C/K - Full Size Pickup, Yukon, Tahoe, Suburban and Blazer

C/K - FULL SIZE PICKUP, YUKON, TAHOE, SUBURBAN AND BLAZER

^ Circuits 821 or 822 shorted to ground at the top of the bellhousing on one of the P style mounting clips or at one of the studs that are protruding from the cowl area (figure 4).




^ Connector C-200 not fully seated or its terminals may be damaged. C-200 is located behind the right side of the instrument panel in the area of the blower motor (figure 7).




^ Ground G-109 is corroded or loose. G-109 is located on the thermostat housing on gas engines (figure 8, Diesel application shown.)

^ Connector C-365 not fully seated or its terminals may be damaged (C-365 is connected to the vehicle speed sensor, at the sensor).

^ 4WD low input circuit 1493, which feeds pin F-8 of the PCM may be intermittently shorting to ground. This changes the PCM ratio calculation for the VSS, which can result in setting a code 72 because of the perceived rpm change in the output speed calculation for the processor.