ABS and Brake Light On; Code P0700 and P1794; 2003 Dodge Ram 2500 5.7L

This is my first time posting to this forum.

For a few months the ABS and Brake Lights on the dash were on, and while I was waiting for my service person to come back to work I started having problems with a power loss in the engine. The truck would lose power, but not shut down completely; and if I turned the key off and then back on, the engine would run for a while before doing it again. I checked for a code, and there were not codes, just the "lightning bolt" lighting up when the engine lost power.

I replaced the MAP sensor just to be safe, but this did nothing. I found a video no youtube where someone else had the same exact problem, which they resolved by replacing the throttle assembly. I bought & installed a new throttle assembly from the dealer and all was well for about three weeks, and then I started having the same problem again. Although some forums said the computer needed to be flashed after the throttle assembly replacement, I checked with the dealer and they said it was not necessary. I did not flash the computer, but did do a hard reset.

While I was still waiting to get the truck in the shop for the ABS and Brake Lights, I ran another code search and found codes P0700 - Transmission Control System MIL Request and P1794 - Speed Sensor Ground Error. In searching youtube I found two people who fixed the P0700 error code with a speed sensor replacement, so I went to the dealer and replaced my speed sensor as well. Unfortunately, this did not change anything and I still have the P0700 and P1794 codes....and when I was driving on the highway today, the truck lost power three more times.

Before I bite the bullet and take this to the dealer (rather than my local repair shop) does anyone have any idea what I can do to fix these problems? Any help would be appreciated.


Thanks.

 

I had the same situation, tried the same things, and like yourself - nothing seemed to make a difference. On a fluke I started playing with the fuse box and focused on those fuses in-line with the ABS and brake lights on the dash. One fuse was the culprit. The tension of the fuse box clamps was weak. The fuse was only making contact intermittently. I pulled the fuse, turned it over and pushed it back in. Cleared up my problems until the first rough road. I took the fuse and using a solder gun, thickly tinned each side of both legs on the fuse. By increasing the thickness of the fuse legs I increased pressure on the connection and cured my problem of blinking dash lights. Power loss was another loose fuse in a friends 3500. The guy installing an air compressor simply wrapped the wire around a fuse leg and jammed it into the fuse box. That sprung the fuse retaining clips and caused the same problems you have described. Perhaps a loose wire or ground would create the same problem but my 2500 and my friends 3500 were loose fuses..............