Code Definition

P1723 — Gear 3 incorrect Ratio

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Generic

About P1723

P1723 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1723 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Transmission Control Module (TCM) continuously compares the input speed sensor (ISS) and output speed sensor (OSS) signals to calculate the actual gear ratio and confirm the transmission is in the commanded gear. DTC P1723 sets when the calculated ratio in third gear does not match the ratio programmed for third gear, indicating the transmission is not delivering the correct third gear reduction. This usually means power is slipping through the third gear elements, or that a speed sensor is reporting an incorrect shaft speed. The driver may notice slipping, flared or harsh shifts, higher t...

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