Allison LCT1000 No Move Condition – TCB13

Technical Bulletin # TCB13
Transmission: Allison LCT1000
Subject: No Move Condition
Application: GM
Issue Date: July, 2011

No Move Condition

A GM truck equipped with an Allison LCT1000 and a complaint of a no move condition. The PRNDL indicator on the dash flashes when the shift selector is placed into gear. There are no codes present and scan data on the GM Tech II (figure 1) reads normal.

This symptom may be caused by a restricted solenoid feed filter located in the “shift” valve body (figure 2). Do not mistake this problem for a bad converter. Always remove and checkthe filter during inspection.

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July 2011