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Home >> GMC >> 1998 >> Yukon 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0730: Undefined Gear Ratio >> 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.

VCM calculates gear ratio based on transmission input and output shaft speed sensor readings. VCM compares known transmission ratio calibration values to calculated ratios. DTC P0730 will set if VCM detects an unknown gear ratio.

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