9/13/2023 0 Comments Allison transmission problems![]() ScannerDanner wrote: Please list the definitions of each code! Thank youĢ511- Output speed sensor, detected 0 output rpm 1st gear I measured the sensor and it is 287.7 ohms. I've checked the voltage at the ECU (13.6), looked over the wiring best I can, and pulled out the output speed sensor. I don't think it has very many miles on it since it was changed. I wish I knew why it was all changed 11 year ago. Maybe they were having the same issues before. Looking at the info plate on the transmission it is a remanufactured one and it looks like the date code is from 2008. Sorry for the long post but one other thing I forgot to mention. Has anyone had any issues like this before? Any ideas? Maybe change the fluid since it's been sitting? I'd like to rule everything out before going there. It's inside as well as the turbine speed sensor. A few of the codes have to do with the C3 pressure switch being open for one reason or another. After reading a lot of the 443 page troubleshooting guide and trying to figure out if they all have anything in common, it may be an output speed sensor, turbine speed sensor, bad wiring (wires or connectors), or a bad ECU. 7 of them came up twice, 2 of them came up 3 times and 10 of them only came up once so it's getting a bunch of different codes. I recorded the codes each of the 14 stops it took to drive back home the 10 miles. It might go 50 feet or 2 miles before the check transmission light would come on and go into neutral. I'm having to go back and unplug the ECU every time. Every time going into neutral, but just turning the ignition off isn't resetting it anymore. ![]() It seemed ok for about 10 miles and started again. I cleared them and let it sit a couple weeks before cleaning the ECU connectors again thinking that was the problem. I learned how to get the codes from the keypad shifter and wrote them down once home. Made it all the way to Memphis (400 miles without one issue). Drove it around and it seemed good, so hooked up the car trailer and tried it again. I cleaned the 3 connectors to the transmission ECU. We had to stop several times.įast forward I wanted to take it to our last big race of the year. We made it fine till about 20 miles from home. It did it several more times before it seemed to pull out of it. Checked all I knew to check and headed out in the morning. Once it got into 6th it seemed ok till we had to stop again. It never downshifted like that again, it just had the check trans light come on and it stuck in whatever gear it was in. We had to stop about 6 times before making it to a spot to stop for the night. After shutting it off and starting again it went into gear. Put it back into gear and it just stayed in neutral. ![]() It shifted hard through the gears and got to 3rd and it suddenly downshifted back to first and the check transmission light came on. On our way home about 100 miles into our 500 mile trip the transmission started acting up when we came to a stop and started to go again. It had a recent oil change and fuel filters and runs great. (Should have known then it was too good to be true although I knew it had some interior issues from a roof leak). I paid half of what one generally goes for. I picked it up in Ohio from a guy that bought it to flip. It only has 26,000 miles on it so it has been sitting for quite sometime down in Florida. I bought a 2000 Newmar Dutchstar with a Cat 350hp engine and an Allison 3000 6 speed transmission.
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