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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 50 (Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2817 or P2818: Transmission Control Solenoid Valve 8 Stuck >> Circuit/System Description

Circuit/System Description

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

The transmission control solenoid valve 8 is a normally closed, On - Off solenoid. The transmission control solenoid valve 8 directs pressurized oil to the default valve. The transmission control module (TCM) uses information from the transmission speed sensors along with serial data information from other control modules to calculate the correct gear ratio and apply the correct clutch assemblies.

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