Slip Solenoid System
Your transmission's slip solenoid isn't working properly, which controls how much the torque converter slips to manage engine power transfer. Think of it like a clutch that's stuck or not engaging smoothly between your engine and transmission.
The ECU monitors the slip solenoid's ability to regulate torque converter clutch slip by measuring solenoid response time and hydraulic pressure feedback. It compares actual slip rates against expected values to detect electrical or mechanical failures.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Response Time | 50-150 milliseconds | >200 ms or no response |
| Converter Slip Rate | 0-2% at cruise | >5% slip unintended |
Code P1744 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1744 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.