Powertrain, generic · Transmission

P0741 Torque Converter Clutch Circuit Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0741 means the converter clutch does not lock although commanded – slip stays too high while the circuit is electrically fine. Thresholds: GM's T43 at least 130 rpm for 5 s twice, the 6T70 50 rpm for 5 s three times, Saab's Aisin AF40 over 100 rpm for 2 s, all after two trips; Ford over 100–200 rpm or a speed ratio below 0.93 over five lock-up events; Subaru engine speed more than 9/8 of target for 10.2 s. The module then locks out the clutch, sometimes the top gear, and uses a hot-mode shift pattern. Low or burnt fluid, a worn control valve in the valve body and a glazed converter clutch are the usual causes; Hyundai's 8-speed bulletin calls for a new converter.

Likely causes

Fluid level too low, old or burnt fluid
Converter clutch control valve worn or sticking, bore worn
Lock-up clutch in the converter worn or glazed
Solenoid mechanically sluggish (electrically fine)
Leaking turbine shaft seals or pump

Symptoms

  • Check engine light or transmission warning
  • Higher engine speed when cruising, 'rubber band' feel
  • Higher consumption, rising fluid temperature
  • Possibly shudder when the clutch applies

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–3,000
Time1–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Check fluid
  2. Check solenoid operation
  3. Compare engine and turbine speed

Parts involved

torque converter clutch solenoidtorque convertertransmission valve bodytransmission control module

Related codes

P0740P0742P0743P2758P2763P0711

References: gsi.ext.gm.com, saabwisonline.com, saabwisonline.com, saabwisonline.com.