Torque Converter Clutch Circuit Intermittent
Your transmission's torque converter clutch is intermittently losing electrical connection or hydraulic pressure, like a light switch that flickers on and off. This prevents the engine and transmission from locking together smoothly, reducing efficiency.
The ECM monitors solenoid current draw and pressure feedback from the torque converter clutch circuit. When voltage or hydraulic pressure drops below threshold intermittently, the ECU logs this fault. The solenoid should toggle smoothly between on/off states at specific RPM and load conditions.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Current | 0.5-2.5 amps when commanded | Fluctuating or falling below 0.3 amps |
| Clutch Slip Speed | 0-100 RPM differential | Intermittent spikes above 200 RPM |
Code P0745 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, P0745 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.