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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0751: 1-2 Shift Solenoid Valve - Performance >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The 1-2 shift solenoid valve controls the fluid flow action on the 1-2 and the 3-4 shift valves. The 1-2 shift solenoid valve is a normally-open exhaust valve that is used with the 2-3 shift solenoid to allow 4 different shifting combinations.

When the PCM detects a 2-2-3-3 gear ratio, then DTC P0751 sets. For Federal emissions vehicles, DTC P0751 is a type "C" DTC. For California emissions vehicles, DTC P0751 is a type "B" DTC.

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