Check the wiring and pull the speed sensor out and clean it. It may be gunked up and not picking up the signal.

Mike
'95 850T


Here's what the shop manual says:

DTC 232/P0500: SPEEDOMETER SIGNAL MISSING

1) Speedometer provides vehicle speed information to TCM. TCM
uses signal to determine whether transmission changes gear at correct
speeds. If DTC 232 is set, use scan tool and compare vehicle speed
with speedometer. If reading is correct, go to step 3). If reading is
incorrect, check for speedometer malfunction. See appropriate
INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If speedometer
is okay, check for an open circuit or short to voltage or ground in
signal wiring. Repair as necessary. If wiring is okay, go to next
step.

2) Ensure ignition is off. Connect measuring unit to TCM.
Shift transmission to "N" position. Raise and support front of
vehicle. Turn ignition on. Measure voltage between measuring unit
terminals No. 20 and 48. Block one front wheel and spin other wheel
rapidly. If voltmeter reads 4-7 volts, DTC was set because of poor
terminal contact at TCM or speedometer connector. If voltmeter does
not read 4-7 volts, replace speedometer.

3) Ensure ignition is off. Check that Vehicle Speed Sensor
(VSS) is securely fastened to transmission. Ensure there is no dirt
between sensor and mating surfaces. Repair as necessary. If VSS is
okay, ensure all grounds are clean and tight. Repair as necessary.