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P1400 Subaru Code - Fuel Tank Pressure Control Solenoid Low Input

Quick Answer

The P1400 Subaru code indicates a low input signal from the fuel tank pressure control solenoid. Common causes include Faulty Solenoid: The most common cause of this code is a malfunctioning fuel tank pressure control solenoid, Wiring Issues: Damage to the wiring or connectors connected to the solenoid can also trigger this code, Vacuum Leaks: Any leaks in the vacuum lines connected to the solenoid can disrupt the pressure control system. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P1400 Subaru indicates Fuel Tank Pressure Control Solenoid Low Input.
Common causes
Common causes include Faulty Solenoid: The most common cause of this code is a malfunctioning fuel tank pressure control solenoid, Wiring Issues: Damage to the wiring or connectors connected to the solenoid can also trigger this code, Vacuum Leaks: Any leaks in the vacuum lines connected to the solenoid can disrupt the pressure control system.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P1400 Subaru Description

The P1400 Subaru code indicates a low input signal from the fuel tank pressure control solenoid. This solenoid is responsible for controlling the pressure in the fuel tank, ensuring that it remains within the specified range. When the input signal is low, it can lead to issues with the fuel system, affecting the vehicle's performance and emissions.

OBDII Code P1400 Subaru - Fuel Tank Pressure Control Solenoid Low Input
P1400 Subaru Code - Fuel Tank Pressure Control Solenoid Low Input

Common Causes of P1400 Subaru

  1. Faulty Solenoid: The most common cause of this code is a malfunctioning fuel tank pressure control solenoid.
  2. Wiring Issues: Damage to the wiring or connectors connected to the solenoid can also trigger this code.
  3. Vacuum Leaks: Any leaks in the vacuum lines connected to the solenoid can disrupt the pressure control system.
  4. Evaporative Emissions System Leak: A leak in the evaporative emissions system can also lead to a low input signal from the solenoid.

Symptoms of P1400 Subaru

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Rough Idle: The engine may experience rough idling or stalling due to improper fuel pressure control.
  3. Fuel Smell: A strong smell of gasoline inside or outside the vehicle can indicate a leak or pressure issue in the fuel system.
  4. Failed Emissions Test: If the fuel tank pressure control solenoid is not functioning correctly, it can lead to failed emissions tests.

How to Fix P1400 Subaru

  1. Diagnose the Issue: Use a diagnostic tool to retrieve the specific error code and identify the root cause of the problem.
  2. Inspect Solenoid: Check the fuel tank pressure control solenoid for any signs of damage or malfunction and replace if necessary.
  3. Check Wiring: Inspect the wiring and connectors for any damage or corrosion, and repair or replace as needed.
  4. Test Vacuum System: Check the vacuum lines for leaks and ensure they are properly connected to the solenoid.
  5. Clear Error Codes: After completing the repairs, clear the error codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1400 Subaru

The cost of repairing a P1400 Subaru code can vary depending on the extent of the issue and the specific repairs needed. On average, the cost of parts for a fuel tank pressure control solenoid replacement can range from $100 to $200, while labor costs can range from $100 to $200 as well. Overall, the total repair cost for this issue may fall between $200 and $400. However, it is important to note that labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate.

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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 P1400 Subaru Code

1. What does the OBDII code P1400 mean on a Subaru?

P1400 refers to a "Fuel Tank Pressure Control Solenoid Low Input," indicating an issue with the solenoid responsible for regulating fuel tank pressure.

2. What are the common symptoms of code P1400 in a Subaru?

Symptoms may include a check engine light, poor fuel efficiency, difficulty starting the vehicle, or a noticeable fuel odor.

3. What causes the P1400 code in a Subaru?

Common causes include a faulty fuel tank pressure control solenoid, damaged wiring or connectors, or issues with the engine control module (ECM).

4. Can a loose gas cap trigger the P1400 code?

No, a loose gas cap typically triggers an evaporative system leak code (e.g., P0456). P1400 specifically relates to the pressure control solenoid.

5. How do you diagnose a P1400 code on a Subaru?

Diagnosis involves checking the fuel tank pressure control solenoid, inspecting wiring and connectors for damage, and using a multimeter to verify proper voltage and continuity.

6. Can I drive my Subaru with a P1400 code?

While the car may still be drivable, it’s best to address the issue promptly to avoid potential emissions-related problems and performance issues.

7. How is the P1400 code repaired on a Subaru?

Repairs may include replacing the fuel tank pressure control solenoid, repairing damaged wiring, or updating/reprogramming the ECM if necessary.

8. What tools are needed to fix a P1400 code?

You’ll need an OBDII scanner, a multimeter, and basic tools for accessing and replacing components in the fuel tank system.

9. Is the P1400 code related to the EVAP system?

Yes, the P1400 code is connected to the EVAP system, as the fuel tank pressure control solenoid is part of the system's pressure regulation.

10. How much does it cost to fix a P1400 code on a Subaru?

Repair costs vary but typically range from $100 to $300, depending on whether the solenoid, wiring, or ECM requires attention.

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