P1744 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1744 indicates a fault in Torque Converter Clutch System Performance, typically within transmission and shift management.

Symptoms

harsh or delayed shifting
reduced acceleration
gear hunting

Common causes

Component out of calibration affecting torque converter clutch system performance
Sensor drift or delayed actuation
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1744

Confirm P1744 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to torque converter clutch system performance for obvious defects.
Compare commanded vs actual values in live data under the same operating condition.
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 P1744

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P1744?

Most vehicles can be driven short-term with P1744, but postpone heavy load/highway driving until repaired.

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 (performance) in the torque converter clutch system performance circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1744 remains cleared under the conditions that originally set the code.

Fix options

Clean/repair mechanical restriction where applicable.
Test component operation against service specs.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$300-$1500

Common mistakes when diagnosing P1744

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.

P1744 in common vehicles

P1744 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1744?

P1744 is commonly set by performance faults affecting torque converter clutch system performance.

How much does it cost to fix P1744?

For P1744, repair costs are typically $300-$1500 depending on exact root cause, labor rates, and part quality.

Can I clear P1744 without repair?

You can clear P1744 temporarily, but the code usually returns until the underlying fault is corrected.