P0499 2018 GMC Sierra Code - Evaporative Emission System Vent Valve Control Circuit High
Quick Answer
The Evaporative Emission (EVAP) Vent Solenoid Valve is located on the EVAP canister and is used to seal the canister vent. Common causes include Faulty Evaporative Emission Vent Solenoid Valve, Evaporative Emission Vent Solenoid Valve harness is open or shorted, Evaporative Emission Vent Solenoid Valve electrical circuit poor connection. 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 2018 GMC Sierra indicates Evaporative Emission System Vent Valve Control Circuit High.
- Common causes
- Common causes include Faulty Evaporative Emission Vent Solenoid Valve, Evaporative Emission Vent Solenoid Valve harness is open or shorted, Evaporative Emission Vent Solenoid Valve electrical circuit poor connection.
- 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.
Code P0499 2018 GMC Sierra Description
What are the Possible Causes of the DTC P0499 2018 GMC Sierra?
- Faulty Evaporative Emission Vent Solenoid Valve
- Evaporative Emission Vent Solenoid Valve harness is open or shorted
- Evaporative Emission Vent Solenoid Valve electrical circuit poor connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0499 2018 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0499 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0499 2018 GMC Sierra Code
1. What does the OBDII code P0499 mean on a 2018 GMC Sierra?
P0499 indicates a problem with the evaporative emission (EVAP) system vent valve control circuit, specifically a high voltage issue.
2. What are the common symptoms of code P0499 in a 2018 GMC Sierra?
Symptoms may include an illuminated check engine light, difficulty refueling due to tank pressure issues, or a faint fuel odor near the vehicle.
3. What causes the P0499 code to appear on a 2018 GMC Sierra?
Common causes include a faulty EVAP vent valve, wiring issues (such as damaged or corroded connectors), or a malfunctioning powertrain control module (PCM).
4. Can I drive my 2018 GMC Sierra with the P0499 code?
While it is usually safe to drive, ignoring the issue can lead to reduced fuel efficiency, emission problems, and difficulty passing emissions tests.
5. How do I diagnose the P0499 code on a 2018 GMC Sierra?
Diagnosis involves checking the EVAP vent valve and its wiring for damage, testing the valve's resistance, and using a scan tool to monitor the circuit's behavior.
6. How do you fix the P0499 code on a 2018 GMC Sierra?
Repairs may include replacing the EVAP vent valve, repairing or replacing damaged wiring, or cleaning corroded connectors in the vent valve circuit.
7. What tools are needed to diagnose and repair the P0499 code?
You’ll typically need a scan tool, a multimeter to test electrical connections, and possibly a smoke machine to check for EVAP system leaks.
8. How much does it cost to fix the P0499 code on a 2018 GMC Sierra?
Repair costs can range from $50 to $300, depending on whether the issue is a simple wiring fix or requires replacing the EVAP vent valve.
9. Can a loose gas cap trigger the P0499 code on a 2018 GMC Sierra?
A loose gas cap is unlikely to cause this specific code, but it could trigger other EVAP-related codes. The P0499 code typically points to a vent valve issue.
10. Is the P0499 code covered under warranty for a 2018 GMC Sierra?
If the vehicle is still under warranty, especially the emissions warranty, the repair may be covered. Check with your dealership for details.
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