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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 220 (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 2003 Buick Regal and 2003 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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