allison code 2511

Hello experts. I've got an Allison 3060 w/ pto and she won't shift past 1st. I've got a code 2511. Does this refer to a speed sensor? I noticed a broken off wire on the underside of the trani on a hydraulic line (only one I see). Could this be causing the error or is there something more serious going on. Appreciate your comments and thanx in advance.

allison code 2511

Yes, 25-11 is an output speed sensor fault. Make sure fluid level is OK and check wiring and connections at sensor and ECU. Could also be short in wiring harness. Good Luck
allison code 2511

There has also been a problem with tone wheel wear. You can check it easily by removing the output speed sensor. Using a scribe or a small scredriver see if the tone wheel moves back and forth freely.