P0741 explained: possible torque converter lock-up symptoms and ATF, pressure and TCC checks before replacing transmission components.
Meaning, symptoms, causes and checks
P0741 indicates a performance problem or failure to apply the torque converter lock-up clutch, known as the TCC. Lock-up reduces converter slip when commanded by the transmission. The code does not automatically mean the entire transmission has failed. Diagnosis distinguishes pressure loss, component wear and a control or software condition using the procedure for the exact transmission.
Affected system: Powertrain
Symptoms
- Check-engine light; some vehicles may display a transmission warning.
- Engine speed may remain higher when converter lock-up is requested; symptoms vary by transmission.
Possible causes
- Internal pressure leakage or a problem in the hydraulic circuit that applies the TCC.
- Wear of clutch friction material or internal transmission components.
- A TCU calibration condition, only where a bulletin applies to the exact configuration.
What to check
- Preserve codes and occurrence data; identify the exact transmission.
- Check ATF level and condition using the manufacturer procedure and specified fluid-temperature conditions.
- Compare TCC command with available slip and speed data under the prescribed test conditions.
- Where required, check pressure and the hydraulic circuit before selecting a replacement part.
- Match bulletins to VIN and calibration. The Honda, GM and Kia examples have different remedies and are not interchangeable.
- Avoid forcing a road test with severe slipping or overheating; verify TCC operation after repair.
Also written as: P0741-00, P074100, PO741 (some scan tools add the fault-type byte, e.g. -00).