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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0758: 2-3 Shift Solenoid Electrical Problem >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The 2-3 shift solenoid valve controls transmission fluid pressure acting on the 1-2 and 2-3 shift valves to position the valves for the appropriate gear. The 2-3 shift solenoid valve is a normally-open exhaust valve located on the control valve body. A fused circuit supplies ignition voltage to the 2-3 shift solenoid valve. The PCM commands the solenoid on or off by switching the ground path. When the 2-3 shift solenoid valve is commanded on, the PCM senses low voltage. When the 2-3 shift solenoid valve is commanded off, the PCM senses high voltage.

If the PCM detects a continuous open, short to ground or short to power in the 2-3 shift solenoid valve circuit, then DTC P0758 sets. DTC P0758 is a type "A" DTC.

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