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Home >> GMC >> 2003 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 457 (Automatic Transmission - 4L80-E/4L85-E Diagnosis (DTC P0218 To DTC P2771)) >> Diagnosis >> DTC P0730 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 GMC Yukon XL, 2004 Chevrolet Suburban, and 2004 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The powertrain control module (PCM) calculates the gear ratio based on the automatic transmission input shaft speed sensor (AT ISS) and output shaft speed sensor (AT OSS) readings. The PCM compares the known transmission gear ratio to the calculated ratio for the selected gear ranges. Refer to Range Reference .

If the PCM detects an incorrect transmission gear ratio, DTC P0730 sets. DTC P0730 is a type C DTC.

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