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The TCM will not allow the transmission to shift past third gear. The bus gets locked in third. We took the TCM from the sister bus to this one and the transmission shifted perfectly. So this one needs to get checked why it is not allowing the transmission to shift past third gear.
Topic starter
Posted : 04/07/2025 9:03 pm
Thank you for contacting UpFix. We should be able to fix those issues:
https://www.upfix.com/product/blue-bird-bus-2007-2015-allison-a50-t14-duramax-gm-tcm-transmission-control-module-repair/
Posted : 04/07/2025 9:04 pm