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P0745 2004 Infiniti G35 Code - Line Pressure Solenoid Valve Fault

Quick Answer

The P0745 code in a 2004 Infiniti G35 indicates a fault with the Line Pressure Solenoid Valve. Common causes include Faulty Line Pressure Solenoid Valve, Electrical issues such as a short circuit or faulty wiring, Low transmission fluid levels or dirty 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
P0745 2004 Infiniti G35 indicates Line Pressure Solenoid Valve Fault.
Common causes
Common causes include Faulty Line Pressure Solenoid Valve, Electrical issues such as a short circuit or faulty wiring, Low transmission fluid levels or dirty 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 Aug 30, 2024
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Code P0745 2004 Infiniti G35 Description

The P0745 code in a 2004 Infiniti G35 indicates a fault with the Line Pressure Solenoid Valve. This valve is responsible for regulating the hydraulic pressure in the transmission system. When this valve malfunctions, it can lead to issues with shifting gears smoothly, which can result in jerky or delayed gear changes. Additionally, it can cause the transmission to slip, overheat, or fail to engage properly. If left unaddressed, this issue can lead to further damage to the transmission system, resulting in costly repairs.

OBDII Code P0745 2004 Infiniti G35 - Line Pressure Solenoid Valve Fault
P0745 2004 Infiniti G35 Code - Line Pressure Solenoid Valve Fault

Common Causes of P0745 2004 Infiniti G35

  1. Faulty Line Pressure Solenoid Valve
  2. Electrical issues such as a short circuit or faulty wiring
  3. Low transmission fluid levels or dirty fluid
  4. Mechanical damage or wear and tear on the transmission system
  5. Issues with the transmission control module

Symptoms of P0745 2004 Infiniti G35

  1. Delayed or rough shifting between gears
  2. Transmission slipping
  3. Overheating of the transmission
  4. Reduced fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P0745 2004 Infiniti G35

  1. Perform a diagnostic scan to confirm the P0745 code and identify the specific issue with the Line Pressure Solenoid Valve.
  2. Inspect the wiring and connections related to the solenoid valve for any damage or corrosion.
  3. Check the transmission fluid level and quality, topping off or replacing as needed.
  4. Replace the Line Pressure Solenoid Valve if it is found to be faulty.
  5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0745 2004 Infiniti G35

The typical repair costs for a Line Pressure Solenoid Valve fault can range from $200 to $500, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on various factors. It's recommended to check with local repair shops to get a more accurate estimate for your specific vehicle.

What does this mean?

Tech Notes for P0745 2004 Infiniti G35

When a transmission solenoid is malfunctioned, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced.

When is the Code Detected?

The P0745 is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

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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 P0745 2004 Infiniti G35 Code

1. What does the OBDII code P0745 mean for a 2004 Infiniti G35?

P0745 indicates a fault with the Line Pressure Solenoid Valve, which controls hydraulic pressure in the transmission system.

2. What are the common symptoms of code P0745 in a 2004 Infiniti G35?

Symptoms may include harsh or erratic shifting, transmission slippage, poor acceleration, or the vehicle entering limp mode.

3. What causes the P0745 code to appear?

Common causes include a defective line pressure solenoid, wiring issues such as damaged or corroded connectors, low transmission fluid, or internal transmission problems.

4. Can driving with a P0745 code damage my 2004 Infiniti G35?

Yes, driving with this code active can lead to further transmission damage if the issue is not addressed promptly.

5. How do I fix the P0745 code on my Infiniti G35?

Repairs may involve replacing the line pressure solenoid, repairing damaged wiring or connectors, flushing and refilling the transmission fluid, or rebuilding the transmission if internal damage is found.

6. How can I diagnose the P0745 code?

Use an OBDII scanner to confirm the code, inspect the solenoid and its wiring for damage, check transmission fluid levels and condition, and perform a pressure test on the transmission if needed.

7. What is the cost to repair a P0745 code on a 2004 Infiniti G35?

Repair costs can range from $150 to $500 for solenoid or wiring repairs, but internal transmission damage could increase costs significantly.

8. Can low transmission fluid cause the P0745 code?

Yes, low or degraded transmission fluid can cause improper solenoid operation and trigger this code.

9. Is replacing the line pressure solenoid a DIY job for a 2004 Infiniti G35?

Replacing the solenoid can be complex and may require dropping the transmission pan. It is recommended for experienced DIYers or professionals.

10. Will resetting the code clear the P0745 issue on my Infiniti G35?

Resetting the code may temporarily clear it, but the underlying problem must be fixed to prevent the code from returning.

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