Allison 3000 transmission locks into 4th gear
Have a 2006 Phaeton. On trip to NW in 2021 we had five events where transmission locked up in 4th gear. It produces the code 5445 (MIL). Back home in CA we took it to an Allison Transmission shop in ...
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It certainly looks like some internal part(s) have failed in the transmission. You likely needed a new transmission before this one was supposedly fixed.
