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 Allison high temp tranny problem
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469 Posts

Posted - 02/28/2013 :  3:59:30 PM  Show Profile  Reply with Quote
I have an Allison 2500 behind a CAT C7 in a 06 FS-65 with 70K thatís giving me issues. Bus wouldnít shift into reverse and temp went up to 275. It had a stored code for a pressure solenoid stuck off. Once it cooled down it was shifting forward and reverse. Checked fluid, fluid was a little low and discolored, so we drained and refilled with fresh fluid and changed the red filter. The filter magnet had an alarming amount of metal particles on it. Cleaned it all up and went on a test drive, bus was shifting ok but still not great. Dropped pan, replaced internal filter, cleaned out some more metal flecks, changed the external filter again and refilled tranny. Shifting is much smoother now and no codes, but a few issues still remain. When shifting from N to D the rpms drop and idles rough, take your foot off the brake and bus starts to take off on its own (even up hill). Sit in traffic and the trans temp rises, sit for too long and it goes up to 275, but once the bus is back in motion it drops back down. So, what lies ahead for this bus? Are there other things I should be looking for/testing to troubleshoot my problem. Iím in New England and the daytime temps have been in the 30-40ís and the bus is now running without a winterfront and my water temp is where it should be, so why is my trans temp climbing so high? Iíve got several 03-05's with the same AT with higher mileage and theyíve been trouble free so this one is puzzling me. Any ideas?

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788 Posts

Posted - 02/28/2013 :  4:39:57 PM  Show Profile  Reply with Quote
Buster, Do you remember the codes? Did you have a P0960? There's an issue with the internal harness in the 1000 and 2000 series that will set off a pressure control solenoid code. I've seen it in 3 of my 2008 CE's. For some reason I can't get it to link. If you have a decent Allison rep, have him send you SIL# 24-1k2k-09. Otherwise I can scan it and send it to your e-mail.
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