Nissan Error P0744: Torque Converter Lockup Clutch Malfunction

Error P0744 on cars Nissan is one of the most common problems associated with automatic transmissions. This code indicates a malfunction in the control circuit Torque Converter Lockup Clutch (TCC), which is responsible for the rigid connection between the engine and transmission at high speeds. If you ignore the problem, it can lead to serious automatic transmission damage, increased fuel consumption and even loss of traction.

Owners Nissan Qashqai, X-Trail, Juke and other models with an automatic transmission often encounter this error after 100–150 thousand kilometers. In some cases, a worn solenoid is to blame; in others, contaminated oil or wiring problems are to blame. In this article we will analyze exact causes of P0744 for specific Nissan models, diagnostic methods (including scanners and manual tests) and step-by-step repair instructions - from changing the oil to flashing the control unit.

What does error P0744 mean on Nissan?

Code P0744 stands for "Torque Converter Clutch Circuit Intermittent" — intermittent malfunction in the torque converter lock-up clutch circuit. This clutch (TCC) blocks torque converter slip at speeds above 40-60 km/h, reducing the load on the automatic transmission and improving efficiency. When the control unit (ECU) detects an unstable signal from the solenoid or sensors, it activates a fault.

On Nissan with boxes RE0F10A (Qashqai J10), JR710 (X-Trail T31) or CVT (Juke) Symptoms may vary, but the general gist is the same: the ECU cannot control the lockup correctly. For example, on Nissan Almera N16 with a 4-speed automatic, the error is often accompanied by jerks when switching to 3rd gear, and in Murano Z51 - lights up Check Engine and the traction when overtaking disappears.

• 🔧 Main causes of P0744:
• 🔹 Wear or contamination of the TCC solenoid (more often on runs >120 thousand km).
• 🔹 Faulty wiring or oxidation of contacts in the solenoid connector.
• 🔹 Low level or poor quality of oil in the automatic transmission (especially after replacing it with a non-original one).
• 🔹 Mechanical wear of the locking clutch or torque converter bearings.
• 🔹 Transmission control module (TCM) firmware failure.

⚠️ Attention: On Nissan With CVTs, the P0744 code may indicate belt wear or a pump solenoid failure. In this case, diagnostics using a scanner with support is required. Nissan Consult — standard OBD2 devices will not show the full picture.

Symptoms of error P0744: how it manifests itself on different models

Symptoms of malfunction depend on the type of box and model Nissan. For example, on Qashqai J11 with a variator, the error can only appear by flashing Check Engine, and on Pathfinder R51 with a 5-speed automatic - jerky when accelerating. General symptoms:

• 🚗 Jerking or slipping when changing gears (especially in 3rd–4th gear).
• 💨 Increased fuel consumption by 10–15% due to constant slipping of the torque converter.
• 🔥 Automatic transmission overheating (can be noticed by the characteristic smell of burnt oil).
• 🛑 Loss of traction when overtaking or climbing (the gearbox is “stupid” and does not shift up).
• 🔄 Spontaneous activation/deactivation of blocking (feels like slight jolts at speeds of 60–80 km/h).

Model Nissan	Automatic transmission type	Typical symptoms P0744
Qashqai J10/J11	RE0F10A / CVT	Jerks during acceleration, lights up Check Engine, loss of dynamics.
X-Trail T31/T32	JR710 / RE0F10D	Shocks in 3rd-4th gear, oil overheating, error appears after warming up.
Juke F15	CVT	Vibrations at speeds of 70–90 km/h, increasing speed without acceleration.
Murano Z50/Z51	RE0F09B	Dips when switching, the error is accompanied by P0730 (incorrect gear ratio).
Navara D40	RE5R05A	Hard impacts when switching, the error appears when towing.

On Nissan with CVTs (for example, Kicks or Ariya) trouble code P0744 is often disguised as other problems, such as P0841 (oil pressure) or P0776 (pressure solenoid). If, after resetting the error, it returns after 50–100 km, the problem is most likely in the mechanical part of the torque converter.

Diagnosing error P0744: step-by-step instructions

Before repairing, it is necessary to accurately determine the cause. Start with computer diagnostics, then move on to mechanical checks. For Nissan it is important to use scanners that support the protocol Nissan Consult (For example, Launch X431 or Autel MaxiCOM), since standard OBD2 devices do not show solenoid parameters in real time.

Check error codes with a scanner (including historical ones)|View data in real time (TCC Solenoid Duty Cycle parameter)|Check the level and condition of the oil in the automatic transmission|Inspect the wiring and connectors of the TCC solenoid|Perform a test drive, recording the moments when the error occurs-->

1. Computer diagnostics

Connect the scanner and follow these steps:

1. Count all errors including Pending Codes (waiting). P0744 is often accompanied by P0740 (general TCC fault) or P0743 (solenoid jammed).
2. Check the parameter TCC Solenoid Duty Cycle (solenoid duty cycle). Normally, it should change smoothly from 0% to 100% during overclocking. If the values ​​fluctuate or hang at 0%, there is a problem with the solenoid or wiring.
3. Write it down Freeze Frame Data (data at the time the error occurred) - this will help determine under what conditions it appears (for example, at a certain speed or load).

2. Checking the automatic transmission oil

Low or contaminated oil is a common cause of P0744. On Nissan with variators (CVT) the oil should be red no burning smell. If the fluid is dark or contains metal shavings, replacement with flushing is required.

To check the level:

1. Warm up the box to operating temperature (drive 10–15 km).
2. Place the car on a flat surface, move the selector to position P.
3. Pull out the automatic transmission dipstick (on some models, for example X-Trail T32, the dipstick is missing - the level is checked through the inspection hole).
4. The level should be between the marks HOT. If the oil is lower, add original oil (Nissan Matic S for automatic transmission or NS-3 for CVT).

⚠️ Attention: On Nissan Juke And Kicks with variator JF015E Changing the oil without special equipment (vacuum pump) can lead to incomplete drainage and the error reappearing. Services for these models use the method complete replacement with flushing (about 12 liters of oil).

3. Check solenoid and wiring

The TCC solenoid is located in the automatic transmission valve body. To check it:

1. Remove the box tray (on some models, e.g. Navara D40, you will need to remove the center differential).
2. Locate the lockout solenoid (it is usually labeled or has a distinctive wire color).
3. Check the solenoid resistance with a multimeter - it should be within 10–25 Ohm. If there is no resistance or tends to infinity, the solenoid is faulty.
4. Check the voltage at the solenoid connector with the ignition on (should be 12 V). No voltage indicates a wiring break or a faulty TCM.

How to check the solenoid without removing the valve body?

On some models (for example, Qashqai J10) you can temporarily connect a scanner and manually activate the TCC solenoid through the menu Actuator Test. If the solenoid does not click when a command is given, it must be replaced. This method is not suitable for CVTs!

How to fix error code P0744: from simple to complex

Repair methods depend on the cause of the problem. Start with the simplest and cheapest methods, gradually moving on to complex ones.

1. Changing the automatic transmission oil

If the oil is dirty or the level is low, replace:

• 🔧 For classic automatic transmissions (X-Trail T31, Pathfinder R51):
• Drain the old oil through the plug (about 4-5 liters).
• Replace the filter (if equipped).
• Refill with original oil Nissan Matic S or D (depending on model).
• 🔧 For CVTs (Juke, Qashqai J11):
• Required complete replacement by displacement method (about 12 liters of oil Nissan CVT Fluid NS-3).
• Be sure to flush the oil cooler.

After replacement, reset the errors with the scanner and perform a test drive. If P0744 goes away, the problem was in the oil. If not, move on to the next step.

2. Clean or replace the TCC solenoid

On models with mileage >150 thousand km, the solenoid often becomes clogged with wear products. You can try to clear it:

1. Remove the valve body (on Murano Z51 you will need to remove the pan and disconnect the connectors).
2. Remove the TCC solenoid (it is usually held in place by 1-2 bolts).
3. Wash it in carburetor cleaner or ultrasonic bath.
4. Check the mobility of the rod - it should move smoothly, without jamming.

If cleaning does not help, the solenoid needs to be replaced. For Nissan the original solenoids are assembled with the valve body (the article number depends on the model of the box, for example, 31397-31X00 for RE0F10A). The cost of a new solenoid is from 3 to 10 thousand rubles.

3. Repair wiring or replace TCM

If the solenoid is good but is not receiving voltage, the problem is in the wiring or control module (TCM). Check:

• 🔌 Connectors on the valve body and TCM - oxidation or poor contact can cause an intermittent error.
• 🔧 Wires from the TCM to the solenoid - check them for a break.
• 🖥️ Control unit - if all other elements are in good condition, the TCM may require flashing or replacement.

⚠️ Attention: On Nissan with CVTs (for example, Ariya) The TCM control unit often “glitches” after disconnecting the battery. If error P0744 appears after replacing the battery, try resetting the box adaptations via the scanner (function TCM Reset).

4. Replacing the torque converter

If all the previous methods did not help, the problem may be in the mechanical part of the torque converter (wear of the lock-up clutch or bearings). In this case you need:

1. Remove the gearbox (to Nissan This is a labor-intensive operation that requires a lift).
2. Dismantle the torque converter and check it on the stand.
3. If play or wear of the clutch is detected, replace the torque converter assembly.

The cost of a new torque converter for Nissan - from 20 to 50 thousand rubles. On models with CVTs, remanufactured components are often installed, since the original ones are too expensive.

Preventing error P0744 on Nissan

To avoid the error reappearing, follow these recommendations:

• 🔄 Change the automatic transmission oil regularly:
• For classic automatic transmissions - every 60–80 thousand km.
• For CVTs (CVT) - every 40–50 thousand km (use only original oil NS-2 or NS-3).
• 🚗 Avoid overheating the box:
• Do not tow heavy trailers on Nissan Navara or Pathfinder without additional automatic transmission cooling radiator.
• Do not hold the car on an incline by pressing the brake - use the handbrake.
• 🔧 Respond promptly to symptoms:
• If jerking occurs or fuel consumption increases, immediately check the oil and scan for errors.
• Don’t ignore even isolated incidents of sunburn Check Engine.

On Nissan With CVTs, it is especially important to avoid sudden starts and long driving at high speeds. These boxes are sensitive to overheating, and belt wear accelerates with aggressive driving.

Frequently asked questions about error P0744 on Nissan

Is it possible to drive with P0744?

Short term - yes, but not recommended. Driving for a long time with a faulty lock-up clutch leads to:

• Accelerated wear of the torque converter.
• Overheating of the oil and reduction of automatic transmission life.
• Increased fuel consumption by 10–15%.

On Nissan with CVTs, driving with P0744 can damage the belt and cones within a few hundred kilometers, which will result in a major overhaul costing 100+ thousand rubles.

How much does it cost to repair P0744 at a service center?

The cost depends on the reason and model:

Type of repair	Cost (RUB)	Notes
Changing the automatic transmission oil	3 000–8 000	For CVT - up to 12,000 (with flushing).
Cleaning/Replacing TCC Solenoid	5 000–15 000	On CVTs, the solenoid is often assembled with the valve body.
Wiring repair/TCM replacement	10 000–30 000	TCM firmware costs 5,000–10,000.
Replacing the torque converter	20 000–50 000	For CVTs - up to 80,000 (with work).

Is it possible to reset the P0744 code without repair?

You can, but she will come back. Resetting the error with a scanner or disconnecting the battery will remove Check Engine, but will not eliminate the cause. On some models (for example, Nissan Teana J32) after resetting, the error returns after 50–100 km.

The exception is if the error appears after changing the oil or battery. In this case, resetting the box adaptations via a scanner will help (function TCM Reset).

What kind of oil should I fill in a Nissan automatic transmission with error P0744?

Use only original oils:

• Nissan Matic S - for classic automatic transmissions (X-Trail T31, Pathfinder R51).
• Nissan Matic D - for some models with a 4-speed automatic transmission.
• Nissan CVT Fluid NS-2/NS-3 — for variators (Qashqai J11, Juke, Kicks).

Non-original oils (for example, Mobil ATF or Castrol Transmax) may cause the TCC clutch to slip and cause the error to reappear.

Why does P0744 appear after an oil change?

Reasons:

• Insufficient oil level (not topped up after replacement).
• Using non-original or low-quality oil.
• The box adaptations have not been reset (on CVTs it is necessary to perform TCM Reset).
• Air entering the system (CVT requires oil bleeding).

On Nissan with CVTs, after changing the oil, you need to drive 20–30 km in a gentle mode so that the box “learns” the new parameters.