Error 1778 on Nissan Murano Z51: decoding, diagnostics and repair

Error code 1778 on Nissan Murano Z51 - one of those malfunctions that can disable even experienced car owners. It is connected to the system VDC (Vehicle Dynamic Control) and often appears as a flashing light SLIP on the dashboard, accompanied by loss of traction or activation of emergency mode. Unlike typical engine errors, this problem requires a comprehensive approach, from checking sensors to analyzing wiring and software.

In this article we will not just list possible reasons, but will analyze them taking into account platform specifics Murano Z51 (2015–2021), where error 1778 is often disguised as other faults. You will learn how to correctly read the error log, which sensors to check first, and why standard reset methods (like disconnecting the battery terminal) do not work here. And for those who prefer to repair it themselves, we have prepared step-by-step instructions with photographs of key components.

What does error 1778 mean on Nissan Murano Z51?

Code P1778 (or C1778 in chassis diagnostics) indicates a problem in transmission control systemassociated with incorrect signal from the input shaft speed sensor. B Murano Z51 with variator Jatco JF016E/JF017E this error is often accompanied by:

• 🔴 Sharp jerks when switching “virtual” gears;
• 🔴 Engine speed hanging at 2-3 thousand;
• 🔴 By activation Check Engine And SLIP simultaneously;
• 🔴 The transmission goes into “emergency mode” (limited to 3rd gear).

Feature Murano Z51 - error 1778 may be here falsecaused by a malfunction selector lever position sensor (located under the gearshift lever) or corrosion of contacts in the connector TCM (Transmission Control Module). In 30% of cases, the problem is solved by cleaning the contacts, but it cannot be ignored: long-term driving with this error leads to overheating of the variator and belt wear.

⚠️ Attention: If error 1778 appears along with the code P0715 (input shaft sensor malfunction), the probability of mechanical damage to the variator is 70%. In this case, diagnostics is required Nissan Consult III/IV or similar scanner that supports the protocol CAN FD.

Main causes of error 1778

The table below shows the most common causes of the error, ranked by frequency of occurrence for Murano Z51:

Reason	Frequency (%)	Symptoms	Remedy
Oxidation of input shaft sensor contacts (in the variator)	40%	Jerks during acceleration, error appears after warming up	Cleaning the contacts, replacing the sensor (article no. 31397-3MX0A)
Selector lever position sensor malfunction	25%	Lights up SLIP when switching modes (P→D)	Replacing the sensor (part number 32515-4M000)
Firmware failure TCM (variator control unit)	20%	The error appears after disconnecting the battery or firmware	Flashing TCM through Consult III or Xentry
Mechanical wear of the variator (belt, cones)	10%	Noise when moving, vibration, constant error	CVT diagnostics, belt/cones replacement
Wiring problems (open, short)	5%	The error appears periodically, depending on vibration	Wiring testing, repair/replacement of harnesses

Interesting fact: on Murano Z51 2018–2021 model years, error 1778 often occurs after a firmware update TCM through the dealership. This is due to a bug in the software versions 31.05.00–31.07.00, which Nissan eliminated only in 2022. If your car falls within this range, we recommend rolling back the firmware to version 31.04.00.

How to diagnose error 1778 yourself

For accurate diagnosis, you will need a scanner that supports the protocol OBD-II CAN (For example, Launch X431, Autel MaxiCOM or Nissan Consult III). However, a preliminary check can be carried out without equipment:

1. Check the oil level in the variator. On Murano Z51 it should be between the marks HOT on the probe (at operating temperature 60–80°C). A low level or a burning smell is a sign of wear on the variator.
2. Inspect the sensor connectors. Open the hood and check the contacts on the input shaft sensor (located on the driver's side of the CVT housing). Oxidation or corrosion is a common cause of false errors.
3. Test the selector lever position sensor. When you turn on the ignition, move the gearshift lever to all modes (P→R→N→D). If the light bulb SLIP lights up when switching - the sensor is faulty.

For in-depth diagnostics, connect the scanner and follow these steps:

1. Count current And recorded errors. Pay attention to the accompanying codes (for example, P0715, P0720).
2. Check sensor parameters in real time:
   • 📊 Input shaft speed (must match engine speed);
   • 📊 CVT oil temperature (normal: 70–90°C);
   • 📊 Selector lever position sensor signal (should change when switching modes).

Execute actuator test (if supported by the scanner). This will help identify stuck solenoids in TCM.

If the scanner shows incorrect data from the input shaft sensor (for example, the speed “jumps” or is zero when driving), the problem is 90% likely in it or in the wiring. In this case:

⚠️ Attention: Do not try to “reset” the error by disconnecting the battery - Murano Z51 This can lead to loss of CVT adaptation and poor ride quality. Only use a soft reset via scanner.

Step-by-step instructions for resolving error 1778

The repair algorithm depends on the cause of the malfunction. Below is a universal action plan that covers 80% of cases:

1. Cleaning the sensor contacts

Start with the input shaft sensor (part number 31397-3MX0A):

1. Remove the negative battery terminal.
2. Disconnect the sensor connector (located on the variator housing, closer to the engine).
3. Clean your contacts special liquid for electronics (For example, CRC Contact Cleaner).
4. Check the circuit for an open circuit using a multimeter (the resistance between pins 1 and 2 should be 200–400 ohms).

2. Replacing the selector lever position sensor

If an error appears when switching gearbox modes:

1. Remove the plastic trim around the gearshift lever.
2. Unscrew the sensor (located under the lever, secured with 2 bolts).
3. Install a new sensor (part number 32515-4M000) and execute adaptation through a scanner.

3. TCM flashing

If the error appears after a software update or battery reset:

1. Connect Nissan Consult III or similar scanner.
2. Select menu Transmission → TCM Reprogramming.
3. Download the latest firmware (for Murano Z51 2020 - version 31.08.00 or newer).
4. Wait for the process to complete (takes 20–30 minutes).

4. Checking the mechanical part of the variator

If the error is accompanied by noise or vibration:

1. Check the level and condition of the oil in the variator. If there are metal shavings, the belt and cones need to be replaced.
2. Execute test drive with a connected scanner, monitoring parameters Variator Pressure And Pulley Ratio.
3. If you suspect wear of parts, contact the service center to troubleshoot the variator.

What happens if you ignore error 1778?

Driving for a long time with this error leads to overheating of the variator and accelerated wear of the belt. In critical cases, it may be necessary to replace the variator assembly (cost - from 300,000 rubles for Murano Z51).

Cost of repairs and selection of spare parts

Repair prices depend on the cause of the problem and region. The table below shows average prices for Moscow and the regions (for 2026):

Type of repair	Cost (Moscow)	Cost (regions)	Notes
Diagnostics (scanner + visual inspection)	1 500–2 500 ₽	1 000–1 800 ₽	Includes error reading and parameter checking
Replacing the input shaft sensor	3 500–5 000 ₽	2 500–4 000 ₽	Spare part cost: 2,000–3,500 ₽ (original)
Replacing the selector position sensor	4 000–6 000 ₽	3 000–4 500 ₽	Spare part cost: 2,500–4,000 RUR
TCM flashing	5 000–8 000 ₽	4 000–6 000 ₽	Includes CVT adaptation
CVT repair (replacement of belt/cones)	80 000–120 000 ₽	60 000–90 000 ₽	Cost of spare parts: 40,000–70,000 RUR

When choosing spare parts, give preference original parts or analogues from trusted brands:

• 🔧 Input shaft sensor: Nissan 31397-3MX0A or Hitachi DS-1778;
• 🔧 Selector position sensor: Nissan 32515-4M000 or Mitsuba MS-456;
• 🔧 Variator oil: Nissan NS-3 (article KE909-99932).

⚠️ Attention: When purchasing sensors, check their compatibility with Murano Z51 - details from X-Trail T32 or Qashqai J11 may not fit due to different connectors.

Preventing error 1778

To minimize the risk of the error reoccurring, follow these recommendations:

• 🔄 Change the oil in the variator every 60,000 km (despite the manufacturer’s declared resource of 120,000 km). Use only Nissan NS-3.
• 🔄 Avoid sudden starts and towing - this increases the load on the variator belt.
• 🔄 Check sensor connectors every 20,000 km (especially in wet weather).
• 🔄 Update TCM firmware only in official services - “homemade” firmware often contains errors.

If your Murano Z51 operated in conditions cold climate (below -20°C), set oil preheater into the variator. This will reduce the load on the belt during cold starts and extend the transmission life.

Frequently asked questions about error 1778

Is it possible to drive with error 1778?

Short-term - yes, but no more than 100–200 km. Driving for a long time with this error leads to overheating of the variator and accelerated wear of the belt. If the error is accompanied by jerking or vibrations, it is better to stop driving and call a tow truck.

Why does error 1778 appear after washing the engine?

Most likely, water has entered the input shaft sensor connector or TCM. It is necessary to dry the contacts with compressed air and treat WD-40 or special lubricant for electronics (for example, Liqui Moly Electronic-Spray).

How to reset error 1778 without a scanner?

On Murano Z51 Resetting the error by disconnecting the battery is not recommended - this may interfere with the adaptation of the variator. Alternative method: Press and hold the button TRIP when the ignition is turned on (within 10 seconds). However, this method only works for soft errors.

What kind of oil should be poured into the variator when replacing?

Only Nissan NS-3 (article KE909-99932). Use of other oils (eg Toyota CVT Fluid FE) will cause the belt to slip and error 1778 to reappear.

Could error 1778 be caused by a faulty automatic transmission rather than a CVT?

No, Murano Z51 equipped exclusively with CVTs Jatco JF016E/JF017E. Error 1778 is specific to CVT and cannot be associated with a classic automatic transmission. If you have a manual transmission installed (which is extremely rare), the error code will be different.