AutoCodes – Nissan – P1740 Nissan

P1740 Nissan Code - Lock-up Select Solenoid Valve Circuit

Quick Answer

The lock-up select solenoid valve is installed to control valve. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Lock-up Select Solenoid Valve. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1740 Nissan indicates Lock-up Select Solenoid Valve Circuit.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Lock-up Select Solenoid Valve.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 41,664

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 28, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1740 Nissan Description

The lock-up select solenoid valve is installed to control valve. The lock-up select solenoid valve controls the select switch valve that switches the oil pressure applied to the lock-up clutch, forward clutch or reverse clutch. The lock-up select solenoid valve utilizes an ON-OFF solenoid valve. The only operations of the valve spool installed inside the coil are pressing or not pressing the ball which seals the hydraulic supply section into the seat. This A/T uses N/L (normal low) type. When the voltage is not applied to the coil, the force of the pilot pressure presses the ball against the seat, stopping the pilot pressure at that point. When the voltage is applied to the coil, the valve is pulled in the direction of the coil, disengaging the hydraulic
seal which the ball creates. This supplies pilot pressure to the operating locations.

OBDII Code P1740 Nissan - Lock-up Select Solenoid Valve Circuit - AutoCodes.com — P1740 Nissan Code - Lock-up Select Solenoid Valve Circuit

What does this mean?

What are the Possible Causes of the DTC P1740 Nissan?

Low transmission fluid level
Dirty transmission fluid
Faulty Lock-up Select Solenoid Valve
Lock-up Select Solenoid Valve harness is open or shorted
Lock-up Select Solenoid Valve circuit poor electrical connection

How to Fix the DTC P1740 Nissan?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1740 Nissan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1740 Nissan code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1740 Nissan Code

1. What are the common symptoms of OBDII code P1740 in a Nissan related to the Lock-up Select Solenoid Valve Circuit?

- Common symptoms include harsh shifting, transmission slipping, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1740 in a Nissan?

- The code P1740 in a Nissan is typically caused by a faulty lock-up select solenoid valve, damaged wiring or connectors in the circuit, low transmission fluid levels, or a malfunctioning transmission control module (TCM).

3. How can I diagnose OBDII code P1740 in my Nissan?

- Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the transmission fluid level and condition, testing the lock-up select solenoid valve and its circuit for continuity and proper operation, and checking for any damaged wiring or connectors.

4. Can I continue driving my Nissan with OBDII code P1740 present?

- It is not advisable to continue driving your Nissan with code P1740 present, as it can lead to further damage to the transmission and potentially result in more costly repairs.

5. How can I repair OBDII code P1740 in my Nissan?

- Repairing OBDII code P1740 involves replacing the faulty lock-up select solenoid valve, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and resetting the trouble codes.

6. Is it possible to clear OBDII code P1740 in my Nissan without fixing the issue?

- Clearing the code without addressing the underlying issue is not recommended, as the problem will persist and may lead to more severe transmission issues over time.

7. How much does it typically cost to repair OBDII code P1740 in a Nissan?

- The cost of repairing OBDII code P1740 in a Nissan can vary depending on the exact cause of the issue, but it generally ranges from $200 to $600, including parts and labor.

8. Can a DIY enthusiast fix OBDII code P1740 in a Nissan?

- While some aspects of diagnosing and repairing OBDII code P1740 can be done by a DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair to avoid further complications.

9. How long does it take to repair OBDII code P1740 in a Nissan?

- The time required to repair OBDII code P1740 in a Nissan can vary depending on the extent of the issue and the availability of parts, but it typically takes a few hours to a day to complete the repair.

10. Will fixing OBDII code P1740 improve the performance of my Nissan's transmission?

- Yes, fixing OBDII code P1740 and addressing the underlying issue with the lock-up select solenoid valve circuit can improve the performance, shifting smoothness, and overall reliability of your Nissan's transmission.