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Home >> Volvo >> 2021 >> V90 T6 R-Design >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Transmission - Design >> (Transmission Control Module) >> Transmission Control Module (TCM) (4/28) [2018-2021, TG-81SC] >> Diagnostic Information
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Diagnostic Information

The Transmission Control Module (TCM) ensures optimal gearshift timing and lock-up engagement by processing signals from a number of sensors in the transmission and in the engine management system.

The gear position sensor does not have a built-in diagnostic system. The Transmission Control Module (TCM) monitors the sensor, sets DTCs and stores readable parameters.