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Home >> GMC >> 2007 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P0961) >> DTC P0788 >> Circuit Description

Circuit Description

WARNING: This page is about a different variant/trim than selected.

The 3-2 shift solenoid (SS) valve is a normally-closed, 3-port, ON/OFF device that controls the 3-2 downshift. The solenoid attaches to the control valve body within the transmission. The solenoid receives voltage through the ignition voltage circuit. The transmission control module (TCM) controls the solenoid by providing a ground path on the 3-2 shift solenoid valve control circuit. During a 3-2 downshift, the 2-4 band applies as the 3-4 clutch releases. The TCM varies the timing between the 3-4 clutch release and the 2-4 band apply depending on the vehicle speed and throttle position.

When the TCM detects a continuous short to voltage in the 3-2 shift solenoid valve control circuit, then DTC P0788 sets. DTC P0788 is a type A DTC.

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