Join Date: Sep 2008
Location: Fruitland Park,Florida
Hook car up to an obd2 scanner that will show running sensor data. look up the speed reading on the sensor list. See how it compares to what the speedometer is reading.
If pcm speed reading and speedometer speed reading are the same, your problem lies with the vss, or the wiring to the pcm.
If pcm speed reading is correct and speedometer speed reading is messing up, then problem lies with speedometer itself, or wiring from pcm.