Error P1706 on Nissan: interpretation, causes and solutions

Error code P1706 on cars Nissan - one of the most common problems associated with the operation of an automatic transmission. This signal makes many owners nervous, because ignoring the malfunction can lead to serious gearbox damage and costly repairs. Unlike engine errors, which often appear immediately (e.g. Check Engine), P1706 can go unnoticed for a long time, masquerading as ordinary automatic transmission “glitches”: jerking, delays when switching, or unstable operation when cold.

In this article we will look in detail at what is hidden behind the code. P1706what models Nissan most susceptible to this problem (spoiler: Qashqai, X-Trail And Teana are the leaders in service center statistics), and most importantly, how to independently diagnose and fix the malfunction. We will not limit ourselves to template advice like “check the wires”: you will receive specific instructions taking into account the features of the electronics Nissan, including unique nuances of working with Jatco control units (RE0F10A/RE0F11A), which are rarely covered in open sources.

What does error code P1706 mean on Nissan?

Code P1706 stands for "Torque Converter Lockup Solenoid Circuit Malfunction" (Torque Converter Clutch Solenoid Circuit Malfunction). Translated into simple language: the electronic control unit (ECU) of the transmission has detected a problem in the operation of the solenoid responsible for locking the torque converter (GDT). This solenoid is a key element of the system that provides:

• 🔹 Smooth gear shifting without jerking
• 🔹 Reduced fuel consumption on the highway (due to a rigid connection between the engine and gearbox)
• 🔹Preventing transmission fluid from overheating

When the ECU detects incorrect signals from the solenoid (or their absence), it activates an error P1706 and transfers the automatic transmission to emergency mode. In this mode the box can:

• 🚗 Stuck in one gear (usually 3rd)
• 🚗 Refuse to switch up/down
• 🚗 Jitter when accelerating

It is important to understand that P1706 - this is not a verdict on the box, but a signal about the need for diagnostics. In 60% of cases, the problem is solved without disassembling the automatic transmission, but ignoring the error leads to wear of the clutches and breakdown of the torque converter.

Reasons for error P1706

The engine block solenoid is a solenoid valve controlled by the ECU. Its malfunction can be caused by both mechanical and electrical problems. Here is a complete list of possible causes, ranked by frequency of occurrence:

Reason	Frequency (%)	Difficulty in eliminating
Contaminated transmission fluid (ATF)	35%	Low (replace ATF + filter)
Engine blocking solenoid malfunction	25%	Medium (replacing solenoid or valve plate)
Wiring/connector problems	20%	Low (check contacts)
Transmission ECU (TCM) malfunction	15%	High (flashing or block replacement)
Mechanical wear of the torque converter	5%	High (repair/replacement of gas turbine engines)

Dirty ATF - leader among causes P1706. Over time, the fluid loses its properties and clogs the valve body channels and solenoids. This is especially critical for models with boxes Jatco RE0F10A (installed on Nissan Qashqai J10/J11, X-Trail T31/T32), where the solenoids are sensitive to oil quality. If you have never changed ATF or done it less often than every 60,000 km, start diagnostics with liquid.

Electrical problems often associated with oxidation of contacts in the solenoid connector or broken wiring. For example, on Nissan Teana J32 A common problem is with the wiring harness near the box fraying due to vibrations. You can check this with a multimeter (the solenoid resistance should be within 10–20 Ohm).

⚠️ Attention: If the error P1706 accompanied by code P0740 (“Torque converter lockup malfunction”), the probability of mechanical wear of the gas turbine engine or solenoid increases to 80%. In this case, the box will need to be disassembled.

Symptoms of Error P1706: How to Recognize the Problem

Error P1706 rarely appears “on its own” - it is usually preceded by noticeable changes in the behavior of the automatic transmission. Here are the key symptoms to watch out for:

• 🔴 Jerks when shifting gears (especially from 1st to 2nd or when braking)
• 🔴 Acceleration delays (“dullness” of the box for 2–3 seconds)
• 🔴 Increased engine speed without increasing speed (gas engine slips)
• 🔴 Unstable operation at idle (vibrations, twitching)
• 🔴 Enabling emergency mode (lights up on the dash) AT or Check Engine)

On models with a trip computer display (for example, Nissan Murano Z51) the error may appear as Transmission Hot or Service Transmission Soon. This is an indirect sign of ATF overheating due to incorrect operation of the lock solenoid.

An interesting nuance: on some cars (in particular, Nissan Pathfinder R51) error P1706 appears only when cold start and disappears after warming up. This is because cold ATF is more viscous and the solenoid cannot overcome the fluid resistance. If the symptoms disappear after 5-10 minutes, the problem is most likely in the fluid or a clogged filter.

Diagnosing error P1706: step-by-step instructions

To pinpoint the cause P1706, a comprehensive review will be required. Start with the simplest steps and gradually move on to more complex ones:

1. Read all errors by scanner (not only P1706). It is often accompanied by codes P0730 (incorrect gear shifting) or P0740 (problems with gas turbine engines). This will help narrow down your search.
2. Check ATF level and condition:
   • 🔧 Color: should be red or light brown. Black or with metal shavings - critical.
   • 🔧 Smell: A burnt smell indicates overheating.
   • 🔧 Level: check on a heated box (see instructions for your model).
3. Test the engine block solenoid:
   • 🔧 Disconnect the solenoid connector (located on the valve plate of the box).
   • 🔧 Measure the resistance with a multimeter: normal - 10–20 Ohm.
   • 🔧 Apply voltage 12 V on the solenoid contacts: a click should be heard.
4. Check wiring and connectors:
   • 🔧 Inspect the wiring harness for chafing (especially near the box).
   • 🔧 Clean the contacts of the ECU connectors and solenoids (oxidation is a common cause of false positives).

If the solenoid and wiring are ok but the error remains, the cause may be ECU firmware failure. For example, on Nissan Juke F15 with box RE0F10D cases are known when P1706 appeared after a software update by the dealer. In this case, resetting adaptations or flashing the unit helps.

How to fix error P1706: from simple to complex

The repair method depends on the cause of the problem. Below are step-by-step solutions for each case, from the most affordable to the major ones.

1. Replacing transmission fluid (ATF) and filter

If the ATF is dirty or has a burning smell, it necessarily needs to be replaced. For most models Nissan suitable liquid Nissan Matic S or D (depending on the type of box). Volume - 8–12 liters for a complete replacement.

Important: when replacing ATF always change the coarse filter (located in the tray of the box). On used models > 100,000 km It is also recommended to wash the tray and magnets from metal shavings.

2. Cleaning or replacing the gas turbine engine blocking solenoid

If the solenoid does not click when voltage is applied or its resistance is outside the limits 10–20 Ohm, it needs to be replaced. On boxes Jatco solenoids are sold both separately and as part of a valve plate (valve block). The cost of the original solenoid is from 3,000 rub., valve plate - from 20,000 rub..

When replacing a solenoid, be sure to:

• 🔧 Use original spare parts (analogues often fail after 10–20 thousand km).
• 🔧 Wash the valve plate with a special liquid (for example, Liqui Moly ATF Reiniger).
• 🔧 Swipe box adaptation after replacement (via a scanner or the “learning” method - see the instructions for your model).

3. Repair of wiring or connectors

If the problem is broken wires or oxidation of contacts, restore the circuit:

• 🔧 Clean the contacts of the ECU connectors and solenoids (use contact lubricant after cleaning).
• 🔧 Replace damaged wires (the cross-section must be at least 0.5 mm²).
• 🔧 Check the “weight” of the box - it often oxidizes on the body under the automatic transmission.

4. Flashing or replacing the transmission ECU (TCM)

If the error P1706 appears after replacing the solenoid and checking the wiring, the control unit itself may be to blame. On models Nissan with boxes Jatco RE0F10A/RE0F11A Known problems with firmware versions 31001-4M00A And 31001-4M01A. Solution:

• 🔧 Update the unit’s software through a dealer or specialized service.
• 🔧 Reset the box adaptations (via a scanner or by disconnecting the battery for 10 minutes).
• 🔧 As a last resort, replace the TCM (the cost of the original unit is from 30,000 rub.).

⚠️ Attention: On Nissan Almera N16 And Primera P12 with box RE4F03B error P1706 may be false due to a faulty ATF temperature sensor. Before replacing the solenoid, check this sensor (resistance at 20°C - about 2 kOhm).

Nissan Models Most Affected by P1706

Some models Nissan suffer from P1706 more often than others due to the design features of gearboxes. Here are the TOP 5 “problem” cars:

Model	Box type	Common causes of P1706	Recommendations
Nissan Qashqai J10/J11	Jatco RE0F10A	Dirty ATF, worn solenoids	Change ATF every 60,000 km, use Matic S
Nissan X-Trail T31/T32	Jatco RE0F10A/RE0F11A	Wiring problems, ECU failures	Check connectors for corrosion, update TCM software
Nissan Teana J32	Jatco RE0F10D	Chafing the wiring harness	Secure the harness with clamps and check the ground
Nissan Murano Z51	Jatco RE0F09B	Worn torque converter	Diagnose along with error P0740
Nissan Juke F15	Jatco RE0F10D	ECU firmware failures	Update software from an official dealer

On Nissan Pathfinder R51 And Navara D40 error P1706 often accompanied P0730 (“Incorrect gear shift”). This is due to the characteristics of the valve body RE5R05A, where the gas turbine blocking and gear shift solenoids are located close to each other. In this case, a comprehensive diagnosis is required.

Why does error P1706 appear on Nissan Qashqai J11 after replacing the ATF?

On Qashqai J11 with box RE0F10D After replacing the ATF, a reset of the box adaptations is required. If this is not done, the ECU continues to use the old calibrations, which leads to false positives. P1706. The reset is performed via a scanner (for example, Launch X431) or by disconnecting the battery for 15 minutes.

Prevention of error P1706: how to avoid problems with automatic transmission

Prevent occurrence P1706 easier than eliminating its consequences. Here are the key preventive measures:

• 🛢️ Regular ATF replacement: every 60,000 km (or once every 4 years). Use only original fluid Nissan Matic.
• 🔧 Checking the oil level: once a month on a heated box. A low level is a direct road to wear of the solenoids.
• 🚗 Smooth riding style: Avoid sudden starts and braking, especially when cold.
• 🔌 Connector diagnostics: Once a year, clean the contacts of the ECU and solenoids from oxidation.
• 📱 Software update: if an official update for TCM has been released, install it (especially relevant for Juke And Qashqai).

On used cars > 150,000 km It is also recommended:

• 🔧 Replacing the ATF fine filter (located in the oil cooling radiator).
• 🔧 Flushing the hydraulic unit with a special liquid (for example, Wynn’s TransClean).
• 🔧 Diagnosis of the torque converter for wear (checked at the stand).

If you frequently drive in traffic or tow a trailer, reduce the ATF change interval to 40,000 km. Overheating is the main enemy of gas turbine engine blocking solenoids!

Frequently asked questions about error P1706

Is it possible to drive with error code P1706?

Short term - yes, but no more 1–2 weeks. Driving for a long time with this error leads to:

• 🔹 Accelerated wear of friction clutches and torque converter.
• 🔹 Overheating of ATF and clogging of valve body channels.
• 🔹 Risk of complete blocking of the box (a tow truck will be required).

If the box goes into emergency mode, movement is only possible to the nearest service station.

How much does it cost to repair error code P1706?

The cost depends on the reason:

• 💰 Replacement ATF + filter: 5,000–10,000 rub.
• 💰 Cleaning/replacing the solenoid: 3,000–15,000 rub.
• 💰 Wiring repair: 2,000–5,000 rub.
• 💰 ECU flashing: 5,000–10,000 rub.
• 💰 Automatic transmission overhaul: from 50,000 rub.

On Nissan with boxes Jatco average elimination bill P1706 — 10,000–25,000 rub..

Can P1706 appear after replacing the ATF?

Yes, and this is a common situation. Reasons:

• 🔹 Box adaptations have not been reset (a scanner or battery disconnection is required).
• 🔹 Non-original ATF was used (for example, Dexron VI instead of Matic S).
• 🔹 Dirt got into the box during replacement (the system needs to be flushed).

Solution: repeat ATF replacement with flushing, reset adaptations, use only original fluid.

How to reset error P1706 without a scanner?

Workaround:

1. Disable negative battery terminal for 15–20 minutes.
2. Start the car and let it idle 5–10 minutes (The ECU will relearn).
3. Drive 10–15 km in a gentle mode (without sudden acceleration).

If the error returns, in-depth diagnostics are required.

What ATF to fill in Nissan with error P1706?

Only original liquid for your box:

• 🔹 Nissan Matic S - for boxes RE0F10A, RE0F10D, RE0F11A (Qashqai, X-Trail, Juke).
• 🔹 Nissan Matic D - for RE4F03B, RE5R05A (Pathfinder, Navara, Teana).
• 🔹 Nissan Matic J - for JK40, JK41 (Murano, 370Z).

The use of analogues (for example, Mobil ATF 3309) is only allowed when the system is completely flushed and if this is permitted by the manufacturer for your model.