LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1998 >> Yukon 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0756: 2-3 Shift Solenoid ("B") Performance Malfunction >> Circuit Description

Circuit Description

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The 2-3 shift solenoid (solenoid "B") is used to control fluid flow acting on 2-3 shift valve. Solenoid is a normally open exhaust valve that is used in conjunction with 1-2 shift solenoid (solenoid "A"), to allow 4 different shifting combinations. Solenoid is attached to control valve body. Ignition voltage is supplied directly to solenoid through fused circuit. VCM commands solenoid on or off through ground circuit. DTC P0756 will set if VCM detects a non-1st gear ratio while 1st gear is commanded, or a 1st gear ratio while 4th gear is commanded.

scientia non olet · About LEMON Manuals