Please Help !

I have a 99 Ram 1500 4x4 V8 5.9...

Since last night ABS light is on, truck stuck in 1st gear ...

No brake light on
No code on the OBD scanner
Rear Speed sensor on the differential brand new since this morning !

Any idea ???

 

hmm that is strange.... do you maybe have a caliper that is seized on, not letting the truck get any speed to shift? Does it feel like a brake is stuck on? Also, do you know if it is 4 wheel abs or just rear wheel?

Oh and welcome to df!

 

Thank Maxx Magnum !

4 ABS wheels ... Braking perfectly ...

I forgot, Speedo is not working either !

 

Check your rear speed sensor. That's where the speedometer feed comes from as well.

 

I already did ... I have a brand new Sensor on the differential ...

Could be the one on the tranny ???

 

I took my truck out this morning ! ABS light ON ... After 5 mins The ABS light turn off, and the truck run perfectly ...

If I turn off the engine for more than 2 mins and try to start again, the ABS light turn on and i have all these symptoms :

No Speedo
ABS light on
Truck stuck in 1st gear
Feel no power between 3000 and 4000 Rpm

After 5 mins riding... ABS light turn off, Speedo working, shifting OK, full power...

Please Help !!!

 

wow that really is weird.... if it's intermittent like that, maybe you have a short in the PCM or something, seems like it would be a computer problem to be messing up that much stuff.... Stick around, we have some realllly knowledgeable guys on here so someone surely will know something about this...

 

Thanks again Maxx Magnum !

I'm going to check all wire around the PCM ...

 

Yep, you did indeed replace the sensor in the back, but, where did you get it from? If it is still exhibiting odd behavior, that is where I would start looking....

There isn't a sensor on the trans on your truck.

 

i had a similar problem a couple weeks ago. my abs, brake AND engine lights all were on. i changed the abs sensor on the rear diff. and it didnt fix the problem. so i set out changing a few other sensors and nothing worked. i finally fixed it when i changed the rear abs sensor again. must have gotten a bad one the first time. got mine at o'reilly by the way. hope this info is helpful