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P1774 2003 Infiniti G35 Code - Low Coast Brake Solenoid Valve Function

Quick Answer

The P1774 diagnostic trouble code (DTC) for a 2003 Infiniti G35 relates to the Low Coast Brake Solenoid Valve Function. Common causes include Contaminated transmission fluid, Electrical issues with the solenoid valve, Mechanical failure of the 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
P1774 2003 Infiniti G35 indicates Low Coast Brake Solenoid Valve Function.
Common causes
Common causes include Contaminated transmission fluid, Electrical issues with the solenoid valve, Mechanical failure of the 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P1774 2003 Infiniti G35 Description

The P1774 diagnostic trouble code (DTC) for a 2003 Infiniti G35 relates to the Low Coast Brake Solenoid Valve Function. This code indicates a problem with the solenoid valve that controls the operation of the transmission during coasting or deceleration. The solenoid valve is responsible for regulating the hydraulic pressure within the transmission, allowing for smooth shifts and optimal performance.

OBDII Code P1774 2003 Infiniti G35 - Low Coast Brake Solenoid Valve Function
P1774 2003 Infiniti G35 Code - Low Coast Brake Solenoid Valve Function

Common Causes of P1774 2003 Infiniti G35

  1. Contaminated transmission fluid
  2. Electrical issues with the solenoid valve
  3. Mechanical failure of the solenoid valve
  4. Wiring harness or connector problems
  5. Internal transmission damage

Symptoms of P1774 2003 Infiniti G35

  1. Harsh shifting between gears
  2. Delayed or erratic gear changes
  3. Transmission slipping or jerking during deceleration
  4. Transmission fluid leaks
  5. Illumination of the check engine light

How to Fix P1774 2003 Infiniti G35

  1. Begin by diagnosing the specific cause of the P1774 code using a scan tool to read the transmission control module (TCM) data.
  2. Inspect the transmission fluid for signs of contamination or debris. If necessary, perform a transmission fluid flush and filter replacement.
  3. Test the solenoid valve for proper operation using a multimeter to check for continuity and resistance.
  4. Replace the solenoid valve if it is found to be faulty, ensuring proper installation and connection.
  5. Clear the DTC codes from the TCM and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P1774 2003 Infiniti G35

The typical repair costs for addressing a P1774 code on a 2003 Infiniti G35 can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost can vary depending on the specific diagnosis time, labor rates, and parts pricing at different auto repair shops. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable options. It is recommended to obtain quotes from multiple sources to compare prices and ensure a fair repair cost.

What does this mean?

Tech Notes for P1774 2003 Infiniti G35

There is a Factory Service Bulletin for the 2003 Infiniti G35 with 5-Speed A/T RE5R05A Transmission:

2003 Infiniti G35 RE5R05A Transmission Factory Service Bulletin OBDII Code P1774

Need more information about the P1774 2003 Infiniti G35 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 P1774 2003 Infiniti G35 Code

1. What are the common symptoms of OBDII code P1774 in a 2003 Infiniti G35?

- Common symptoms include harsh shifting, delayed shifting, erratic shifting, and in some cases, the vehicle may go into limp mode.

2. What can cause the OBDII code P1774 in a 2003 Infiniti G35?

- The most common cause of this code is a malfunctioning Low Coast Brake Solenoid Valve in the transmission.

3. How can I diagnose the Low Coast Brake Solenoid Valve issue in my 2003 Infiniti G35?

- Diagnosing this issue typically involves checking the wiring and connections to the solenoid valve, as well as performing a resistance test to determine if the solenoid is functioning properly.

4. Can I still drive my Infiniti G35 with the P1774 code present?

- It is not recommended to continue driving the vehicle with the P1774 code present, as it can lead to further damage to the transmission if not addressed promptly.

5. How can I repair the Low Coast Brake Solenoid Valve issue in my 2003 Infiniti G35?

- Repairing the issue may involve replacing the Low Coast Brake Solenoid Valve, as well as addressing any wiring or connection issues that may be contributing to the problem.

6. Will resetting the OBDII code P1774 in my 2003 Infiniti G35 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue with the Low Coast Brake Solenoid Valve is not fixed, the code is likely to return.

7. What are the potential long-term effects of ignoring the OBDII code P1774 in a 2003 Infiniti G35?

- Ignoring the P1774 code can lead to further transmission problems, increased fuel consumption, and ultimately more costly repairs down the line.

8. Can a DIY enthusiast fix the Low Coast Brake Solenoid Valve issue in a 2003 Infiniti G35?

- While some DIY enthusiasts may be able to replace the solenoid valve themselves, it is recommended to have this type of repair done by a professional mechanic with experience in transmission work.

9. How much does it typically cost to repair the Low Coast Brake Solenoid Valve in a 2003 Infiniti G35?

- The cost of repairing the Low Coast Brake Solenoid Valve can vary depending on the mechanic's labor rates and the cost of the replacement part, but it is generally a moderate expense compared to other transmission repairs.

10. Are there any preventive measures I can take to avoid OBDII code P1774 in my 2003 Infiniti G35?

- Regular maintenance, including checking and replacing transmission fluid as needed, can help prevent issues with the Low Coast Brake Solenoid Valve and reduce the likelihood of encountering the P1774 code.

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