P0499 2016 GMC Sierra Code - Evaporative Emission System Vent Valve Control Circuit High
Quick Answer
The P0499 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the evaporative emission system vent valve control circuit being detected as high. Common causes include Faulty Vent Valve: The most common cause of this code is a malfunctioning vent valve that is stuck open or closed, causing the control circuit to read high voltage, Wiring Issues: Damaged or corroded wiring in the vent valve control circuit can lead to high voltage readings and trigger the code, Faulty PCM: A problem with the powertrain control module (PCM) that controls the evaporative emission system can also cause the circuit to read high. 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 2016 GMC Sierra indicates Evaporative Emission System Vent Valve Control Circuit High.
- Common causes
- Common causes include Faulty Vent Valve: The most common cause of this code is a malfunctioning vent valve that is stuck open or closed, causing the control circuit to read high voltage, Wiring Issues: Damaged or corroded wiring in the vent valve control circuit can lead to high voltage readings and trigger the code, Faulty PCM: A problem with the powertrain control module (PCM) that controls the evaporative emission system can also cause the circuit to read high.
- 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.
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Code P0499 2016 GMC Sierra Description
The P0499 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the evaporative emission system vent valve control circuit being detected as high. The evaporative emission system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from being released into the atmosphere. The vent valve control circuit is a crucial component that controls the flow of vapors from the fuel tank to the engine intake for combustion.
Common Causes of P0499 2016 GMC Sierra
- Faulty Vent Valve: The most common cause of this code is a malfunctioning vent valve that is stuck open or closed, causing the control circuit to read high voltage.
- Wiring Issues: Damaged or corroded wiring in the vent valve control circuit can lead to high voltage readings and trigger the code.
- Faulty PCM: A problem with the powertrain control module (PCM) that controls the evaporative emission system can also cause the circuit to read high.
- Vacuum Leaks: Any leaks in the vacuum lines connected to the evaporative emission system can disrupt the proper functioning of the vent valve control circuit.
Symptoms of P0499 2016 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Rough Idle: The engine may experience rough idling or hesitation during acceleration due to improper venting of fuel vapors.
- Decreased Fuel Efficiency: A malfunctioning evaporative emission system can lead to decreased fuel efficiency as the engine may not be running optimally.
- Strong Fuel Smell: A strong smell of fuel inside or outside the vehicle can indicate a problem with the evaporative emission system.
How to Fix P0499 2016 GMC Sierra
- Diagnose the Issue: Use a scan tool to read the DTC and perform a thorough inspection of the evaporative emission system components to identify the root cause of the problem.
- Replace Vent Valve: If the vent valve is found to be faulty, replace it with a new one to restore proper venting of fuel vapors.
- Repair Wiring: Inspect and repair any damaged or corroded wiring in the vent valve control circuit to ensure proper voltage readings.
- Check PCM: Verify the functionality of the PCM and replace it if necessary to address any control issues with the evaporative emission system.
- Clear Codes: After completing the repairs, clear the DTC and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P0499 2016 GMC Sierra
The typical repair costs for addressing a P0499 code on a 2016 GMC Sierra can range from $150 to $400, including parts and labor. However, it's important to note that the 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, while independent shops often charge less. It's recommended to obtain a detailed estimate from a local auto repair shop for a more accurate cost assessment.
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