Circuit Description
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The transmission control module (TCM) provides voltage to shift solenoid 1, 2, and 3 (SS1, SS2, and SS3) and pressure control solenoid 2 (PCS2) through a separate solid-state device called high side driver 2 (HSD2). HSD2 is continuously ON during normal operation, except during a brief circuit test. The TCM regulates control current to the solenoids by switching the appropriate low side driver ON and OFF.
DTC P2671 is a type A DTC.