VSS (Vehicle Speed Sensor)
The other day I started driving my 2004 GXP and the shifts were very hard. It would not shift from 1st to 2nd until about 30 mph. From 2nd to 3rd it was the same and so on. I also noticed the speedometer wouldn't move till about 25 mph either. I immediately suspected loss of ATF. I looked under the car and no leak was found. Checked the level on the dipstick and that looked fine as well (although it needed changing bad). I then drove it around again and everything was back to normal. Hmmmm What was wrong? The car only has 50,700 miles.
I thought maybe the fluid was dirty and something was getting clogged somewhere so I did a transmission flush at a local garage. I left there and all seemed fine till later in the day. Went back to the garage and they did a diagnostic check and it said Low Voltage from the VSS (Vehicle Speed Sensor). I went and bought a new speed sensor for about $25 and will have it installed Monday. Has anyone else experienced this phenomenon? Also, after replacing the transmission fluid, I was shocked to see how dirty mine was. Some of you may want to check the condition of your fluid. My level was fine but it was dirty as all get out. Anyone knows what could cause premature dirtying of the ATF?