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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (AUTOMATIC TRANSMISSION - ALLISON - DIAGNOSTICS (DTCs P0732-P0877)) >> DTC P0777 >> Circuit Description

Circuit Description

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Pressure control solenoid 2 (PCS2) is used to control on-coming, off-going, and holding pressure to any 1 of the 5 clutches. This solenoid is referred to as a pressure proportional to current (PPC) solenoid since the output hydraulic pressure supplied by this solenoid is proportional to the controlled current command.

The transmission control module (TCM) uses information from the turbine and output speed sensors (OSS) to detect if a clutch is in a tie-up condition or 3 clutches are applied. The clutch being controlled by PCS2 will vary, depending on the shift being made.

DTC P0777 is a type A DTC.

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