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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 834 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> DTC P0730: Incorrect Transmission Gear Ratio >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 GMC Yukon XL, 2003 Chevrolet Suburban, and 2003 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, See Range Reference  .

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

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