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Home >> Volvo >> 2021 >> XC40 T4 R-Design >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Transmission - Design >> Transmission Control Module >> Transmission Control Module (TCM) (4/28) [2019-2022, TG-81SC | 2018-2022, TG-81SC AWD] >> Diagnostic Information
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Diagnostic Information

The Transmission Control Module (TCM) has a built-in diagnostic system, which continuously monitors itself and the input and output signals.

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