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P1665 GMC Code - EVAP Vent Solenoid Control Circuit Conditions

Quick Answer

The P1665 GMC code indicates a problem with the EVAP (Evaporative Emission Control System) vent solenoid control circuit. Common causes include Faulty EVAP vent solenoid, Wiring issues in the control circuit, Malfunctioning PCM. 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
P1665 GMC indicates EVAP Vent Solenoid Control Circuit Conditions.
Common causes
Common causes include Faulty EVAP vent solenoid, Wiring issues in the control circuit, Malfunctioning PCM.
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 10, 2024
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Code P1665 GMC Description

The P1665 GMC code indicates a problem with the EVAP (Evaporative Emission Control System) vent solenoid control circuit. The EVAP system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. The vent solenoid controls the flow of vapors into the engine to be burned off. When this code is triggered, it means that the control circuit for the vent solenoid is experiencing abnormal conditions.

OBDII Code P1665 GMC - EVAP Vent Solenoid Control Circuit Conditions
P1665 GMC Code - EVAP Vent Solenoid Control Circuit Conditions

Common Causes of P1665 GMC

  1. Faulty EVAP vent solenoid
  2. Wiring issues in the control circuit
  3. Malfunctioning PCM
  4. Vacuum leak in the EVAP system
  5. Corrosion or damage to electrical connections

Symptoms of P1665 GMC

  1. Check engine light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Failed emissions tests
  4. Strong fuel odor near the vehicle
  5. Rough idling or stalling

How to Fix P1665 GMC

  1. Begin by diagnosing the specific cause of the P1665 code using a scan tool to check for fault codes and testing the EVAP system components.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the EVAP vent solenoid to determine if it is functioning correctly. Replace if faulty.
  4. Check for vacuum leaks in the EVAP system and repair as needed.
  5. Clear the fault codes and reset the check engine light after completing the repairs.

Cost to Fix P1665 GMC

The typical repair costs for addressing the P1665 GMC code can range from $150 to $400, including parts and labor. However, it is essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships and lower at independent shops. To get a more accurate estimate, it is advisable to check local rates before proceeding with the repair.

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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 P1665 GMC Code

1. What does the OBDII code P1665 mean on a GMC vehicle?

P1665 indicates an issue with the EVAP Vent Solenoid Control Circuit, which is part of the vehicle's evaporative emissions control system.

2. What are the common symptoms of the P1665 code?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, difficulty refueling, or a faint fuel odor near the vehicle.

3. What causes the P1665 code to appear?

Common causes include a faulty EVAP vent solenoid, damaged wiring or connectors in the circuit, or a malfunctioning powertrain control module (PCM).

4. Can a loose gas cap trigger the P1665 code on a GMC?

No, a loose gas cap typically triggers different codes related to the EVAP system, but not P1665, which specifically pertains to the vent solenoid circuit.

5. How do I diagnose the P1665 code?

Start by inspecting the EVAP vent solenoid wiring and connectors for damage or corrosion, then test the solenoid itself for proper operation using a multimeter or scanner.

6. Is it safe to drive with the P1665 code active?

While it may not cause immediate damage, driving with this code can lead to increased emissions and potential long-term issues with the EVAP system.

7. How do I fix the P1665 code on my GMC?

Repairs may involve replacing the EVAP vent solenoid, repairing damaged wiring, or addressing PCM-related issues if the circuit is functioning properly.

8. How much does it cost to repair a P1665 code?

The cost varies, but replacing the EVAP vent solenoid typically ranges from $100 to $300, including parts and labor.

9. Can the P1665 code clear itself after repairs?

The code might clear after resolving the issue, but you may need to manually reset it using an OBDII scanner or by completing a drive cycle.

10. What tools are needed to diagnose and fix the P1665 code?

You'll need an OBDII scanner, a multimeter to test the circuit, and basic hand tools to inspect or replace components.

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