I have a 2005 Ram 4x4 with the 2 wheel TRW ABS module. I have the flashing yellow ABS light until I drive a short distance, then yellow ABS and red Brake lights come on solid. The truck has popped up these codes at different times I have checked it:

• Code 37 for intermittent signal from the rear speed sensor
• Code 83 for tire revs per mile out of range (I adjust for the tire size with a DRBIII years ago and think this is residual from that

I have replaced the rear speed sensor with no change to the codes, as well as doing a wire continuity check from the speed sensor to the ABS module. This leave the ABS module as the culprit. I purchased a used TRW ABS module, but it is giving me the same errors. I am guessing my next step is programming that module, but am wondering if there are any affordable tools I can download or buy for my laptop to program that module? I see lots of options for the 06+ Rams, but not for the 05 and older. Any help would be appreciated.

 

So I rented a DRBIII and went though the "MISCELLANEOUS" option of the ABS section and updated my revs per mile to correct my speedometer. When I restarted the truck I no longer had the flashing yellow ABS light, but after driving down the road a short distance both the BRAKE and ABS lights come on solid. I am still getting a code 37 for the rear axle sensor. I had previously replaced the sensor with no affect on the code 37. I am now wondering if I may have crud built up in the axle near that may prevent the sensor from picking up every pass from the ABS tone ring. I also have an issue with cruise control where the truck acts like it is hunting for the speed instead of maintaining. Has anyone ran across issues like this and a code 37?

 

Another update: I pulled the rear diff cover and found that the previous owner must have broken the speed sensor off in the housing where it damaged the ABS tone ring teeth. I will be replacing the ABS tone ring if anyone has one. Just closing the loop on this so anyone searching has useful info.