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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 33 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0878-P2723)) >> DTC P0960 >> Circuit Description

Circuit Description

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The pressure control solenoid main modulation (MAIN MOD) is a normally closed (N/C) solenoid used to modulate transmission main pressure. The transmission control module (TCM) commands the solenoid ON when specific transmission and engine conditions are met. When solenoid MAIN MOD is commanded ON, hydraulic pressure is routed to the main pressure regulator valve, lowering transmission main pressure.

The TCM provides voltage to the MAIN MOD, torque converter clutch (TCC) and pressure control solenoid 1 (PCS1) through a separate solid-state device called high side driver 1 (HSD1). The TCM uses a low side driver to switch MAIN MOD ON and OFF.

DTC P0960 is a type A DTC.

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