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Engine-Codes – Dodge – P0499 Dodge

P0499 Dodge Code - NVLD Vent Valve Solenoid Circuit High

Quick Answer

The P0499 diagnostic trouble code (DTC) for Dodge vehicles indicates a problem with the NVLD (Natural Vacuum Leak Detection) vent valve solenoid circuit being too high. Common causes include Faulty NVLD Vent Valve Solenoid: The solenoid itself may be defective and require replacement, Wiring Issues: Damage to the wiring harness or electrical connections leading to the solenoid can cause high voltage in the circuit, Vacuum Leaks: Any leaks in the vacuum lines connected to the NVLD system can disrupt its operation. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P0499 Dodge indicates NVLD Vent Valve Solenoid Circuit High.
Common causes
Common causes include Faulty NVLD Vent Valve Solenoid: The solenoid itself may be defective and require replacement, Wiring Issues: Damage to the wiring harness or electrical connections leading to the solenoid can cause high voltage in the circuit, Vacuum Leaks: Any leaks in the vacuum lines connected to the NVLD system can disrupt its operation.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Aug 25, 2024
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Code P0499 Dodge Description

The P0499 diagnostic trouble code (DTC) for Dodge vehicles indicates a problem with the NVLD (Natural Vacuum Leak Detection) vent valve solenoid circuit being too high. The NVLD system is responsible for detecting leaks in the vehicle's evaporative emission control system, which helps reduce harmful emissions. The vent valve solenoid is a crucial component of this system, controlling the flow of fuel vapors from the charcoal canister to the engine intake.

OBDII Code P0499 Dodge - NVLD Vent Valve Solenoid Circuit High
P0499 Dodge Code - NVLD Vent Valve Solenoid Circuit High

Common Causes of P0499 Dodge

  1. Faulty NVLD Vent Valve Solenoid: The solenoid itself may be defective and require replacement.
  2. Wiring Issues: Damage to the wiring harness or electrical connections leading to the solenoid can cause high voltage in the circuit.
  3. Vacuum Leaks: Any leaks in the vacuum lines connected to the NVLD system can disrupt its operation.
  4. ECM Malfunction: A malfunction in the engine control module (ECM) could also trigger this code.
  5. Charcoal Canister Issues: Problems with the charcoal canister or its connections may impact the NVLD system's performance.

Symptoms of P0499 Dodge

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Rough Idle: A malfunctioning NVLD vent valve solenoid can cause irregular idling or engine stalling.
  3. Reduced Fuel Efficiency: The vehicle may experience decreased fuel efficiency due to improper venting of fuel vapors.
  4. Strong Fuel Odor: A strong smell of fuel inside or outside the vehicle could indicate a leak in the evaporative emission system.
  5. Difficulty Starting: The vehicle may have trouble starting if the NVLD vent valve solenoid is not functioning correctly.

How to Fix P0499 Dodge

  1. Diagnose the Issue: Use a scan tool to retrieve the trouble code and perform a thorough inspection of the NVLD system components.
  2. Test the NVLD Vent Valve Solenoid: Check the solenoid for proper operation using a multimeter to measure voltage and resistance.
  3. Inspect Wiring and Connections: Examine the wiring harness and connectors for any damage or corrosion, repairing or replacing as needed.
  4. Replace NVLD Vent Valve Solenoid: If the solenoid is faulty, install a new one following the manufacturer's instructions.
  5. Clear Codes and Test Drive: Clear the DTC from the ECM memory, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0499 Dodge

The cost of repairing a P0499 DTC for a Dodge vehicle can vary depending on the specific model and year, as well as the location of the repair shop. In general, the parts for this repair, including a new NVLD vent valve solenoid, can range from $50 to $150. Labor costs typically average between $100 to $200, with the total repair bill amounting to approximately $150 to $350. It's essential to consult with a trusted mechanic or dealership to obtain an accurate estimate based on your vehicle's needs and local labor rates.

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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 P0499 Dodge Code

1. What does the OBDII code P0499 mean on a Dodge vehicle?

P0499 indicates a "NVLD Vent Valve Solenoid Circuit High," meaning the voltage in the vent valve solenoid circuit is higher than expected, often related to the vehicle's evaporative emissions control system.

2. What are the common symptoms of code P0499 in a Dodge?

Symptoms may include an illuminated check engine light, failed emissions tests, fuel odors near the vehicle, or decreased fuel efficiency.

3. What causes the P0499 code to appear on a Dodge?

Common causes include a faulty NVLD vent valve solenoid, damaged wiring or connectors in the solenoid circuit, a malfunctioning PCM (Powertrain Control Module), or a clogged or stuck valve.

4. How do I diagnose the P0499 code on a Dodge?

Inspect the NVLD vent valve solenoid and its wiring for damage, check for loose or corroded electrical connections, and use a multimeter to test the solenoid's resistance and circuit voltage.

5. Can I drive my Dodge with the P0499 code?

While the vehicle may still be drivable, ignoring the code can lead to increased emissions and potential damage to the EVAP system. It’s best to address the issue promptly.

6. How do I fix the P0499 code on a Dodge?

Repairs may involve replacing a faulty NVLD vent valve solenoid, repairing damaged wiring or connectors, or reprogramming/updating the PCM if necessary.

7. What tools are needed to troubleshoot the P0499 code?

You’ll need an OBDII scanner, a multimeter for electrical testing, and possibly a vacuum pump to test the EVAP system components.

8. How much does it cost to fix the P0499 code on a Dodge?

Repair costs can vary but typically range from $100 to $300, depending on whether the issue is a simple wiring repair or requires replacing the NVLD vent valve solenoid.

9. Can a loose gas cap cause the P0499 code on a Dodge?

A loose gas cap is unlikely to directly trigger P0499, but it can cause other EVAP-related codes. Always check and tighten the gas cap as part of troubleshooting.

10. How can I prevent the P0499 code from recurring on my Dodge?

Regularly inspect the EVAP system components, keep the gas cap tight, and address any check engine light codes promptly to avoid further issues.

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