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P1740 Nissan Code - Lock-up Select Solenoid Valve Circuit

Quick Answer

The P1740 Nissan code indicates a problem with the lock-up select solenoid valve circuit in the vehicle's transmission system. Common causes include Faulty lock-up select solenoid valve, Wiring or connector issues in the circuit, Low transmission fluid level or contaminated fluid. 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 Faulty lock-up select solenoid valve, Wiring or connector issues in the circuit, Low transmission fluid level or contaminated fluid.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1740 Nissan Description

The P1740 Nissan code indicates a problem with the lock-up select solenoid valve circuit in the vehicle's transmission system. The lock-up solenoid is responsible for controlling the engagement and disengagement of the torque converter lock-up clutch. When this circuit malfunctions, it can lead to issues with the vehicle's shifting, fuel efficiency, and overall performance. If left unaddressed, this code can potentially cause further damage to the transmission system, resulting in more significant and costly repairs.

OBDII Code P1740 Nissan - Lock-up Select Solenoid Valve Circuit
P1740 Nissan Code - Lock-up Select Solenoid Valve Circuit

Common Causes of P1740 Nissan

  1. Faulty lock-up select solenoid valve
  2. Wiring or connector issues in the circuit
  3. Low transmission fluid level or contaminated fluid
  4. Internal transmission damage
  5. Electronic control module (ECM) malfunction

Symptoms of P1740 Nissan

  1. Erratic shifting or difficulty shifting gears
  2. Slipping or shuddering during acceleration
  3. Decreased fuel efficiency
  4. Illuminated check engine light
  5. Harsh or delayed engagement of the transmission

How to Fix P1740 Nissan

  1. Perform a diagnostic scan to confirm the P1740 code and identify the specific cause of the issue.
  2. Inspect the lock-up select solenoid valve and its wiring for any signs of damage or corrosion.
  3. Check and top up the transmission fluid if necessary, ensuring it is at the correct level and in good condition.
  4. Replace the faulty lock-up select solenoid valve or repair any wiring or connector issues in the circuit.
  5. Clear the trouble code from the vehicle's ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1740 Nissan

The cost of repairing a P1740 Nissan code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. Keep in mind that additional diagnostic time and any necessary transmission fluid flushes may increase the overall cost. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.

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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.

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