This instruction show you guide on how to repair Allison 3000 & 4000 Gen5 Torque Converter Clutch (TCC) system stuck off P0741 error.
Related Contents:
Allison DOC GEN5 Diagnostic Software 2025
NEXIQ USB Link 3 Diagnostic Tool
DIAGNOSTIC RESPONSE:
None
CIRCUIT DESCRIPTION:
This test detects if there is excessive lockup slip speed while TCC lockup commanded.
ACTION TAKEN WHEN THE DTC SETS:
1 DTC is stored in TCM history.
2 The CHECK TRANS light illuminates.
3 TCC (lockup clutch) commanded off.
CONDITIONS FOR CLEARING THE DTC/CHECK TRANS LIGHT:
Use the diagnostic tool to clear the DTC from the TCM history.
The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without the DTC recurring
DIAGNOSTIC AIDS:
DTC P0741 maybe caused by:
1 Turbine shaft speed sensor signal circuit issues.
2 Low TCC pressure and/or main press
3 Control module is sues like stuck/sticky valves mechanically defective TCC solenoid broken springs,damaged valve bores plugged suction filter,damaged gaskets,excessive leaks to exhaust etc.
4 Transmission issues such as worn and/or damaged seals or seal rings,worn TCC damper,mechanical TCC issues,rotating drum damage (affecting turbine shaft speed pickup),debris,excessive hydraulic circuit leaks to exhaust or other hydraulic circuits.
5 Issue with TCM.
