P1740 Infiniti Code - Lock-up Select Solenoid Valve Circuit
Quick Answer
The P1740 Infiniti code refers to an issue with the Lock-up Select Solenoid Valve Circuit. Common causes include Faulty solenoid: The most common cause of this code is a malfunctioning lock-up select solenoid valve, This can be due to internal wear and tear, electrical issues, or mechanical failures, Wiring issues: Damage to the wiring harness or connectors connected to the solenoid valve can disrupt the circuit and trigger the P1740 code. 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 Infiniti indicates Lock-up Select Solenoid Valve Circuit.
- Common causes
- Common causes include Faulty solenoid: The most common cause of this code is a malfunctioning lock-up select solenoid valve, This can be due to internal wear and tear, electrical issues, or mechanical failures, Wiring issues: Damage to the wiring harness or connectors connected to the solenoid valve can disrupt the circuit and trigger the P1740 code.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1740 Infiniti Description
The P1740 Infiniti code refers to an issue with the Lock-up Select Solenoid Valve Circuit. This solenoid plays a crucial role in the operation of the vehicle's automatic transmission system. The lock-up solenoid is responsible for engaging and disengaging the torque converter lock-up clutch, which helps improve fuel efficiency and overall performance by reducing slippage in the torque converter.
Common Causes of P1740 Infiniti
- Faulty solenoid: The most common cause of this code is a malfunctioning lock-up select solenoid valve. This can be due to internal wear and tear, electrical issues, or mechanical failures.
- Wiring issues: Damage to the wiring harness or connectors connected to the solenoid valve can disrupt the circuit and trigger the P1740 code.
- Low transmission fluid level: Insufficient transmission fluid or a fluid leak can affect the operation of the solenoid valve, leading to code P1740.
- Internal transmission problems: Issues with other components within the transmission, such as the torque converter or valve body, can indirectly affect the operation of the lock-up solenoid valve.
Symptoms of P1740 Infiniti
- Erratic shifting: One of the most noticeable symptoms of a faulty lock-up select solenoid valve circuit is erratic shifting behavior. This can manifest as harsh or delayed shifting, especially when the vehicle is accelerating or decelerating.
- Decreased fuel efficiency: A malfunctioning solenoid can cause the torque converter lock-up clutch to engage improperly, leading to increased fuel consumption.
- Transmission overheating: The inability of the torque converter to lock up can result in excessive heat buildup in the transmission, potentially causing overheating.
- Illuminated check engine light: The P1740 code will trigger the check engine light to illuminate on the dashboard, indicating a problem with the lock-up solenoid valve circuit.
How to Fix P1740 Infiniti
- Diagnose the issue: The first step in resolving the P1740 code is to conduct a thorough diagnostic inspection to pinpoint the exact cause of the problem. This may involve using a scan tool to retrieve the fault codes and testing the solenoid valve circuit for continuity.
- Test the solenoid: Check the resistance of the lock-up select solenoid valve to determine if it is functioning within the manufacturer's specifications. Replace the solenoid if it fails the resistance test.
- Inspect wiring and connectors: Examine the wiring harness and connectors for any signs of damage or corrosion. Repair or replace any faulty components as needed.
- Check transmission fluid: Ensure that the transmission fluid level is adequate and that it is in good condition. Top up or replace the fluid if necessary.
- Clear codes and test drive: After completing the repairs, clear the fault codes from the vehicle's computer memory and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P1740 Infiniti
The cost of repairing a P1740 Infiniti code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the parts required for this repair, such as a new lock-up select solenoid valve, wiring harness, or transmission fluid, can range from $100 to $300. Labor costs for this repair typically fall between $200 and $500, depending on the shop's hourly rates and the complexity of the repair process. Overall, the total cost of addressing a P1740 code can range from $300 to $800, including parts and labor. It's important to note that prices may differ based on the location, vehicle make and model, and the specific repair shop chosen.
Need more information about the P1740 Infiniti code?
Need more information on how to fix the P1740 Infiniti code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1740 Infiniti code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1740 Infiniti Code
1. What does OBDII code P1740 in an Infiniti mean?
The P1740 code in an Infiniti indicates a problem with the Lock-up Select Solenoid Valve Circuit.
2. What are the common symptoms of a P1740 code in an Infiniti?
Common symptoms of a P1740 code may include harsh shifting, transmission slipping, decreased fuel efficiency, and illuminated Check Engine Light.
3. What are the possible causes of a P1740 code in an Infiniti?
Possible causes of a P1740 code include a faulty lock-up select solenoid valve, damaged wiring or connectors in the circuit, low transmission fluid levels, or internal transmission issues.
4. How can I diagnose a P1740 code in my Infiniti?
Diagnosing a P1740 code typically involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, inspecting the wiring and connectors related to the solenoid valve, and conducting a thorough transmission system test.
5. Can I continue driving my Infiniti with a P1740 code?
It is not recommended to continue driving your Infiniti with a P1740 code, as it can lead to further damage to the transmission. It is advisable to address the issue promptly.
6. How can I repair a P1740 code in my Infiniti?
Repairing a P1740 code may involve replacing the lock-up select solenoid valve, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and addressing any internal transmission problems.
7. Are there any DIY tips for fixing a P1740 code in an Infiniti?
While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, diagnosing and repairing a P1740 code often requires specialized tools and expertise, so it is recommended to consult a professional mechanic.
8. Will resetting the trouble codes make the P1740 code disappear?
Resetting the trouble codes may temporarily clear the P1740 code, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven and the problem is detected again.
9. How much does it cost to fix a P1740 code in an Infiniti?
The cost of fixing a P1740 code in an Infiniti can vary depending on the exact cause of the issue, the parts needed for repair, and labor costs. It is recommended to obtain quotes from different mechanics for an accurate estimate.
10. Can a P1740 code affect the overall performance of my Infiniti?
Yes, a P1740 code can affect the overall performance of your Infiniti by causing transmission issues such as harsh shifting, slipping, and reduced fuel efficiency. Addressing the code promptly can help maintain the performance of your vehicle.
Discuss the causes and fixes for P1740 Infiniti OBDII Code
Code P1740 Infiniti comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.