I told Twogun I was going to try and assist him in fixing his problem:
For over a year I have been dealing with my trans. going into limp mode. When it happens it won't shift below 3rd on it's own and will only go to 2nd manually, not 1st. I have changed out both the Gov solenoid and the pressure sensor in the valve body to no avail. Dave Goerend had me install a resistor in a wire from the PCM to the trans and it did not work either. All of the repairs worked for a week or two but the problem always came back. Dave Goerend suggested a reflash of my computor but the dealer says I have the latest flash in my 02. Anyone have any ideas? Also what would a dealer charge for a reflash? Twogun
This is extremely common
in the 47RE and 46RE (44re and 42re could be as well). And
it can be a number of things causing this as well! Gov solenoid, gov pressure transducer (sensor), PCM, wires from the PCM to the V/B(Valve Body), internal V/B and line pressure set too high. There can be other factors that cause this as well, but these show up like clock work. There are ways to trouble shoot these
, but being we are on the Cummins Forum we like to skip over the trouble shooting thing often. (not a good thing)
Being Twogun already went over gov transducer, gov solenoid, and PCM. That leaves only internal valve body issues, wires to the PCM to VB
, or line pressure cranked wrong. Line Pressure being set too high is the most likely scenario in this case.
The gov pressure solenoid receives line pressure and what comes out is the gov pressure
. So when line pressure is set too high, gov pressure follows. (Governor pressure is suppose to read around 1PSI for every 1MPH.) The solution: Reduce line pressure.
To adjust you take a 3/16 allen wrench and grind it down so you can adjust line pressure without removing the valvebody. Clockwise to reduce pressure. (Counter-Clockwise to increase pressure) Every turn knocks it down around 1.5-2 PSI
On the right side of the filter is the governor body. The round thing, protected by the U shaped plate is the solenoid and the sensor behind that with the 3 wires is the transducer.
Often times these sensors get replaced with aftermarket sensors to allow higher line pressures and/or resister(s) get put in wire(s). BTW the pictures are from a 46RE for those wondering about the exhaust pipes.
I take no responsibility for any damage done.