countless hours trying to figure out the problem i have also bought a ALLDATA packet for the volvo but surprise surprise no help there

Quick search returned these results:

P0715 - Turbine Shaft Speed Sensor Circuit
P0756 - Shift Solenoid B Performance or Stuck Off

What year is your vehicle?

I probably know this 0715 is an input speed sensor fault. It could be activated by a difficult mistake in cabling, but the indicator itself may go bad as well.