Error Code P0745 on Nissan: Torque Converter Pressure - Causes and Solutions

Fault code P0745 on cars Nissan - one of those mistakes that can confuse even experienced car owners. It signals problems with pressure in the torque converter (torque converter), which directly affects the operation of the automatic transmission. If you see this code on your dashboard Qashqai, X-Trail or another brand model, it cannot be ignored: the consequences can range from loss of dynamics to complete failure of the automatic transmission.

In this article we will analyze in detail what is hidden behind the error. P0745, what systems it affects, and why its appearance is often accompanied by jerks when shifting gears or slipping. You'll learn how to diagnose the problem yourself (including checking oil pump, solenoids And control unit), and also when a visit to the service is indispensable. We will pay special attention to models Nissan with CVTs Jatco, where the P0745 error occurs most often.

What does P0745 mean on Nissan?

Code P0745 stands for "Pressure Control Solenoid 'A' Malfunction" - malfunction Pressure Control Solenoid "A" in the automatic transmission valve body. In context Nissan this error is usually associated with:

• 🔧 Insufficient oil pressure in the torque converter, which causes the lock-up clutch to slip.
• ⚡ Electrical problems in the solenoid circuit (open circuit, short circuit or contact oxidation).
• 🛢️ Dirt or wear oil pump, automatic transmission filter or valve body channels.
• 🔄 Incorrect operation of the control unit (ECU) that does not regulate pressure correctly.

Error in practice P0745 often accompanied by symptoms:

• ⚠️ Jerks when changing gears (especially when “cold”).
• 🚗 Slipping when accelerating or climbing a mountain.
• 🔥 Gearbox overheating (the light may come on AT OIL TEMP).
• 📉 Engine power drops for no apparent reason.

It is important to understand that P0745 - this is not a sentence, but a signal to action. In the early stages, the problem can be solved by changing the oil or cleaning the solenoids, but if you ignore it for months, a major overhaul of the automatic transmission will be required.

Reasons for error P0745

To effectively eliminate P0745, you need to understand its root cause. The table below contains the most common causes for cars Nissan with automatic transmission and CVT:

Reason	Symptoms	Models where it occurs most often
Oil pump wear	Noise in the automatic transmission, drop in oil pressure, error appears when "hot"	Qashqai J10, X-Trail T31
Dirty solenoids	Jerks when switching, the error is reset after restarting the engine	Juke, Note
Malfunction of the control module (TCM)	The error appears chaotically, accompanied by other codes (for example, P0730)	Murano Z51, Pathfinder R51
Low or old ATF level	Slipping, overheating of the gearbox, error after a long drive	All models with CVT Jatco
Mechanical wear of the torque converter	Vibrations at idle, metal shavings in oil	Navara D40, Patrol Y61

Critical Point: If the P0745 code is accompanied by a P0740 code ("Torque Converter Clutch Circuit Malfunction"), it almost always indicates a faulty torque converter clutch. In this case, driving without repair is fraught with destruction of the turbine wheels and costly repairs.

On models Nissan with CVTs (for example, Qashqai J11 or X-Trail T32) error P0745 often occurs due to variator belt wear or malfunction driving/driven pulleys. In this case, complex diagnostics with checking the pressure in the system is required.

⚠️ Attention: If after resetting the error P0745 it returns within 5–10 km of run, this indicates mechanical failure (for example, a crack in the valve body or wear on the pump). In this case, independent repair is not recommended - disassembly of the automatic transmission is required.

How to diagnose P0745 yourself

Before going to the service center, you can perform preliminary diagnostics on your own. Here's the step-by-step plan:

1. Count all the mistakes scanner (for example, Launch CReader or ELM327). Error P0745 rarely appears alone - often accompanied P0730 (incorrect gear ratio), P0740 (torque converter clutch) or P0841 (pressure in the solenoid circuit).
2. Check the level and condition of the ATF oil:
   • 🔹 Oil should be red (not black or brown).
   • 🔹 Shouldn't smell burning.
   • 🔹 Check the level at hot box (after 10–15 km of driving).
3. Test solenoids:
   • 🔧 Remove the automatic transmission pan and check the condition of the filter (dirty - replace).
   • 🔧 Test the solenoids windings with a multimeter (the resistance should be within 10–30 Ohm).
4. Check the electrical circuit:
   • ⚡ Disconnect the solenoid block connector and inspect the contacts for oxidation.
   • ⚡ Make sure that the solenoids are receiving 12 V with the ignition on.

If you find:

• 🛢️ Dirty oil with metal shavings → the oil and filter need to be replaced, and the valve body may need to be flushed.
• ⚡ Open or short circuit in the solenoid circuit → wiring repair or solenoid replacement.
• 🔧 Solenoid wear (resistance is outside normal) → replacement of solenoids or the entire valve body.

For models Nissan with CVTs (Qashqai J11, X-Trail T32) it is additionally recommended to check:

• 📊 System pressure (for this you need a pressure gauge and an adapter). Normal pressure at idle - 4–6 bar.
• 🔄 Condition of the variator belt (if worn, replacement along with pulleys is required).

Step-by-step instructions for resolving error P0745

Depending on the cause, repair methods will vary. Below are algorithms for the most common cases.

1. Changing the automatic transmission oil and filter

If the oil is old or contaminated, replacing it may temporarily resolve the error. P0745. For Nissan recommended:

• 🛢️ Use original oil Nissan Matic S (for automatic transmission) or NS-3 (for CVTs).
• 🔧 Change the filter every time when changing the oil (even if it is visually clean).
• 🔄 When completely changing the oil (with removing the pan), it is required 8–10 liters ATF.

Instructions:

1. Warm up the box (drive 10–15 km).
2. Drain the oil through the plug in the pan.
3. Remove the tray and clean the magnets from chips.
4. Replace the filter and pan o-ring.
5. Fill in new oil through the dipstick (for CVTs - through the filler neck).
6. Adapt the box (for CVTs - using a scanner Consult III or similar).

2. Cleaning or replacing solenoids

If the solenoids are dirty or worn, you can try cleaning or replacing them. For Nissan solenoids are sold both separately and assembled with a valve body.

Cleaning solenoids:

• 🧹 Use special cleaner (For example, Liqui Moly ATF Reiniger).
• 🔧 Do not disassemble the solenoids yourself - this can damage the plungers.
• 🔄 After cleaning, be sure to adaptation of solenoids scanner.

Replacing solenoids:

• 🛠️ To replace, you will need to remove the hydraulic unit (on some models - along with the pallet).
• 🔧 Original solenoids for Nissan have articles like 31397-XXXX (check by VIN).
• ⚡ After replacement, reset errors and perform automatic transmission training.

How to check solenoids without removing the valve body?

On some models Nissan (For example, Qashqai J10) you can test the solenoids by applying 12 V voltage to them from the battery. If the solenoid is good, you will hear a clicking sound. No click or jamming indicates a malfunction.

3. Repair or replacement of the torque converter

If the problem is with the torque converter lock-up clutch, it will need to be repaired or replaced. Signs:

• 🚗 Vibrations at speed 60–80 km/h.
• 🔥 Overheating of the box (ATF temperature is higher 120°C).
• 📉 Loss of power when overtaking.

Repair options:

• 🔧 Replacement of clutch friction discs (if wear is not critical).
• 🛠️ Replacing the torque converter assembly (original for Nissan worth it 50–150 thousand rubles.).
• 🔄 Balancing the torque converter (mandatory after repair!).

⚠️ Attention: On CVTs Jatco (installed in Qashqai J11, X-Trail T32) the torque converter is integrated into the box. Replacing it requires complete removal of the variator and specialized tools. It is not recommended to perform this work without experience!

When can you not do without a service?

Some faults causing the error P0745, cannot be eliminated in a garage environment. Contact the service if:

• 🔧 Required automatic transmission disassembly (for example, replacing worn clutches or bearings).
• 📊 Needed flashing the control unit (TCM) - this requires specialized equipment (Consult III/IV).
• 🛠️ Diagnostics showed mechanical wear planetary gear set or shaft.
• ⚡ The error is accompanied by other critical codes (For example, P0700 — automatic transmission malfunction).

The cost of repairs in the service depends on the reason:

Type of work	Cost (RUB)	Deadlines
Diagnostics + error reset	1 500 – 3 000	1–2 hours
Replacement of solenoids (1 pc.)	5 000 – 12 000	3–5 hours
Torque converter repair	20 000 – 50 000	1–2 days
Automatic transmission overhaul	60 000 – 150 000	3–7 days

For CVTs Jatco (installed in Nissan Qashqai, X-Trail, Juke) it is recommended to contact services specializing in CVT. Improper repairs can lead to complete failure of the box.

Preventing error P0745 on Nissan

To avoid reappearance P0745, follow the recommendations:

• 🛢️ Change ATF oil every 60,000 km (for CVTs - 40,000 km).
• 🔧 Use only original oil or analogues with approval Nissan.
• 🚗 Avoid aggressive driving (sharp starts, towing heavy trailers).
• 📊 Reset regularly adaptive automatic transmission settings (once every 20,000 km).
• 🔥 Follow box temperature (optimally - 80–95°C).

For CVTs Jatco additionally:

• 🔄 Every 100,000 km check condition of belt and pulleys.
• 🛠️ When changing the oil, be sure to change variator filter (article 31726-XXXX).

If you often drive off-road or in city traffic jams, reduce the oil change interval to 30,000–40,000 km. This will extend the life of the box and prevent P0745.

Frequently asked questions about error code P0745

Is it possible to drive with P0745?

Short term - yes, but no more 100–200 km. Driving for a long time with this error leads to:

• 🔥 Overheating of the box and oil degradation.
• 🛠️ Accelerated wear of friction clutches and bearings.
• 💥 Risk of torque converter jamming.

If the error is accompanied by jerking or slipping, it is better to stop driving and call a tow truck.

Why does P0745 appear after an oil change?

This is typical for CVTs Nissan and related to:

• 🛢️ Incorrect oil level (overfilling or underfilling).
• 🔧 Poor quality oil (for example, using Dexron VI instead of NS-3).
• 🔄 Lack of adaptation after replacement (reset of errors by scanner is required).

Solution: Check the oil level on the hot box and adapt.

How much does it cost to repair a P0745 at a service center?

The cost depends on the reason:

• 🔧 Solenoid replacement — 5,000–15,000 rub.
• 🛢️ Complete oil change + filter — 8,000–15,000 rub.
• 🔄 Torque converter repair — 20,000–50,000 rub.
• 🛠️ Automatic transmission overhaul — 60,000–150,000 rub.

For CVTs prices are higher by 20–30% due to the complexity of the design.

Can I reset the P0745 code myself?

Yes, but this is a temporary solution. Methods:

• 🔧 Disconnect the battery terminal on 10–15 minutes (all errors will be reset, but they may return).
• 📱 Use a diagnostic scanner (for example, ELM327 + application Torque Pro).

If the error returns, repair is required.

What oil to pour into a Nissan automatic transmission with error P0745?

Depends on the type of box:

• 🔧 Classic automatic transmission — Nissan Matic S or D (article KE908-99932).
• 🔄 CVT — Nissan NS-2 (before 2010) or NS-3 (after 2010).

Using non-original oil may worsen the problem!