FYI on Allison trouble Code P0847
After a 1700 mile trip, pulled into the driveway and saw a check engine banner on the dash. Checked the code using the touch pad, it showed everything was in good health but showed an active P0847 code. Freightliner stated it was a pressure switch inside the transmission.
Allison found that the pressure sensor was stuck and needed to be replaced. $1700.00, all covered by warranty Allison, and ten days later, all is good again.
Just wanted to post for anyone who has the same code pop up. It's a 4000m in a Freightliner with the 450Isl only 8500 miles old.
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