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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 197 (Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0776 or P0777: Transmission Control Solenoid Valve 2 Stuck >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

The transmission control solenoid valve 2 is a high pressure, normally low, variable force solenoid. The transmission control solenoid valve 2 regulates and directs pressurized oil to the 1-2-3-4-5-Reverse regulator valve. The 1-2-3-4-5-Reverse regulator valve then directs pressurized oil to the 1-2-3-4-5-Reverse clutch assembly to apply the clutch. 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. The TCM compares the calculated gear ratio to the commanded gear ratio. The calculated and commanded gear ratios must match.

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