Multiple codes 1997 volvo S90

mkgray59 · Post by **mkgray59** » 14 Jul 2015, 08:06

I have PO500,PO755,PO705 code.
Both speeds sensors are new, PNP switch is new. Common thread seems to point to TCM. Car starts and runs great, especially after resoldering the instrument cluster. Any advise would be appreciated.
Thanks Mike

93Regina · Post by **93Regina** » 14 Jul 2015, 23:49

mkgray59 wrote:PO500,PO755,PO705 code

One might Google:

P0705 Volvo

P0755 - Shift Solenoid B

Speed sensor A - (error code P0500)

mkgray59 · Post by **mkgray59** » 15 Jul 2015, 07:25

Thank you for the quick reply. I will ohm out the B selonoid and then check the ABS module solder joints and clean connections at the ECM and TCM next.

mkgray59 · Post by **mkgray59** » 15 Jul 2015, 18:15

Update 3 solenoids ohm out at 12.9
TSP voltage 0.5 to 5.2 volts DC while manually moving throttle.
Speed sensor on the transmission checks good as compared to old speed sensors. Pulled TCM cleaned connecters with deOxit. Reinstall still the same codes.
I believe its the TCM. Any thoughts?

17yearsofboost · Post by **17yearsofboost** » 25 Jul 2015, 13:05

Any luck? I got the 0705 after changing the pnp as well. I've been told it's still slightly out of adjustment, even though lights and ignition work fine. Did you use oem speed sensors? Sounds like one isn't communicating still. If you are getting correct coil resistance (between 10 & 15 ohms) at solenoid B, my guess is you now have a faulty solenoid itslef. Rostra transmission makes a replacement shift solenoid. New fluid and filter while you are at it.

17yearsofboost · Post by **17yearsofboost** » 25 Jul 2015, 13:06

I don't think it's the TCM honestly