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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 P2718, P2720 or P2721: Transmission Control Solenoid Valve 4 Control Circuit >> 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 solenoid valve 4 is a high pressure, normally high, variable force solenoid valve. The transmission control module (TCM) high side driver 1, supplies 12 V to the transmission control solenoid valve 4. A low side driver circuit in the TCM is pulsed width modulated to vary the current to the solenoid. If excessive current flow is detected, the high side driver 1 will turn Off. When the circuit fault is corrected, the high side driver 1 will reset.

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