Transmission

P0741Torque converter clutch stuck off

Torque Converter Clutch Circuit Performance/Stuck Off

Get it diagnosed soon

Generic OBD-II code

Torque Converter Clutch (TCC) Solenoid

What this part does

Locks the torque converter to provide a direct mechanical connection between engine and transmission, improving efficiency at cruise.

What the computer is measuring

A torque converter connects the engine to the transmission through fluid rather than metal. That is what lets the engine idle while the car sits still. The cost of it is slip, and at a steady cruise that slip is pure waste turned into heat.

So the converter contains a clutch that locks its two halves together once the car is up to speed and the load is steady. Locked, the connection is mechanical, engine speed drops slightly for the same road speed, and both economy and transmission temperature improve.

The computer knows engine speed and it knows transmission input speed. The difference between them is slip, and it can measure it continuously. When it commands the clutch on, it expects slip to fall close to zero within a defined time.

P0741 means it commanded lock up and the slip stayed. That is the stuck off half of the code name, and it is a performance measurement rather than a circuit test.

How this differs from P0740

The two codes overlap enough to be confusing. P0740 is the broader one and often covers the electrical circuit as well as the performance. P0741 is specifically about the result. The command was issued, the electrical side may well be perfect, and the mechanical outcome did not follow.

That matters for what to check. This code puts hydraulics, fluid condition and the converter itself near the front of the list, and it puts wiring nearer the back. A solenoid that measures correctly on a meter can still be stuck, and this is the code that catches that.

Check the cheap inhibitors before condemning the transmission

Two things stop lock up deliberately, and both are outside the transmission. Most vehicles will not lock up until the engine has reached normal operating temperature, so a thermostat stuck open can produce this code every winter with a healthy transmission underneath. Many will also not lock up while the brake pedal signal is active, so a misadjusted or failing brake light switch does the same thing all year round.

Both are inexpensive, both are quick to check, and both are missed regularly on the way to an expensive conclusion.

What a generic adapter can and cannot see here

P0741 is in the generic powertrain range, so a generic OBD-II adapter will read the code. What it will generally not read is live transmission data such as line pressure, individual solenoid commands or transmission fluid temperature, or the manufacturer specific transmission codes that often accompany it. That data sits outside the generic OBD-II set and needs make specific equipment.

What you will notice

  • Higher engine speed than usual at a steady motorway cruise, for the same road speed.
  • Fuel economy noticeably down on longer journeys while town driving feels normal.
  • Transmission running hotter than it used to, sometimes with a temperature warning on a long climb.
  • No obvious change at all in some cases, beyond the light.

Likely causes, most common first

Ordered by how often each one actually turns out to be the problem, not alphabetically and not by part price.

  1. Low or degraded transmission fluid

    The first thing to check and behind a large share of these codes. Lock up is applied hydraulically, and a diagnosis made on burnt or low fluid is not worth much anyway.

  2. A failed torque converter clutch solenoid

    Electrically it may still measure correctly while sticking hydraulically. Commanding it with a scan tool and watching for a change in slip is a better test than resistance alone.

  3. A worn clutch lining inside the torque converter

    The clutch applies but cannot hold, so slip never falls to zero. Usually gradual, and often preceded by a period of shuddering.

  4. Valve body wear or a stuck regulator valve

    The apply pressure never reaches the converter even though the solenoid is doing its job. Common on high mileage units and on transmissions that have run hot.

  5. A faulty input or output speed sensor

    The computer works out slip by comparing two speeds. A wrong speed reading produces a slip figure that was never real, and the transmission is fine.

  6. Another condition inhibiting lock up on purpose

    Most transmissions will not lock up until the engine reaches normal temperature, and many will not while the brake switch says the pedal is down. A thermostat code or a faulty brake switch produces this code with a healthy transmission.

What to check, in order

  1. Check the transmission fluid level and condition before anything else.

    Low or burnt fluid has to be dealt with first, because every measurement below it is taken on a system that is not being fed properly.

  2. Watch commanded lock up alongside engine speed and transmission input speed at a steady cruise.

    Slip that persists after the command goes on confirms the clutch is not holding. Slip that disappears normally means the clutch is applying and the code is coming from the monitoring rather than the mechanism.

  3. Check whether the engine reaches its normal operating temperature, and whether a coolant thermostat code is stored.

    An engine that never warms up properly will never be allowed to lock up, and the fix is the thermostat rather than anything in the transmission.

  4. Check the brake light switch.

    A switch that reports the pedal is pressed when it is not inhibits lock up permanently. Brake lights that stay on faintly, or a cruise control that will not engage, are the usual giveaways.

  5. Measure the solenoid circuit and command the solenoid with a scan tool.

    An out of specification coil confirms the solenoid. A good circuit with no change in slip when commanded puts the fault into the hydraulics or the converter itself.

Where this one turns up most

  • Higher mileage automatics well past their fluid service interval, particularly ones used for towing.
  • Vehicles doing mainly short journeys, where the transmission fluid rarely reaches its working temperature.

Codes that often show up alongside it

What a DriveDecode adapter can read

A DriveDecode adapter reads engine and emissions systems: the powertrain and emissions codes the OBD-II standard requires on every US vehicle it covers. It does not read ABS, airbag (SRS), TPMS or transmission-specific manufacturer codes. Those need make-specific decoding that generic OBD-II hardware cannot do.

Reading P0741 on your own car

DriveDecode pulls P0741 straight off the vehicle along with the freeze frame the computer stored when it set: the coolant temperature, engine load and speed at that exact moment. That context is what separates a fault that happens on a cold start from one that happens under load, and it is the first thing the list above asks you to narrow down.

See how DriveDecode works

Last reviewed 2026-09-08. Definition sourced from the published standard.