P1743 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1743 indicates a fault in Torque Converter Clutch Solenoid Failied On, typically within transmission and shift management.

Symptoms

harsh or delayed shifting
reduced acceleration
gear hunting

Common causes

Electrical fault in the affected circuit affecting torque converter clutch solenoid failied on
Control module logic or calibration issue
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1743

Confirm P1743 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to torque converter clutch solenoid failied on for obvious defects.
Use freeze-frame and live data to isolate whether the issue is electrical, mechanical, or control logic.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1743

Low: This code is low to moderate severity in most cases, but diagnosis is still recommended to avoid recurring warnings.

Can you drive with P1743?

The vehicle is often drivable with P1743, but plan a repair window to prevent repeat faults.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (generic) in the torque converter clutch solenoid failied on circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1743 remains cleared under the conditions that originally set the code.

Fix options

Test component operation and replace if faulty.
Inspect circuit and connector condition.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$180-$650

Common mistakes when diagnosing P1743

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P1743 in common vehicles

P1743 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1743?

P1743 is commonly set by generic faults affecting torque converter clutch solenoid failied on.

How much does it cost to fix P1743?

For P1743, repair costs are typically $180-$650 depending on exact root cause, labor rates, and part quality.

Can I clear P1743 without repair?

You can clear P1743 temporarily, but the code usually returns until the underlying fault is corrected.