I have a 2003 RAM 3500 with a Cummins 5, 9 ltr diesel engine and automatic transmission. The problem is that its changing gear uncontrolled between 3rd, 4th and OD. When I try the cruise control, it turn it self off after just a few seconds. The problem came after I drove into a pretty big bump in the road. It became worse gradually. Could it be an electrical problem? I went to a local garage and changed oil, filters and some electrical sensors/switches in the transmission. It didn`t get any better : -(
Looking forward to your reply.
Per Olav Maridal
Hi I wouldn't rule out an electrical problem but it may take a transmission shop to actually pinpoint, where it is. The fact that the cruise has a prob also leads me to believe you actually have either a speed sensor or wheel sensor. These sensors have a lot of probs in the winter due to ice and wheel slippage.
Do you have a abs light on or traction these normally will accompany most speed sensor failures.
February, 25, 2011 AT 10:16 PM
The speed sensor has been replaced (if its in the transmission box).
Is there only one wheel sensor. Or is it one on each wheel? Could it be caused by a brake problem. Once, some months ago, I forgot the hanbrake on and the brakedisc left, back was glowing red. No imediate problem after that.
February, 26, 2011 AT 8:32 PM
Yes there is a sensor on each wheel depending on rather you have 4 wheel abs or a system called rabs which is only rear wheel abs. The heat from a overheated brake rotor could most definately cause a sensor in that wheel to fail. I would take a good look at that sensor on the overheated brake occurred. Although these are independant systems the heat is in the same place as the sensor.