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P1774 Infiniti Code - Low Coast Brake Solenoid Valve Function

Quick Answer

The P1774 code for Infiniti vehicles refers to an issue with the Low Coast Brake Solenoid Valve function. Common causes include Faulty low coast brake solenoid valve, Electrical issues such as a short circuit or open circuit in the solenoid valve circuit, Low transmission fluid levels or dirty transmission 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
P1774 Infiniti indicates Low Coast Brake Solenoid Valve Function.
Common causes
Common causes include Faulty low coast brake solenoid valve, Electrical issues such as a short circuit or open circuit in the solenoid valve circuit, Low transmission fluid levels or dirty transmission 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 P1774 Infiniti Description

The P1774 code for Infiniti vehicles refers to an issue with the Low Coast Brake Solenoid Valve function. This solenoid valve is responsible for controlling the application of the low coast brake, which is used to assist in the smooth transition between deceleration and coasting while driving. When this solenoid valve malfunctions, it can lead to problems with the vehicle's transmission system, affecting the overall performance and drivability of the vehicle.

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

Common Causes of P1774 Infiniti

  1. Faulty low coast brake solenoid valve
  2. Electrical issues such as a short circuit or open circuit in the solenoid valve circuit
  3. Low transmission fluid levels or dirty transmission fluid
  4. Mechanical issues within the transmission system
  5. Software or programming issues in the vehicle's computer system

Symptoms of P1774 Infiniti

  1. Harsh or delayed shifting between gears
  2. Poor acceleration or loss of power
  3. Transmission slipping or jerking
  4. Illuminated check engine light or transmission warning light
  5. Difficulty engaging or disengaging gears

How to Fix P1774 Infiniti

  1. Begin by diagnosing the specific cause of the P1774 code using a diagnostic scanner to pinpoint the exact issue.
  2. Inspect the low coast brake solenoid valve and its wiring harness for any signs of damage or corrosion.
  3. If the solenoid valve is faulty, replace it with a new one and ensure it is properly calibrated.
  4. Check and refill the transmission fluid to the correct level, or perform a transmission flush if necessary.
  5. Clear the diagnostic trouble codes from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1774 Infiniti

The cost of repairing a P1774 code for the Low Coast Brake Solenoid Valve function in an Infiniti vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. Generally, the parts for this repair can range from $150 to $300, while labor costs can range from $100 to $200. Overall, the total cost for addressing this code typically falls between $250 and $500. It's important to note that prices may differ based on location, vehicle model, and labor rates at the repair facility.

What does this mean?

Tech Notes for P1774 Infiniti

There is a Factory Service Bulletin for all 2003–2010 Infiniti vehicles with 5-Speed A/T RE5R05A Transmission:
2003–2010 Infiniti RE5R05A Transmission Factory Service Bulletin OBDII Code P1774

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Information for Specific Infiniti Models

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 Infiniti Code

1. What are the common symptoms of OBDII code P1774 in an Infiniti related to the Low Coast Brake Solenoid Valve function?

- Common symptoms include harsh shifting, transmission slippage, poor acceleration, and the transmission remaining in a single gear.

2. What typically causes the OBDII code P1774 to trigger in an Infiniti?

- The code P1774 is usually triggered by a malfunction in the Low Coast Brake Solenoid Valve, which is responsible for controlling the transmission's shifting behavior.

3. How can I diagnose the issue causing OBDII code P1774 in my Infiniti related to the Low Coast Brake Solenoid Valve function?

- Diagnosing the issue requires a thorough inspection of the transmission system, checking for any wiring faults, solenoid valve malfunctions, or hydraulic issues.

4. Is it safe to continue driving my Infiniti with OBDII code P1774 related to the Low Coast Brake Solenoid Valve function?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the transmission system and potentially unsafe driving conditions.

5. Can I repair the Low Coast Brake Solenoid Valve issue causing OBDII code P1774 in my Infiniti myself?

- While some DIY enthusiasts may attempt the repair, it is recommended to seek professional help due to the complexity of the transmission system and the precise nature of the repair.

6. How much does it typically cost to repair the Low Coast Brake Solenoid Valve issue causing OBDII code P1774 in an Infiniti?

- Repair costs can vary depending on the extent of the damage and the labor rates of the repair shop, but it can range from a few hundred to over a thousand dollars.

7. Are there any preventive maintenance tips to avoid triggering OBDII code P1774 in an Infiniti related to the Low Coast Brake Solenoid Valve function?

- Regular transmission fluid checks and changes, as well as keeping up with scheduled maintenance, can help prevent issues that may lead to triggering this code.

8. Will resetting the OBDII code P1774 related to the Low Coast Brake Solenoid Valve function 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 addressed, the code is likely to reappear.

9. Can a faulty Low Coast Brake Solenoid Valve affecting OBDII code P1774 cause long-term damage to the transmission of an Infiniti?

- Yes, if left unresolved, a malfunctioning solenoid valve can lead to further damage to the transmission system, potentially resulting in more costly repairs.

10. Is it common for OBDII code P1774 in an Infiniti related to the Low Coast Brake Solenoid Valve function to recur even after repairs?

- If the root cause of the issue is not properly addressed during repairs, there is a possibility of the code recurring. It is crucial to ensure the repair is done correctly to prevent this.

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