1998 S70 transmission slipping in 3rd gear

shawrav4 · Post by **shawrav4** » 13 Dec 2014, 22:22

I drive an S70 with 186000 miles...my gear slips in 3rd gear .....thou no arrow light on or flashing, instead am having a code P0734 and P0445..i replaced the purge valve and cleared the codes..they came back on again....not sure what to do.....i have had the transmission fluid flushed several times. do i need to replace the PNP switch and evap canister? or buy another transmission?

GrizzlyA29 · Post by **GrizzlyA29** » 13 Apr 2025, 19:35

Hey. I am having this exact problem. Did you ever get it resolved? What was the solution? Thanks!

Post by **abscate** » 14 Apr 2025, 01:41

It’s worth a few drain and and fills to refresh fluid in a Volvo transmission, assuming it’s an AT, but a single gear slipping also points to a solenoid failure.

Hers the solenoid shift chart

VALVE BODY SOLENOID APPLICATION (1)
Shift Lever Position No. 1 Solenoid No. 2 Solenoid
“D” (Drive)
1st Gear …………… OFF …………………. ON
2nd Gear …………… ON ………………….. ON
3rd Gear …………… ON …………………. OFF
4th Gear …………… OFF ………………… OFF “3”

Bit strange thst gear 3 would slip without gear 2 also slipping for a pure solenoid failure

yanga001 · Post by **yanga001** » 14 Apr 2025, 06:13

Check motor mounts, flex on the shaft caused me to have slip and it popping out of gear on the highway. Fluid changes did not solve it and it would not throw a flashing arrow code when it did happen.

If there is excessive sag then I believe it causes too much friction