My 1999 V70 N/A fwd auto, entered into limp mode while driving through heavy rain. It only had 3rd for a fwd gear. It gave the following codes, P0478, P1057, P1081. I pulled the pan and ohm checked the solenoid all were 14-15 ohms, fluid was full and clean. I cleared codes out and they eother will come back immediately or after a few seconds. The only consistent code was the O2 sensor. The others would vary. Any ideas on the problem? I tried the shifter row 20x to no avail. It has 156k

 

Update it now just repeatedly throw P0748 pressure control solenoid. Reset the code and as soon as the key goes in it trips it. Is there a pressure control solenoid ?

 

Ohmed the pins all solenoid but the lock up solenoid are good. Lock up is reading open

 

I can't decipher the codes, but if I were you, I would make sure I knew what the transmission computer had to say. It chose to go into limp mode and it may be way off base about what it thinks, but it'll at least tell you what it thinks. Those might all be engine codes but I'm not sure.

 

I'm beginning to believe the tcm may be faulty.

 

Ohm checking the solenoids does not give an accurate reading when warm. You can have great ohms when cold but when hot, failure.

 

Ohmed them cold and with trans warm