Low or degraded automatic transmission fluid (ATF) level or condition; Faulty or contaminated transmission fluid pressure sensor or solenoid pack; Sticking or worn third gear shift solenoid or valve body components; Internal transmission wear, such as a slipping third gear clutch pack or band; Damaged or corroded wiring or connectors between the TCM and transmission sensors/solenoids; A faulty transmission range sensor or output shaft speed sensor providing incorrect signals; TCM software calibration issues or a faulty TCM (less common)

DTC codes / Ford codes / P1723

P1723 · FordGear 3 Incorrect Ratio

Q: What does code P1723 mean?

Gear 3 Incorrect Ratio. P1723 on Ford vehicles means the transmission control module (TCM) has calculated that the actual gear ratio in third gear does not match the ratio it expects for that gear. The TCM monitors input shaft speed versus output shaft speed and flags the code when the calculated ratio falls outside the programmed tolerance for third gear.

P1723 on Ford vehicles means the transmission control module (TCM) has calculated that the actual gear ratio in third gear does not match the ratio it expects for that gear. The TCM monitors input shaft speed versus output shaft speed and flags the code when the calculated ratio falls outside the programmed tolerance for third gear.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

Symptoms you may notice

Illuminated check engine light or transmission warning light, often with no other symptoms
Harsh or delayed shifts, especially when the transmission tries to engage third gear
Transmission may slip or flare during the 2-3 shift or while cruising in third gear
The TCM may command a limp-home mode, holding the transmission in a single gear
Poor fuel economy or unusual engine RPM at highway speeds if third gear is not engaging properly
In some cases, no drivability symptoms besides the warning light

Common causes, most likely first

Low or degraded automatic transmission fluid (ATF) level or condition
Faulty or contaminated transmission fluid pressure sensor or solenoid pack
Sticking or worn third gear shift solenoid or valve body components
Internal transmission wear, such as a slipping third gear clutch pack or band
Damaged or corroded wiring or connectors between the TCM and transmission sensors/solenoids
A faulty transmission range sensor or output shaft speed sensor providing incorrect signals
TCM software calibration issues or a faulty TCM (less common)

How to diagnose and fix it

Check transmission fluid level and condition; top off or replace fluid if degraded
Perform a visual inspection of transmission wiring and connectors for damage or corrosion
Use a scan tool to read live data for input and output shaft speeds and compare calculated ratio in third gear
Test the third gear shift solenoid and pressure control solenoid for resistance and function
Inspect the valve body for sticking valves or debris, and clean or replace as needed
Perform a transmission pressure test to check for internal leaks or weak pump pressure
If internal wear is confirmed, remove and rebuild or replace the transmission

What Ford technicians check before replacing a transmission

A low fluid level or a clogged transmission filter can cause ratio errors without any internal damage, so always verify fluid condition first.
The code can be set by a faulty output shaft speed sensor even when the transmission is mechanically sound, so live data comparison is critical.
On some Ford models, a software update for the TCM can resolve false ratio errors, so check for technical service bulletins before major repairs.
Wiring harness chafing near the transmission connector is a common hidden cause that mimics internal transmission failure.
A sticking third gear solenoid may only act up when the transmission is hot, so road test with a scan tool recording data to catch intermittent faults.

Can I keep driving with P1723?

You can drive the vehicle cautiously to a repair shop, but avoid heavy acceleration or towing, and do not continue driving if the transmission slips severely or enters limp mode, as this can cause further internal damage.

Tools that help

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Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.