Transmission oil pressure sensor broke - code P703

4433 Views 11 Replies 4 Participants Last post by  TransEngineer
2006 Dodge Ram 2500 Power wagon with 57,000 miles on it – I was off road hunting, when I got back to hard road the check engine light came on, It drove fine through 1st ,2nd, 3rd gear, when it hit drive it totally slipped, I pulled over and looked under it, no leaks or anything obviously wrong, started again, same fine up to drive and it slips as it goes into drive. I drove it 2 miles home in 3rd gear without any slipping. Once in my garage my error code reader gave me a P703 error, Google pointed me to the transmission sensor and I discovered the “Transmission oil Pressure sensor” had broken in half. Guessing a stick or rock caught the wire. So I removed both halves of it and went to Autozone to buy a new one. After installing the new one the truck would go forward and backward in my garage without problem but the check engine light was still on, so before trying to drive it I used my code reader to clear the error code. Now the truck will not move in any gear, Nothing at all, dropping in gear does not put load on engine or seem to engage the transmission at all. I checked the fluid not running vs. running and it does drop about 1/8 of an inch. I reset the ECM by pulling the correct fuse and turning on the key until it beeps 2 times, replacing the fuse and hoping a reset of the ECM would clear the issue. Nothing. I unhooked the battery cable overnight again hoping to reset the error condition, no help. Why would resetting the error code change the transmission problem? Is something else still need to be cleared? Hard for me to believe the transmission clutches are ruined when reverse / 1st worked one minute but not right after clearing the code. I understand the limp home mode should have been allowed me to drive it at a low speed. I understand drop in fluid pressure is why bands fail, but this doesn’t make sense. I have no error codes at this time.
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How do I get TransEngineer, someone posted he may know the answer to my problem, this is my first post and it tells me I cant PM members until I have 25 post?
It was a PO730, gear ratio incorrect displayed on the code reader, now that it has been cleared I have no codes. I did try moving transfer case from 2x to 4x and it works the same, I will get some to shift while I am looking from under it looking for any shaft movement. Thank you
I read last night on the po730 that the computer will put transmission in netrual at 18 miles per hour, that is what it seems like, it is in netrual, I did check transfer case and it is shifting ok. The part that baffles me is it moved forward and reverse with check engine light but clearing all codes caused it to not move at all. I tried unplugging the new oil pressurs sending unit expecting to get a check engine light back on, but did not? What should happen if that sensor is disconnected? I will try to rent a better scan tool to check line pressure
Today I tried to drag the truck in park, Park held the truck, put into neutral and it moved like it should, so I put it in Reverse and dragged it backwards. After doing this I started it and put it into gear and now it slid into reverse and/or Drive. The check engine light came back on with a P0700 error and a 2nd Error of P0841. I found a service bulletin 21-016-05 that seems to fit my issue. This sounds like a repair shop process, more than I would try. Once in gear the truck seems to drive ok, with check engine light on. Remember my issue started with a broken Oil pressure sensor, which I have replaced. and a P0730 error. I haven't found anyone that will come to my house with a code reader that tells me what is going on inside of the transmission, but now that it is moving again and I have a new error code(s). can I drive it to a transmission shop or might I do more damage? Should I have it towed to a shop? At this point would changing the fluid and filter have any chance of fixing it?
Thank you for your advice
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FYI resetting the error codes 15 minutes later put the truck back into a mode of not moving, just like it is in neutral. Dragging the truck in gear did nothing. I just let it idle for 15 minutes but the error code did not come back on.
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