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Home >> Cadillac >> 2017 >> CTS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P171D: Transmission Fluid Pressure Accumulator System >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The transmission control module (TCM) monitors the input speed sensor for excessive input shaft speed during an autostart event. The DTC will set if there is excessive input shaft speed indicating the accumulator system is not capable of supplying the necessary fluid pressure, to the clutches during autostart.

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