Allison 1000 & 2000 Gen 4 Fault Codes: P0563 System Voltage High CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) requires a...

Allison 1000 & 2000 Gen 4 Fault Codes: P0602 TCM Not Programmed CIRCUIT DESCRIPTION:At the power up and after clearing...

Allison 1000 & 2000 Gen 4 Fault Codes: P0606 Controller Internal Performance – Not Enabled for Pickups or Med Duty...

Allison 1000 & 2000 Gen 4 Fault Codes: P0614 Torque Control Data Mismatch – ECM/TCM CIRCUIT DESCRIPTION:Shift Energy Management (SEM)...

Allison 1000 & 2000 Gen 4 Fault Codes: P0701 Transmission Control System Performance CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) monitors...

Allison 1000 & 2000 Gen 4 Fault Codes: P0703 Brake Switch Circuit Malfunction – GMT 800 Only CIRCUIT DESCRIPTION:A mechanical...