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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 P27A7-P27AD: Transmission Control Solenoid Valve 1-7 >> 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 solenoids in this transmission require unique electrical current vs. oil pressure performance matching data values in order to function at maximum performance and efficiency. This data is programmed and stored in the vehicle's transmission control module (TCM). When a transmission assembly, transmission control solenoids, or TCM is replaced, the TCM must be programmed with the new or existing solenoid performance data.

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