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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0977) >> DTC P0872 or P0873 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Cadillac Escalade EXT, 2007 Cadillac Escalade ESV, and 2007 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

The transmission fluid pressure (TFP) switch 3 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM supplies 12 volts to the TFP switch 3 on the TFP switch 3 signal circuit; the TFP switch 3 has an internal case ground. TFP switch 3 is normally closed, Low. When oil pressure is present at the TFP switch 3, the switch is Open, High. The normally low clutch pressure control (PC) solenoid 4 controls the transmission fluid to the 2-6 clutch. The TCM monitors the normally closed TFP switch 3 signal circuit to determine the 2-6 clutch status.

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